# Filesystem

`Base.Filesystem.pwd` — Function

    pwd() -> AbstractString

Get the current working directory.

Examples

    julia> pwd()
    "/home/JuliaUser"

    julia> cd("/home/JuliaUser/Projects/julia")

    julia> pwd()
    "/home/JuliaUser/Projects/julia"

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`Base.Filesystem.cd` — Method

    cd(dir::AbstractString=homedir())

Set the current working directory.

Examples

    julia> cd("/home/JuliaUser/Projects/julia")

    julia> pwd()
    "/home/JuliaUser/Projects/julia"

    julia> cd()

    julia> pwd()
    "/home/JuliaUser"

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`Base.Filesystem.cd` — Method

    cd(f::Function, dir::AbstractString=homedir())

Temporarily change the current working directory to `dir`, apply function `f` and finally return to the original directory.

Examples

    julia> pwd()
    "/home/JuliaUser"

    julia> cd(readdir, "/home/JuliaUser/Projects/julia")
    34-element Array{String,1}:
     ".circleci"
     ".freebsdci.sh"
     ".git"
     ".gitattributes"
     ".github"
     ⋮
     "test"
     "ui"
     "usr"
     "usr-staging"

    julia> pwd()
    "/home/JuliaUser"

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`Base.Filesystem.readdir` — Function

    readdir(dir::AbstractString=pwd();
        join::Bool = false,
        sort::Bool = true,
    ) -> Vector{String}

Return the names in the directory `dir` or the current working directory if not given. When `join` is false, `readdir` returns just the names in the directory as is; when `join` is true, it returns `joinpath(dir, name)` for each `name` so that the returned strings are full paths. If you want to get absolute paths back, call `readdir` with an absolute directory path and `join` set to true.

By default, `readdir` sorts the list of names it returns. If you want to skip sorting the names and get them in the order that the file system lists them, you can use `readdir(dir, sort=false)` to opt out of sorting.

Julia 1.4

The `join` and `sort` keyword arguments require at least Julia 1.4.

Examples

    julia> cd("/home/JuliaUser/dev/julia")

    julia> readdir()
    30-element Array{String,1}:
     ".appveyor.yml"
     ".git"
     ".gitattributes"
     ⋮
     "ui"
     "usr"
     "usr-staging"

    julia> readdir(join=true)
    30-element Array{String,1}:
     "/home/JuliaUser/dev/julia/.appveyor.yml"
     "/home/JuliaUser/dev/julia/.git"
     "/home/JuliaUser/dev/julia/.gitattributes"
     ⋮
     "/home/JuliaUser/dev/julia/ui"
     "/home/JuliaUser/dev/julia/usr"
     "/home/JuliaUser/dev/julia/usr-staging"

    julia> readdir("base")
    145-element Array{String,1}:
     ".gitignore"
     "Base.jl"
     "Enums.jl"
     ⋮
     "version_git.sh"
     "views.jl"
     "weakkeydict.jl"

    julia> readdir("base", join=true)
    145-element Array{String,1}:
     "base/.gitignore"
     "base/Base.jl"
     "base/Enums.jl"
     ⋮
     "base/version_git.sh"
     "base/views.jl"
     "base/weakkeydict.jl"```

    julia> readdir(abspath("base"), join=true)
    145-element Array{String,1}:
     "/home/JuliaUser/dev/julia/base/.gitignore"
     "/home/JuliaUser/dev/julia/base/Base.jl"
     "/home/JuliaUser/dev/julia/base/Enums.jl"
     ⋮
     "/home/JuliaUser/dev/julia/base/version_git.sh"
     "/home/JuliaUser/dev/julia/base/views.jl"
     "/home/JuliaUser/dev/julia/base/weakkeydict.jl"

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`Base.Filesystem.walkdir` — Function

    walkdir(dir; topdown=true, follow_symlinks=false, onerror=throw)

Return an iterator that walks the directory tree of a directory. The iterator returns a tuple containing `(rootpath, dirs, files)`. The directory tree can be traversed top-down or bottom-up. If `walkdir` or `stat` encounters a `IOError` it will rethrow the error by default. A custom error handling function can be provided through `onerror` keyword argument. `onerror` is called with a `IOError` as argument.

