Renaming Files in Linux

Type the following on commandline of a bash shell and change the logic as needed.

for i in `ls /home/ssinghal` ; do mv "$i" "$i.new" ; done

Getopts with bash




#!/bin/sh

usage()
{
      echo "Usage: $0 -a all -b ball -c -d -e";
      exit 1;
}

if [ $# -lt 1 ] ; then
      usage;
fi

# ":" decides which options require an argument
# In the example below options "a" and "b" will require a value to be passed along
while getopts a:b:cde opt
do
      case "$opt" in
              a) echo "hello $OPTARG";;
              b) echo "hello $OPTARG";;
              c) echo "c is selected";;
              d) echo "d is selected";;
              e) echo "e is selected";;
              \?) usage;;
      esac
done