Shell scripts

• Shell scripts allow you to automate things. I actually don't know shell scripting very well; if I need to do anything complicated, I tend to use Perl, which can call the operating system easily.
• Here's one way to loop through files in a directory and do something to each file (this uses the C shell). Place script code like that below in a file, e.g. loop.csh, make sure loop.csh is executable (>chmod guo+x loop.csh) and then run it: >loop.csh 
  foreach name (`ls *.dat`) 
     echo "`basename $name .dat`" 
     perl tmp.pl < $name 
  end
  • foreach name ( `ls knots*` ) 
       set name2="$name.e.g.10" 
       mv $name $name2 
    end