os

Module os provides a platform-independent interface to operating system functionality.

By default, this module interacts with the host operating system normally by calling the underlying Go os package. However, alternative OS abstraction layers may be used via the Go WithOS (opens in a new tab) function. This assists with sandboxing scripts and providing access to object storage like AWS S3 via a filesystem-like interface.

Attributes

stdin

stdin is an open file pointing to the standard input for the process.

Example

>>> os.stdin.read()
byte_slice("hello world")

stdout

stdout is an open file pointing to the standard output for the process.

Example

>>> os.stdout.write("hello world")
11

Functions

chdir

Function signature

chdir(dir string)

Changes the working directory to dir.

Example

>>> os.chdir("/tmp")
>>> os.getwd()
"/tmp"

create

Function signature

create(name string) File

Creates or truncates the named file.

Example

>>> f := os.create("foo.txt")
>>> f.write("hello world")
11
>>> f.close()

environ

Function signature

environ() list

Returns a copy of strings representing the environment, in the form "key=value".

Example

>>> os.environ()
["TERM=xterm-256color", "SHELL=/bin/bash", "USER=alice", ...]

exit

Function signature

exit(code int)

Terminates the program with the given exit code.

Example

>>> os.exit(0)

getenv

Function signature

getenv(key string) string

Returns the value of the environment variable key.

Example

>>> os.getenv("USER")
"alice"

getpid

Function signature

getpid() int

Returns the current process ID.

Example

>>> os.getpid()
1234

getuid

Function signature

getuid() int

Returns the current user ID.

Example

>>> os.getuid()
501

getwd

Function signature

getwd() string

Returns the current working directory.

Example

>>> os.getwd()
"/home/alice"

hostname

Function signature

hostname() string

Returns the host name reported by the kernel.

Example

>>> os.hostname()
"alice-macbook-pro-1.local"

mkdir_all

Function signature

mkdir_all(path string, perm int)

Creates a directory named path, along with any necessary parent directories.

Example

>>> os.mkdir_all("/tmp/foo/bar", 0755)

mkdir_temp

Function signature

mkdir_temp(dir, prefix string) string

Creates a new temporary directory in the directory dir, using prefix to generate its name.

Example

>>> os.mkdir_temp("/tmp", "foo")
"/tmp/foo4103914411"

mkdir

Function signature

mkdir(path string, perm int)

Creates a new directory with the specified name and permission bits. If a permissions value is not specified, 0755 is used.

Example

>>> os.mkdir("/tmp/foo", 0755)

open

Function signature

open(name string) File

Opens the named file.

Example

>>> f := os.open("foo.txt")
>>> f.read()
byte_slice("hello world")
>>> f.close()

read_dir

Function signature

read_dir(name string) list

Returns a list of directory entries sorted by filename. If a name is not specified, the current directory is used.

Example

>>> os.read_dir("/tmp")
[dir_entry(name=foo.txt, type=regular), dir_entry(name=bar.txt, type=regular)]

read_file

Function signature

read_file(name string) byte_slice

Reads the named file and returns its contents.

Example

>>> os.read_file("/tmp/foo.txt")
byte_slice("hello world")

remove

Function signature

remove(name string)

Removes the named file or empty directory.

Example

>>> os.remove("/tmp/old/junk.txt")

remove_all

Function signature

remove_all(name string)

Removes path and any children it contains.

Example

>>> os.remove_all("/tmp/junk")

rename

Function signature

rename(old, new string)

Renames (moves) old to new.

Example

>>> os.rename("old.txt", "new.txt")

setenv

Function signature

setenv(key, value string)

Sets the value of the environment variable key to value.

Example

>>> os.setenv("USER", "bob")
>>> os.getenv("USER")
"bob"

stat

Function signature

stat(name string) FileInfo

Returns a FileInfo describing the named file.

Example

>>> os.stat("example.txt")
file_info(name=example.txt, mode=-rw-r--r--, size=84, mod_time=2023-08-06T08:45:56-04:00)

symlink

Function signature

symlink(old, new string)

Creates a symbolic link new pointing to old.

Example

>>> os.symlink("foo.txt", "bar.txt")

temp_dir

Function signature

temp_dir() string

Returns the default directory to use for temporary files.

Example

>>> os.temp_dir()
"/tmp"

unsetenv

Function signature

unsetenv(key string)

Unsets the environment variable key.

Example

>>> os.unsetenv("USER")
>>> os.getenv("USER")
""

user_cache_dir

Function signature

user_cache_dir() string

Returns the default root directory to use for user-specific non-essential data.

Example

>>> os.user_cache_dir()
"/home/alice/.cache"

user_config_dir

Function signature

user_config_dir() string

Returns the default root directory to use for user-specific configuration data.

Example

>>> os.user_config_dir()
"/home/alice/.config"

user_home_dir

Function signature

user_home_dir() string

Returns the current user's home directory.

Example

>>> os.user_home_dir()
"/home/alice"

write_file

Function signature

write_file(name string, data byte_slice / string)

Writes the given byte_slice or string to the named file.

Example

>>> os.write_file("example.txt", "hey!")
>>> os.read_file("example.txt")
byte_slice("hey!")

math pgx