Examples

    for (root, dirs, files) in walkdir(".")
        println("Directories in $root")
        for dir in dirs
            println(joinpath(root, dir)) # path to directories
        end
        println("Files in $root")
        for file in files
            println(joinpath(root, file)) # path to files
        end
    end

    julia> mkpath("my/test/dir");

    julia> itr = walkdir("my");

    julia> (root, dirs, files) = first(itr)
    ("my", ["test"], String[])

    julia> (root, dirs, files) = first(itr)
    ("my/test", ["dir"], String[])

    julia> (root, dirs, files) = first(itr)
    ("my/test/dir", String[], String[])

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`Base.Filesystem.mkdir` — Function

    mkdir(path::AbstractString; mode::Unsigned = 0o777)

Make a new directory with name `path` and permissions `mode`. `mode` defaults to `0o777`, modified by the current file creation mask. This function never creates more than one directory. If the directory already exists, or some intermediate directories do not exist, this function throws an error. See `mkpath` for a function which creates all required intermediate directories. Return `path`.

Examples

    julia> mkdir("testingdir")
    "testingdir"

    julia> cd("testingdir")

    julia> pwd()
    "/home/JuliaUser/testingdir"

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`Base.Filesystem.mkpath` — Function

    mkpath(path::AbstractString; mode::Unsigned = 0o777)

Create all directories in the given `path`, with permissions `mode`. `mode` defaults to `0o777`, modified by the current file creation mask. Unlike `mkdir`, `mkpath` does not error if `path` (or parts of it) already exists. Return `path`.

Examples

    julia> mkdir("testingdir")
    "testingdir"

    julia> cd("testingdir")

    julia> pwd()
    "/home/JuliaUser/testingdir"

    julia> mkpath("my/test/dir")
    "my/test/dir"

    julia> readdir()
    1-element Array{String,1}:
     "my"

    julia> cd("my")

    julia> readdir()
    1-element Array{String,1}:
     "test"

    julia> readdir("test")
    1-element Array{String,1}:
     "dir"

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`Base.Filesystem.symlink` — Function

    symlink(target::AbstractString, link::AbstractString; dir_target = false)

Creates a symbolic link to `target` with the name `link`.

On Windows, symlinks must be explicitly declared as referring to a directory or not. If `target` already exists, by default the type of `link` will be auto- detected, however if `target` does not exist, this function defaults to creating a file symlink unless `dir_target` is set to `true`. Note that if the user sets `dir_target` but `target` exists and is a file, a directory symlink will still be created, but dereferencing the symlink will fail, just as if the user creates a file symlink (by calling `symlink()` with `dir_target` set to `false` before the directory is created) and tries to dereference it to a directory.

Additionally, there are two methods of making a link on Windows; symbolic links and junction points. Junction points are slightly more efficient, but do not support relative paths, so if a relative directory symlink is requested (as denoted by `isabspath(target)` returning `false`) a symlink will be used, else a junction point will be used. Best practice for creating symlinks on Windows is to create them only after the files/directories they reference are already created.

Note

This function raises an error under operating systems that do not support soft symbolic links, such as Windows XP.

Julia 1.6

The `dir_target` keyword argument was added in Julia 1.6. Prior to this, symlinks to nonexistant paths on windows would always be file symlinks, and relative symlinks to directories were not supported.

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`Base.Filesystem.readlink` — Function

    readlink(path::AbstractString) -> AbstractString

Return the target location a symbolic link `path` points to.

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`Base.Filesystem.chmod` — Function

    chmod(path::AbstractString, mode::Integer; recursive::Bool=false)

Change the permissions mode of `path` to `mode`. Only integer `mode`s (e.g. `0o777`) are currently supported. If `recursive=true` and the path is a directory all permissions in that directory will be recursively changed. Return `path`.

Note

Prior to Julia 1.6, this did not correctly manipulate filesystem ACLs on Windows, therefore it would only set read-only bits on files. It now is able to manipulate ACLs.

