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du takes a single argument, specifying a pathname for du to work; if it is not specified, the current directory is used. The SUS mandates for du the following options: -a, In addition to the default output, include information for each non-directory entry-c, display a grand total of the disk usage found by the other arguments
du: Shows disk usage on file systems echo: Displays a specified line of text env: Displays and modifies environment variables: expr: Evaluates expressions factor: Factors numbers: false: Does nothing, but exits unsuccessfully groups: Prints the groups of which the user is a member hostid: Prints the numeric identifier for the current host id
du: Filesystem Mandatory Estimate file space usage Version 1 AT&T UNIX echo: Shell programming Mandatory Write arguments to standard output Version 2 AT&T UNIX ed: Text processing Mandatory The standard text editor PDP-7 UNIX env: Misc Mandatory Set the environment for command invocation System III ex: Text processing Optional (UP) Text editor ...
The GNU core utilities support long options as parameters to the commands, as well as the relaxed convention allowing options even after the regular arguments (unless the POSIXLY_CORRECT environment variable is set). This environment variable enables a different functionality in BSD.
The -n option makes the program sort according to numerical value. The du command produces output that starts with a number, the file size, so its output can be piped to sort to produce a list of files sorted by (ascending) file size: $
In Unix-like systems, the ASCII hyphen-minus begins options; the new (and GNU) convention is to use two hyphens then a word (e.g. --create) to identify the option's use while the old convention (and still available as an option for frequently-used options) is to use one hyphen then one letter (e.g., -c); if one hyphen is followed by two or more ...
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Yes (various internal features involving the date, by using the %F strftime format [18] and the -i option for the fc builtin [19]) Yes Yes (fds up to 9) [20] Yes (via variables, options, functions, styles, etc.) Yes (system and user's zshenv, zprofile, zshrc, zlogin, zlogout) Yes (Unix feature) Yes Yes ash: POSIX: sh 1989 Yes Minix, BusyBox ...