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Created by voodoo on February 16, 2012 14:56:44    Last update: February 16, 2012 15:52:56
Shell functions are declared using this syntax: [ function ] name () compound-command [ redirectio... Example: function ll { ls -alF $* } Example 2: ll() { ls -alF $* } Shell functions can be exported to subshells with the -f switch: $ export -f ll However , I had problems logging in Ubuntu 11.10 after I added this to .profile : export -f ll
Created by Dr. Xi on September 29, 2008 23:21:38    Last update: January 16, 2010 23:36:05
Create a startup script for inetd Copy /etc/init.d/skeleton to /etc/init.d/inetd . Change the top section of the script to read: PATH=/usr/sbin:/usr/bin:/sbin:/bin DESC="In... Now inetd can be stopped/started/restarted like this: sudo /etc/init.d/inetd stop sudo /etc/init.... Add links to rc*.d $ sudo update-rc.d inetd defaults Adding sy... If you no longer need to start inetd at boot up: $ sudo update-rc.d -f inetd remove update-r... This would remove the links from the start up sequence but leave /etc/init.d/inetd in place. Contents of /etc/init.d/skeleton : #! /bin/sh ### BEGIN INIT INFO # Provide...
Created by Dr. Xi on September 29, 2008 23:05:12    Last update: September 29, 2008 23:06:16
These variables are set or used by the Unix shell to modify its behavior. Variable Description ENV=file Name of script that gets executed at startup; Usually, ENV=$HOME/.kshrc FCEDIT=file Editor used by fc (fix command) command. If $FCEDIT is not defined, use $EDITOR, otherwise use the default (vi or ed). FPATH=dirs Directories to search for function definitions; undefined functions are set via typeset -fu . FPATH is searched when these functions are first referenced. HISTFILE=file File in which to store command history. Default is $HOME/.sh_history for Korn shell, $HOME/.bash_history for Bash. If not set, history is lost after logout. HISTSIZE=n Max number of commands to keep in history. HOME=dir Home directory; set by login from passwd file. IFS='chars' Internal field separators. Default is space, tab, and...
Created by Dr. Xi on September 29, 2008 23:03:40    Last update: September 29, 2008 23:04:08
Variables set automatically by shell: Variable Description $# Number of command-line arguments. $- Options currently in effect (arguments supplied to sh or to set). $? Exit value of last executed command. $$ Process number of current process. $! Process number of last background command. $0 First word; that is, command name. $n Individual arguments on command line (positional parameters). The Bourne shell allows only nine parameters to be referenced directly (n = 1-9); the Korn shell allows n to be greater than 9 if specified as ${n}. $* All arguments on command line ("$1 $2..."). $@ All arguments on command line, individually quoted ("$1" "$2" ...). Variables set automatically by Korn shell: Variable Description ERRNO Error number of last system call that failed. LINENO Current...
Created by Dr. Xi on December 12, 2007 20:30:01    Last update: December 12, 2007 20:32:23
This is a script to tail a log file through the web browser. It uses AJAX, apache web server, mod_python, UNIX utilities tail (requires the --lines switch) and wc . The log file may reside on the web server or any other host accessible from the web server through SSH. Although it's written in python, it should be easy to port to other languages such as Perl. Apache httpd.conf : LoadModule python_module modules/mod_python.so ... Python script: import time, os from os.path import basename ...