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`Base.Filesystem.chown` — Function

    chown(path::AbstractString, owner::Integer, group::Integer=-1)

Change the owner and/or group of `path` to `owner` and/or `group`. If the value entered for `owner` or `group` is `-1` the corresponding ID will not change. Only integer `owner`s and `group`s are currently supported. Return `path`.

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`Base.Libc.RawFD` — Type

    RawFD

Primitive type which wraps the native OS file descriptor. `RawFD`s can be passed to methods like `stat` to discover information about the underlying file, and can also be used to open streams, with the `RawFD` describing the OS file backing the stream.

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`Base.stat` — Function

    stat(file)

Returns a structure whose fields contain information about the file. The fields of the structure are:

Name | Description
--- | ---
size | The size (in bytes) of the file
device | ID of the device that contains the file
inode | The inode number of the file
mode | The protection mode of the file
nlink | The number of hard links to the file
uid | The user id of the owner of the file
gid | The group id of the file owner
rdev | If this file refers to a device, the ID of the device it refers to
blksize | The file-system preferred block size for the file
blocks | The number of such blocks allocated
mtime | Unix timestamp of when the file was last modified
ctime | Unix timestamp of when the file was created

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`Base.Filesystem.lstat` — Function

    lstat(file)

Like `stat`, but for symbolic links gets the info for the link itself rather than the file it refers to. This function must be called on a file path rather than a file object or a file descriptor.

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`Base.Filesystem.ctime` — Function

    ctime(file)

Equivalent to `stat(file).ctime`.

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`Base.Filesystem.mtime` — Function

    mtime(file)

Equivalent to `stat(file).mtime`.

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`Base.Filesystem.filemode` — Function

    filemode(file)

Equivalent to `stat(file).mode`.

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`Base.filesize` — Function

    filesize(path...)

Equivalent to `stat(file).size`.

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`Base.Filesystem.uperm` — Function

    uperm(file)

Get the permissions of the owner of the file as a bitfield of

Value | Description
--- | ---
01 | Execute Permission
02 | Write Permission
04 | Read Permission

For allowed arguments, see `stat`.

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`Base.Filesystem.gperm` — Function

    gperm(file)

Like `uperm` but gets the permissions of the group owning the file.

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`Base.Filesystem.operm` — Function

    operm(file)

Like `uperm` but gets the permissions for people who neither own the file nor are a member of the group owning the file

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`Base.Filesystem.cp` — Function

    cp(src::AbstractString, dst::AbstractString; force::Bool=false, follow_symlinks::Bool=false)

Copy the file, link, or directory from `src` to `dst`. `force=true` will first remove an existing `dst`.

If `follow_symlinks=false`, and `src` is a symbolic link, `dst` will be created as a symbolic link. If `follow_symlinks=true` and `src` is a symbolic link, `dst` will be a copy of the file or directory `src` refers to. Return `dst`.

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`Base.download` — Function

    download(url::AbstractString, [path::AbstractString = tempname()]) -> path

Download a file from the given url, saving it to the location `path`, or if not specified, a temporary path. Returns the path of the downloaded file.

Note

Since Julia 1.6, this function is deprecated and is just a thin wrapper around `Downloads.download`. In new code, you should use that function directly instead of calling this.

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`Base.Filesystem.mv` — Function

    mv(src::AbstractString, dst::AbstractString; force::Bool=false)

Move the file, link, or directory from `src` to `dst`. `force=true` will first remove an existing `dst`. Return `dst`.

Examples

    julia> write("hello.txt", "world");

    julia> mv("hello.txt", "goodbye.txt")
    "goodbye.txt"

    julia> "hello.txt" in readdir()
    false

    julia> readline("goodbye.txt")
    "world"

    julia> write("hello.txt", "world2");

    julia> mv("hello.txt", "goodbye.txt")
    ERROR: ArgumentError: 'goodbye.txt' exists. `force=true` is required to remove 'goodbye.txt' before moving.
    Stacktrace:
     [1] #checkfor_mv_cp_cptree#10(::Bool, ::Function, ::String, ::String, ::String) at ./file.jl:293
    [...]

    julia> mv("hello.txt", "goodbye.txt", force=true)
    "goodbye.txt"

    julia> rm("goodbye.txt");

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`Base.Filesystem.rm` — Function

    rm(path::AbstractString; force::Bool=false, recursive::Bool=false)

Delete the file, link, or empty directory at the given path. If `force=true` is passed, a non-existing path is not treated as error. If `recursive=true` is passed and the path is a directory, then all contents are removed recursively.

