expr - evaluate expressions

To add two numbers $ expr 11 + 5

To subtract two numbers $ expr 20 - 10

To divide two numbers $ expr 20 / 4

To divide two numbers and want to see the remainder $ expr 25 % 6

To multiply two numbers $ expr 6 * 4

To find the length of a string $ expr length indianlinuxusergroupchennai

To check the index of character x $ a=kanchilinuxusergroup $ b=`expr index $a x` $ echo $b

To extract the substring $ a=indianlinuxusergroupchennai $ b=`expr substr $a 21 27` $ echo $b

To get the index of a substring from a string $ expr substr indianlinuxusergroupchennai 21 27

To compare two expressions $ a=50 $ b=60 $ c=`expr $a = $b` $ echo $c

To match the number of characters of two string $ expr linuxos : linux $ expr linuxos : linuxo

regards, T.Dhanasekar