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Top Forums Shell Programming and Scripting Basic use of who, cut, grep and pipes?? Post 302597860 by cylus99 on Sunday 12th of February 2012 04:09:33 PM
Old 02-12-2012
Basic use of who, cut, grep and pipes??

Hi, I'm new to shell scripting and i'm trying to write code which contains exactly three pipe commands (e.g. A | B | C) to return a list of the users currently logged into the system. I've been told three useful commands i could use are who, grep and cut. I know 'who' return a list of the users logged in with some information about them and a combination of the other two might be able to extract the exact user name. Can anyone help me out? Thanks.
 

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aptsh(1)						      General Commands Manual							  aptsh(1)

NAME
Aptsh - interactive APT shell SYNOPSIS
aptsh {install pkg | remove pkg | update | ... } [-?, --help] [-c, --config-file configuration_file ] [-s, --storing] [-v, --version] [-x, --execute aptsh_command ] DESCRIPTION
Aptsh is a tool which makes using APT much easier. It gives you an interactive shell with all those sweet features like tab-completion (which you can use to complete name of a package), simpler access to apt commands and easier package searching (ls, rls). Although it's not necessary, it just tries to make life easier. Other way of using Aptsh is using it as a normal command-line tool, a replacement for apt-* commands. USAGE
We'll try to do some ordinary administration tasks - install/remove/search few packages. As a root, type 'aptsh' and press return. Then type 'ins', and press Tab - 'ins' should change into 'install' followed by a whitespace. Now write down 'kde', and press Tab twice - if you're using Debian or other large distro, it should ask you whether you want to see all packages which begin with 'kde'. As you should have noticed - it works exactly like a good shell. You can also play with 'remove' - then aptsh will prompt only installed packages. And remember, that you can pipe results of commands (ie. dump | grep ^Package | cut -d -f 2 | grep ^kde ). You can execute a normal shell command by preceding it with ".". COMMANDS
Aptsh commands: dump-cfg Dump all aptsh options. dpkg Query dpkg. ls Search for packages by matching names to a wildcard. Remember that in some enviroments you have to put the expression between " " or preced special chars with . rls Search for packages by matching names to a regular expression. Read note about special chars above! whatis Display a short description of a package. whichpkg Find the package that supplies the given command or file. listfiles List all files owned by a package. news Obtain the latest news about the package from Debian servers changelog Retrieve latest changelog for the package from Debian servers toupgrade List packages with newer versions available for upgrading ` Change mode. queue-commit Commit stored commands. User answers to all prompts. queue-commit-say Commit commands kept in command queue, automatically answering to all prompts. It should be followed by the answer, if not, it answers (then usually program's behaviour is default). Proper usage of commit-say would be "commit-say y" - then Aptsh answers 'y' to all prompts. queue Display currently stored commands. queue-remove Remove stored commands from list. It should be followed by list or section of numbers of items to remove. Proper usage of this command would be: "commit-remove 1 3 10-15 21" - it will remove items numbered as 1, 3, 10, 11, 12, 13, 14, 15, 21. You can use alias 'last' which refers to the last item. queue-clear Clear list of stored commands orphans Find orphaned libraries on your system. orphans-all Find all orphaned packages on your system, not only libraries. It's output is other than the orphans' one - it's splitted into two columns, first one contains packages' Section, second Name. help Executes 'man aptsh', or displays short info about commands (if any were given as arguments). help-howto Displays HOWTO. You can pipe it to a browser ("more" or "less") or grep it. quit Erm... quit? :) apt-get querying commands (see man apt-get): install update upgrade dselect-upgrade dist-upgrade remove purge (same as remove --purge ) source build-dep check clean autoclean apt-cache querying commands (see man apt-cache): show dump add showpkg stats showsrc dumpavail unmet search depends rdepends pkgnames dotty policy madison AUTHOR
Marcin Wrochniak (wrochniak@gmail.com) version 0.0.6 20 Mar 2005 aptsh(1)
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