Examples

    julia> mkpath("my/test/dir");

    julia> rm("my", recursive=true)

    julia> rm("this_file_does_not_exist", force=true)

    julia> rm("this_file_does_not_exist")
    ERROR: IOError: unlink("this_file_does_not_exist"): no such file or directory (ENOENT)
    Stacktrace:
    [...]

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`Base.Filesystem.touch` — Function

    touch(path::AbstractString)

Update the last-modified timestamp on a file to the current time.

If the file does not exist a new file is created.

Return `path`.

Examples

    julia> write("my_little_file", 2);

    julia> mtime("my_little_file")
    1.5273815391135583e9

    julia> touch("my_little_file");

    julia> mtime("my_little_file")
    1.527381559163435e9

We can see the `mtime` has been modified by `touch`.

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`Base.Filesystem.tempname` — Function

    tempname(parent=tempdir(); cleanup=true) -> String

Generate a temporary file path. This function only returns a path; no file is created. The path is likely to be unique, but this cannot be guaranteed due to the very remote posibility of two simultaneous calls to `tempname` generating the same file name. The name is guaranteed to differ from all files already existing at the time of the call to `tempname`.

When called with no arguments, the temporary name will be an absolute path to a temporary name in the system temporary directory as given by `tempdir()`. If a `parent` directory argument is given, the temporary path will be in that directory instead.

The `cleanup` option controls whether the process attempts to delete the returned path automatically when the process exits. Note that the `tempname` function does not create any file or directory at the returned location, so there is nothing to cleanup unless you create a file or directory there. If you do and `clean` is `true` it will be deleted upon process termination.

Julia 1.4

The `parent` and `cleanup` arguments were added in 1.4. Prior to Julia 1.4 the path `tempname` would never be cleaned up at process termination.

Warning

This can lead to security holes if another process obtains the same file name and creates the file before you are able to. Open the file with `JL_O_EXCL` if this is a concern. Using `mktemp()` is also recommended instead.

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`Base.Filesystem.tempdir` — Function

    tempdir()

Gets the path of the temporary directory. On Windows, `tempdir()` uses the first environment variable found in the ordered list `TMP`, `TEMP`, `USERPROFILE`. On all other operating systems, `tempdir()` uses the first environment variable found in the ordered list `TMPDIR`, `TMP`, `TEMP`, and `TEMPDIR`. If none of these are found, the path `"/tmp"` is used.

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`Base.Filesystem.mktemp` — Method

    mktemp(parent=tempdir(); cleanup=true) -> (path, io)

Return `(path, io)`, where `path` is the path of a new temporary file in `parent` and `io` is an open file object for this path. The `cleanup` option controls whether the temporary file is automatically deleted when the process exits.

Julia 1.3

The `cleanup` keyword argument was added in Julia 1.3. Relatedly, starting from 1.3, Julia will remove the temporary paths created by `mktemp` when the Julia process exits, unless `cleanup` is explicitly set to `false`.

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`Base.Filesystem.mktemp` — Method

    mktemp(f::Function, parent=tempdir())

Apply the function `f` to the result of `mktemp(parent)` and remove the temporary file upon completion.

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`Base.Filesystem.mktempdir` — Method

    mktempdir(parent=tempdir(); prefix="jl_", cleanup=true) -> path

Create a temporary directory in the `parent` directory with a name constructed from the given prefix and a random suffix, and return its path. Additionally, any trailing `X` characters may be replaced with random characters. If `parent` does not exist, throw an error. The `cleanup` option controls whether the temporary directory is automatically deleted when the process exits.

Julia 1.2

The `prefix` keyword argument was added in Julia 1.2.

Julia 1.3

The `cleanup` keyword argument was added in Julia 1.3. Relatedly, starting from 1.3, Julia will remove the temporary paths created by `mktempdir` when the Julia process exits, unless `cleanup` is explicitly set to `false`.

