DESCRIPTION grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given PATTERN. By default, grep prints the matching lines.
DESCRIPTION The su command is used to become another user during a login session. Invoked without a username, su defaults to becoming the superuser. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly.
Additional arguments may be provided after the username, in which case they are supplied to the user´s... Continue reading ...
DESCRIPTION This manual page documents the GNU version of rm. rm removes each specified file. By default, it does not remove directories.
If the -I or --interactive=once option is given, and there are more than three files or the -r, -R, or --recursive are given, then rm prompts the user for whether to proceed with the entire operation. If the response is not affirmative, the ... Continue reading ...
DESCRIPTION Write lines consisting of the sequentially corresponding lines from each FILE, separated by TABs, to standard out‐ put. With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
-d, --delimiters=LIST reuse characters from LIST instead of TABs