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• 06.17.10
  Bash, aliases, and command line arguements Code, SysAdmin | (0)

  I was recently doing some work with gzip'd files. It got kind of repetitive to keep typing gunzip file head file gzip file I know there is a zcat but I don't want to have to type zcat file | head everytime. You can create aliases in your .bashrc file. These are quick shortcut commands. The following does not work alias zhead='zcat $1 | head' #does NOT work In order for this to work you have to create a function in your .bashrc and call it from the alias. function zh(){ zcat $1 | head } alias zhead='zh'

  Tagged: alias, bash, gz, zcat
  
• 02.11.10
  10 Quick Tips Code | (0)

  I would not agree that these are usage habits, or even unix specific. But they are nifty. Make directory trees in a single swipe. Change the path; do not move the archive. Combine your commands with control operators. Quote variables with caution. Use escape sequences to manage long input. Group your commands together in a list. Use xargs outside of find . Know when grep should do the counting -- and when it should step aside. Match certain fields in output, not just lines. Stop piping cats. http://www.ibm.com/developerworks/aix/library/au-badunixhabits.html?ca=lnxw01GoodUnixHabits

  Tagged: bash, commandline, linux
  
• 01.28.10
  Which shell do you use? Computers | (0)

  We had a discussion at work today about which shell everyone uses.Everyone has their preferences. There are quiet a few to choose from: sh, bash, zsh, csh, tcsh, and ksh to name just a few. I use BASH and I don't have a reason better than it's the default and I have gotten used to it. One feature I love is sudo !! #this will repeat your previous command as root Which do you use and why?

  Tagged: bash, linux, shell
  
• 01.27.10
  Send mail from commandline Code | (0)

  Need to test postfix? Just send out a quick email? echo "test" | mail -s "test" who@domain.tld

  Tagged: bash, email, postfix
  
• 01.27.10
  Recursively add directories and files to CVS Code | (0)

  found @ vafer.org find . -type d -print | grep -v CVS | xargs cvs add find . -type f -print | grep -v CVS | xargs cvs add

  Tagged: bash, cvs
  
• 01.21.10
  I can never remember… Code | (0)

  There are some Linux commands that I can never for the life of me remember. Maybe documenting them here will give me a place to come back to when I find myself at a loss. Deleting files using find: find . -mtime +3 -exec rm -rf {} \; #dl all files in cur dir that have not been mod in 3 days Test for a null string in bash? if [ -z $VAR ]; then #returns true if the string is empty if [ -n $VAR]; then #returns true if the string is NOT empty if [ $VAR ]; then #returns true is variable exists

  Tagged: bash, linux
  

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