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`Base.Filesystem.mktempdir` — Method

    mktempdir(f::Function, parent=tempdir(); prefix="jl_")

Apply the function `f` to the result of `mktempdir(parent; prefix)` and remove the temporary directory all of its contents upon completion.

Julia 1.2

The `prefix` keyword argument was added in Julia 1.2.

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`Base.Filesystem.isblockdev` — Function

    isblockdev(path) -> Bool

Return `true` if `path` is a block device, `false` otherwise.

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`Base.Filesystem.ischardev` — Function

    ischardev(path) -> Bool

Return `true` if `path` is a character device, `false` otherwise.

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`Base.Filesystem.isdir` — Function

    isdir(path) -> Bool

Return `true` if `path` is a directory, `false` otherwise.

Examples

    julia> isdir(homedir())
    true

    julia> isdir("not/a/directory")
    false

See also: `isfile` and `ispath`.

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`Base.Filesystem.isfifo` — Function

    isfifo(path) -> Bool

Return `true` if `path` is a FIFO, `false` otherwise.

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`Base.Filesystem.isfile` — Function

    isfile(path) -> Bool

Return `true` if `path` is a regular file, `false` otherwise.

Examples

    julia> isfile(homedir())
    false

    julia> f = open("test_file.txt", "w");

    julia> isfile(f)
    true

    julia> close(f); rm("test_file.txt")

See also: `isdir` and `ispath`.

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`Base.Filesystem.islink` — Function

    islink(path) -> Bool

Return `true` if `path` is a symbolic link, `false` otherwise.

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`Base.Filesystem.ismount` — Function

    ismount(path) -> Bool

Return `true` if `path` is a mount point, `false` otherwise.

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`Base.Filesystem.ispath` — Function

    ispath(path) -> Bool

Return `true` if a valid filesystem entity exists at `path`, otherwise returns `false`. This is the generalization of `isfile`, `isdir` etc.

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`Base.Filesystem.issetgid` — Function

    issetgid(path) -> Bool

Return `true` if `path` has the setgid flag set, `false` otherwise.

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`Base.Filesystem.issetuid` — Function

    issetuid(path) -> Bool

Return `true` if `path` has the setuid flag set, `false` otherwise.

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`Base.Filesystem.issocket` — Function

    issocket(path) -> Bool

Return `true` if `path` is a socket, `false` otherwise.

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`Base.Filesystem.issticky` — Function

    issticky(path) -> Bool

Return `true` if `path` has the sticky bit set, `false` otherwise.

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`Base.Filesystem.homedir` — Function

    homedir() -> String

Return the current user's home directory.

Note

`homedir` determines the home directory via `libuv`'s `uv_os_homedir`. For details (for example on how to specify the home directory via environment variables), see the `uv_os_homedir` documentation.

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`Base.Filesystem.dirname` — Function

    dirname(path::AbstractString) -> AbstractString

Get the directory part of a path. Trailing characters ('/' or '\') in the path are counted as part of the path.

Examples

    julia> dirname("/home/myuser")
    "/home"

    julia> dirname("/home/myuser/")
    "/home/myuser"

See also: `basename`

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`Base.Filesystem.basename` — Function

    basename(path::AbstractString) -> AbstractString

Get the file name part of a path.

Note

This function differs slightly from the Unix `basename` program, where trailing slashes are ignored, i.e. `$ basename /foo/bar/` returns `bar`, whereas `basename` in Julia returns an empty string `""`.

Examples

    julia> basename("/home/myuser/example.jl")
    "example.jl"

    julia> basename("/home/myuser/")
    ""

See also: `dirname`

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`Base.Filesystem.isabspath` — Function

    isabspath(path::AbstractString) -> Bool

Determine whether a path is absolute (begins at the root directory).

Examples

    julia> isabspath("/home")
    true

    julia> isabspath("home")
    false

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`Base.Filesystem.isdirpath` — Function

    isdirpath(path::AbstractString) -> Bool

Determine whether a path refers to a directory (for example, ends with a path separator).

