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  Linux shell scripts


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

sort by the most recently added or updated script


Admin


      bkernel   v1.2   build linux kernels 2.2.xx and 2.4.xx
      lowspace   v1.5   notify when space on a device is less then n Megabytes
      lowswap   v1.3   notify when free swap memory is less then n Megabytes
      monproc   v1.1   monitor processies; print when specified processies are or not running
      progsv   v1.3   list version numbers of important programs installed

Compress


      unpack2dir   v1.2   unpack zip, tar, tgz, tar.gz, tar.bz2, tar.z to a dir of the same name as archive prefix
      zipfile   v1.1   zip a single file

Desktop


      xbreak   v1.1   display an X window message when it's time to take a break
      xmesg   v1.1   display an X window message on a regular basis

File


      cpfound   v1.2   recursively find files and copy to a specified dir
      cpverify   v1.3   verify that copied or burned files have been written error free
      crfilen   v1.0   create a file n bytes large
      filesize   v1.2   print sum of the actual size of files
      fnchars   v1.0   print name of file if it has more then n chars in its name
      neatname   v1.3   neatly rename files
      samesize   v1.0   list files of same size in current dir
      sfiles   v1.1   recursively search files for strings; list found files in sorted order
      subspace   v1.4   substitute space in a file and dir name with an _

Graphics


      2bmp   v1.1   convert image file to bmp format
      2jpg   v1.4   convert image file to jpg format
      2png   v1.3   convert image file to png format
      pngoptim   v1.0   reduce the size of a PNG file if possible
      resizeimg   v1.2   resize bitmap image

Misc


      loggedin   v1.1   notify when a particular user has logged in
      loggedout   v1.1   notify when a particular user has logged out
      obfsh   v1.2   shell script obfuscator
      rotcmd   v1.0   rotate commands listed in a file if file execution has been interrupted
      sman   v1.0   search man page for a string, highlight found strings
      srfc   v1.1   search local rfc file for a string, highlight found strings

Network


      bytetraf   v1.0   display network traffic on an interface
      killppp   v1.0   kill ppp pid after n time of no traffic

Security


      rootkitwr   v1.0   chkrootkit wrapper; designed to run at regular intervals

System


      timelykill   v1.0   kill process pid after n time
      whichbin   v1.0   show links and path to executable

Text


      insertext   v1.1   insert text file into another file at line n
      longl   v1.0   print name of the file that contains lines longer then n chars
      pdf2txt   v1.0   convert pdf file to ascii text; write the converted file to disk
      ps2txt   v1.0   convert ps file to ascii text; write the converted file to disk
      rmblanks   v1.2   remove empty or blank lines from an ascii file; replace the original file
      rmdups   v1.0   remove duplicate lines from file or stdin
      rmleads   v1.1   remove empty leading spaces from an ascii file; replace input file
      rmlines   v1.0   remove lines that contain words stored in a list
      word2txt   v1.0   display ms word doc file in ascii format
      wraptext   v1.0   wrap text file at 80th column; replace file with the wrapped version

WWW


      emailadext   v1.0   extract email addresses from file or stdin
      html2txt   v1.1   convert html file to ascii text; write the converted file to disk
      htmloptim   v1.2   optimize html file by reducing its size
      okurl   v1.0   validate a list of urls for their existence
      urlext   v1.2   extract url addresses 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