Other Commands

To do mathematical calculation like addition, subtraction use the expr command

B=`expr $A - 1`

B=`expr $A - $C`

There should be spaces between operators (+, /, - , *) and variables.

To remove leading zeroes for an integer field

B=00014

C=`expr $B + 0`

The addition of zeroes will remove the leading zeroes and the output will be

echo $C

14

To print/display a String stored in a variable using echo

S="HELLO SIR"

echo $S

To print with some more data

S="HELLO SIR"

echo "Today's date is ${S}"

The same can be written to file using redirect

S="HELLO SIR"

echo "Today's date is ${S}" > A.txt

To print New line before printing the text

export Count=”HI”

echo -e "\n T|$Count " >> $fn.txt

To find the OS installed

uname –a  to find the OS installed

To find the host name of the UNIX box

SERVER=`hostname`