====== Полезное ======

  * [[http://wiki.bash-hackers.org| Правильная справка по bash.]]
  * [[http://www.regexplanet.com/simple/index.html| Быстро протестировать regex.]]

Execute commands simultaneously on multiple servers :
  * [[http://www.ubuntugeek.com/execute-commands-simultaneously-on-multiple-servers-using-psshcluster-sshmultixterm.html| Using PSSH/Cluster SSH/Multixterm]] 
  * [[http://www.cyberciti.biz/tips/execute-commands-on-multiple-hosts-using-expect-tool-part-iii.html| using expect tool]]