if test $# -ne 1
then
   echo "wrong number of args: $0 flags[-l][-u] "
   return
fi

if test $1 = "-l"
then
    tr "[A-Z]" "[a-z]" < file1
elif test $1 = "-u"
then
    tr "[a-z]" "[A-Z]" < file1
else
    echo "wrong options: [-l][-u]"
fi

#!/bin/sh
# Muthukumar
# Script to change name from upper to lower / lower to upper
# <usage> [lower | upper]

if [[ $# -ne 1 ]]
then
  echo "Usage: $0 [lower|upper]"
  exit 1
fi

for file in `find . -type f`
do
  if [[ "$1" = "lower" ]]
  then
    mv $file $(echo $file | tr [[:upper:]] [[:lower:]])
  elif [[ "$1" = "upper" ]]
  then
    mv $file $(echo $file | tr [[:lower:]] [[:upper:]])
  else
    echo "Unknown option $1. Use upper | lower"
    exit 1
  fi
done

exit 0
## END ##