Examples

    julia> isdirpath("/home")
    false

    julia> isdirpath("/home/")
    true

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`Base.Filesystem.joinpath` — Function

    joinpath(parts::AbstractString...) -> String

Join path components into a full path. If some argument is an absolute path or (on Windows) has a drive specification that doesn't match the drive computed for the join of the preceding paths, then prior components are dropped.

Note on Windows since there is a current directory for each drive, `joinpath("c:", "foo")` represents a path relative to the current directory on drive "c:" so this is equal to "c:foo", not "c:\foo". Furthermore, `joinpath` treats this as a non-absolute path and ignores the drive letter casing, hence `joinpath("C:\A","c:b") = "C:\A\b"`.

Examples

    julia> joinpath("/home/myuser", "example.jl")
    "/home/myuser/example.jl"

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`Base.Filesystem.abspath` — Function

    abspath(path::AbstractString) -> String

Convert a path to an absolute path by adding the current directory if necessary. Also normalizes the path as in `normpath`.

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    abspath(path::AbstractString, paths::AbstractString...) -> String

Convert a set of paths to an absolute path by joining them together and adding the current directory if necessary. Equivalent to `abspath(joinpath(path, paths...))`.

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`Base.Filesystem.normpath` — Function

    normpath(path::AbstractString) -> String

Normalize a path, removing "." and ".." entries.

Examples

    julia> normpath("/home/myuser/../example.jl")
    "/home/example.jl"

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    normpath(path::AbstractString, paths::AbstractString...) -> String

Convert a set of paths to a normalized path by joining them together and removing "." and ".." entries. Equivalent to `normpath(joinpath(path, paths...))`.

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`Base.Filesystem.realpath` — Function

    realpath(path::AbstractString) -> String

Canonicalize a path by expanding symbolic links and removing "." and ".." entries. On case-insensitive case-preserving filesystems (typically Mac and Windows), the filesystem's stored case for the path is returned.

(This function throws an exception if `path` does not exist in the filesystem.)

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`Base.Filesystem.relpath` — Function

    relpath(path::AbstractString, startpath::AbstractString = ".") -> AbstractString

Return a relative filepath to `path` either from the current directory or from an optional start directory. This is a path computation: the filesystem is not accessed to confirm the existence or nature of `path` or `startpath`.

On Windows, case sensitivity is applied to every part of the path except drive letters. If `path` and `startpath` refer to different drives, the absolute path of `path` is returned.

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`Base.Filesystem.expanduser` — Function

    expanduser(path::AbstractString) -> AbstractString

On Unix systems, replace a tilde character at the start of a path with the current user's home directory.

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`Base.Filesystem.splitdir` — Function

    splitdir(path::AbstractString) -> (AbstractString, AbstractString)

Split a path into a tuple of the directory name and file name.

Examples

    julia> splitdir("/home/myuser")
    ("/home", "myuser")

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`Base.Filesystem.splitdrive` — Function

    splitdrive(path::AbstractString) -> (AbstractString, AbstractString)

On Windows, split a path into the drive letter part and the path part. On Unix systems, the first component is always the empty string.

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`Base.Filesystem.splitext` — Function

    splitext(path::AbstractString) -> (AbstractString, AbstractString)

If the last component of a path contains a dot, split the path into everything before the dot and everything including and after the dot. Otherwise, return a tuple of the argument unmodified and the empty string. "splitext" is short for "split extension".

Examples

    julia> splitext("/home/myuser/example.jl")
    ("/home/myuser/example", ".jl")

    julia> splitext("/home/myuser/example")
    ("/home/myuser/example", "")

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`Base.Filesystem.splitpath` — Function

    splitpath(path::AbstractString) -> Vector{String}

Split a file path into all its path components. This is the opposite of `joinpath`. Returns an array of substrings, one for each directory or file in the path, including the root directory if present.

Julia 1.1

This function requires at least Julia 1.1.

Examples

    julia> splitpath("/home/myuser/example.jl")
    4-element Vector{String}:
     "/"
     "home"
     "myuser"
     "example.jl"

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Theme

This document was generated with Documenter.jl on Wednesday 24 March 2021. Using Julia version 1.6.0.