Linux shell scripts, Bash scripting, shell programming

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Here is a collection of various shell scripts I wrote over the years to ease the administration of my systems and help with much webmaster work. They are all Linux shell scripts and need the Bash shell and GNU commands to run (standard on any Linux system). Some, or much, tweaking may be needed to make them work on other Unix systems. To avoid that install the Bash shell and GNU commands. Each script has an -h flag for usage explanation. All scripts are released under the GPL license. You can download all scripts in a compressed tar archive (which also includes an FAQ): dm-scripts-1.13.tar.bz2

Most recent update: 11 Mar 2011

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2010-07-02 xmesg v1.1 display an X window message on a regular basis
2010-07-02 xbreak v1.1 display an X window message when it's time to take a break
2010-01-02 progsv v1.3 list version numbers of important programs installed
2006-09-07 cpfound v1.2 recursively find files and copy to a specified dir
2006-02-03 unpack2dir v1.2 unpack zip, tar, tgz, tar.gz, tar.bz2, tar.z to a dir of the same name as archive prefix
2006-01-29 htmloptim v1.2 optimize html file by reducing its size
2005-07-20 rmblanks v1.2 remove empty or blank lines from an ascii file; replace the original file
2005-07-20 rmleads v1.1 remove empty leading spaces from an ascii file; replace input file
2005-06-15 neatname v1.3 neatly rename files
2005-05-02 samesize v1.0 list files of same size in current dir
2005-03-30 insertext v1.1 insert text file into another file at line n
2005-03-03 ps2txt v1.0 convert ps file to ascii text; write the converted file to disk
2005-03-03 html2txt v1.1 convert html file to ascii text; write the converted file to disk
2005-03-03 pdf2txt v1.0 convert pdf file to ascii text; write the converted file to disk
2005-02-28 timelykill v1.0 kill process pid after n time
2005-02-28 killppp v1.0 kill ppp pid after n time of no traffic
2005-02-28 lowspace v1.5 notify when space on a device is less then n Megabytes
2005-02-28 monproc v1.1 monitor processies; print when specified processies are or not running
2005-02-14 sfiles v1.1 recursively search files for strings; list found files in sorted order
2004-12-30 pngoptim v1.0 reduce the size of a PNG file if possible
2004-12-27 srfc v1.1 search local rfc file for a string, highlight found strings
2004-12-23 zipfile v1.1 zip a single file
2004-12-23 cpverify v1.3 verify that copied or burned files have been written error free
2004-12-16 bytetraf v1.0 display network traffic on an interface
2004-10-02 resizeimg v1.2 resize bitmap image
2004-09-20 lowswap v1.3 notify when free swap memory is less then n Megabytes
2004-08-09 obfsh v1.2 shell script obfuscator
2004-07-22 word2txt v1.0 display ms word doc file in ascii format
2004-07-11 sman v1.0 search man page for a string, highlight found strings
2004-07-11 whichbin v1.0 show links and path to executable
2004-07-08 2bmp v1.1 convert image file to bmp format
2004-06-25 emailadext v1.0 extract email addresses from file or stdin
2004-06-22 okurl v1.0 validate a list of urls for their existence
2004-06-22 2png v1.3 convert image file to png format
2004-06-22 2jpg v1.4 convert image file to jpg format
2004-06-21 wraptext v1.0 wrap text file at 80th column; replace file with the wrapped version
2004-06-21 longl v1.0 print name of the file that contains lines longer then n chars
2004-06-21 rmlines v1.0 remove lines that contain words stored in a list
2004-06-14 fnchars v1.0 print name of file if it has more then n chars in its name
2004-06-14 crfilen v1.0 create a file n bytes large
2004-05-21 urlext v1.2 extract url addresses from file or stdin
2004-05-12 rootkitwr v1.0 chkrootkit wrapper; designed to run at regular intervals
2004-04-21 loggedout v1.1 notify when a particular user has logged out
2004-04-21 loggedin v1.1 notify when a particular user has logged in
2004-04-12 rotcmd v1.0 rotate commands listed in a file if file execution has been interrupted
2004-02-15 filesize v1.2 print sum of the actual size of files
2004-02-08 subspace v1.4 substitute space in a file and dir name with an _
2003-11-12 bkernel v1.2 build linux kernels 2.2.xx and 2.4.xx
2002-04-25 rmdups v1.0 remove duplicate lines from file or stdin


Sometimes I get asked if I can recommend any good shell scripting books. These are the ones I found to be the most helpful:


"The tools we use have a profound (and devious!) influence on our thinking habits, and, therefore, on our thinking abilities." -- Edsger Dijkstra