Filesystem

pwd() → AbstractString

Get the current working directory.

cd(dir::AbstractString=homedir())

Set the current working directory.

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

Temporarily changes the current working directory and applies function f before returning.

readdir(dir::AbstractString=".") → Vector{String}

Returns the files and directories in the directory dir (or the current working directory if not given).

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

The walkdir method returns 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 encounters a SystemError it will rethrow the error by default. A custom error handling function can be provided through onerror keyword argument. onerror is called with a SystemError as argument.

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
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.

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.

Creates a symbolic link to target with the name link.

Note

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

Returns the target location a symbolic link path points to.

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

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

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 owners and groups are currently supported.

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
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.

ctime(file)

Equivalent to stat(file).ctime

mtime(file)

Equivalent to stat(file).mtime.

filemode(file)

Equivalent to stat(file).mode

filesize(path...)

Equivalent to stat(file).size.

uperm(file)

Gets 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().

gperm(file)

Like uperm() but gets the permissions of the group owning the file.

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

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

Copy the file, link, or directory from src to dest. remove_destination=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.

download(url::AbstractString[, localfile::AbstractString])

Download a file from the given url, optionally renaming it to the given local file name. Note that this function relies on the availability of external tools such as curl, wget or fetch to download the file and is provided for convenience. For production use or situations in which more options are needed, please use a package that provides the desired functionality instead.

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

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

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.

touch(path::AbstractString)

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

tempname()

Generate a unique temporary file path.

tempdir()

Obtain the path of a temporary directory (possibly shared with other processes).

mktemp(parent=tempdir())

Returns (path, io), where path is the path of a new temporary file in parent and io is an open file object for this path.

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

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

mktempdir(parent=tempdir())

Create a temporary directory in the parent directory and return its path.

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

Apply the function f to the result of mktempdir(parent) and remove the temporary directory upon completion.

isblockdev(path) → Bool

Returns true if path is a block device, false otherwise.

ischardev(path) → Bool

Returns true if path is a character device, false otherwise.

isdir(path) → Bool

Returns true if path is a directory, false otherwise.

isfifo(path) → Bool

Returns true if path is a FIFO, false otherwise.

isfile(path) → Bool

Returns true if path is a regular file, false otherwise.

Returns true if path is a symbolic link, false otherwise.

ismount(path) → Bool

Returns true if path is a mount point, false otherwise.

ispath(path) → Bool

Returns true if path is a valid filesystem path, false otherwise.

issetgid(path) → Bool

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

issetuid(path) → Bool

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

issocket(path) → Bool

Returns true if path is a socket, false otherwise.

issticky(path) → Bool

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

homedir() → AbstractString

Return the current user’s home directory.

dirname(path::AbstractString) → AbstractString

Get the directory part of a path.

julia> dirname("/home/myuser")
"/home"
basename(path::AbstractString) → AbstractString

Get the file name part of a path.

julia> basename("/home/myuser/example.jl")
"example.jl"
@__FILE__() → AbstractString

@__FILE__ expands to a string with the absolute file path of the file containing the macro. Returns nothing if run from a REPL or an empty string if evaluated by julia -e <expr>. Alternatively see PROGRAM_FILE.

@__DIR__() → AbstractString

@__DIR__ expands to a string with the directory part of the absolute path of the file containing the macro. Returns nothing if run from a REPL or an empty string if evaluated by julia -e <expr>.

@__LINE__() → Int

@__LINE__ expands to the line number of the call-site.

isabspath(path::AbstractString) → Bool

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

julia> isabspath("/home")
true

julia> isabspath("home")
false
isdirpath(path::AbstractString) → Bool

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

julia> isdirpath("/home")
false

julia> isdirpath("/home/")
true
joinpath(parts...) → AbstractString

Join path components into a full path. If some argument is an absolute path, then prior components are dropped.

julia> joinpath("/home/myuser","example.jl")
"/home/myuser/example.jl"
abspath(path::AbstractString) → AbstractString

Convert a path to an absolute path by adding the current directory if necessary.

normpath(path::AbstractString) → AbstractString

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

julia> normpath("/home/myuser/../example.jl")
"/home/example.jl"
realpath(path::AbstractString) → AbstractString

Canonicalize a path by expanding symbolic links and removing ”.” and ”..” entries.

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.

expanduser(path::AbstractString) → AbstractString

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

splitdir(path::AbstractString) → (AbstractString, AbstractString)

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

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

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.

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

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