shell script

kv_kumaravel · 05-16-2005, 09:26 AM

hi
i need a shell program for reversing a string and check is it palindrome or not.

bye
:tisk:

keefaz · 05-16-2005, 09:37 AM

For the first part, try :

Code:

echo "Hello, here" | rev

freakyg · 05-16-2005, 10:27 AM

Code:

 #!/bin/bash

# specify palindrome possibility

if [ $# -eq 0 ] ; then
  echo Usage: $0 possible palindrome >&2
  exit 1
fi

testit="$(echo $@ | sed 's/[^[:alpha:]]//g' | tr '[:upper:]' '[:lower:]')"
backwards="$(echo $testit | rev)"

if [ "$testit" = "$backwards" ] ; then
  echo "$@ is a palindrome"
else
  echo "$@ is not a palindrome"
fi

exit 0

jonaskoelker · 05-17-2005, 06:21 PM

why not just

Code:

$ test $(echo "$mystring") = $(echo "$mystring" | rev)

--Jonas

mohit dhawan · 05-18-2005, 12:45 PM

if u pass the arguments thrrough cmd line then
loop using for and store them in x
eg:- for y in $@
x= "$y" "$x"
and then chek it with ur $@