Create an integer variable
From Linux Shell Scripting Tutorial - A Beginner's handbook
- To create an integer variable use the declare command as follows:
declare -i y=10 echo $y
- Create a shell script called intmath.sh:
#!/bin/bash # set x,y and z to an integer data type declare -i x=10 declare -i y=10 declare -i z=0 z=$(( x + y )) echo "$x + $y = $z" # try setting to character 'a' x=a z=$(( x + y )) echo "$x + $y = $z"
Save and close the file. Run it as follows:
chmod +x intmath.sh ./intmath.sh
10 + 10 = 20 0 + 10 = 10
- When you try to set the variable x to character 'a', shell converted it to an integer attribute i.e. zero number.