Show or ignore duplicate rows.

Convert file's whitespace characters to tabs

Used to decompress .Z files

Decompress the compressed package created by the arj command

Print system information.

Remove aliases set by alias

Used to unmount a mounted file system

Displays or sets the permission mask for creating files.

Controlling the resources of shell programs

Displays the type of the specified command.

Displays the file name of the terminal device connected to the current standard input.

The return status is success.