====== Useful bash commands ======

== Upper case to lower case ==

   for i in *; do mv $i `echo $i | tr [:upper:] [:lower:]`; done

== Recursively remove files ==
  
   rm `find . -type f -name "*~"`
   
== Print column x to column y ==

   gawk '{i=1; while (i<=50){print $i; i++}}' dummy.dat