undos Code

• Be sure to read the makedosCode posting and fix the ^M in this script the same way.

• Copy/paste the code below into the undos script:

  #!/bin/bash
  
  for f in $*
  do
      dir=`dirname $f`
      mkdir -p $dir/sv
      if [ ! -d $dir/sv ]
      then
          echo "cannot backup to $dir/sv"
          exit 1
      fi
  
      cp $f $dir/sv
     
      cat $f | tr -d '^M' > $f.sv
      mv $f.sv $f
  
      chmod 755 $f
  
  done
  

• Once you have both scripts use them to play around and check with the file and wc commands.

• Some things to think about and discuss on Piazza:

  1. What are the 2 basic commands each script uses?

  2. Other than being the inverse of each other, what are the 2 major differences in how these 2 scripts are designed and implemented? In other words, how do their algorithms differ?