How to Use Multiple if Conditions in Shell script

Shell Programming and Scripting
1

if [[ "$val" -ge "36000" -a "$val" -le "42000" ] -o [ "$val" -ge "60000" -a "$val" -le "66000" ]]
then
echo "Expected valid value"

The above multiple if condition is NOT working in my script.
I am getting the error as '-a' not expected. Can anyone help with the syntax for this?

2

depending on your shell, you may need to write like this...

if [[ ( "$val" -ge "36000" ) && ( "$val" -le "42000" ) ]] || [[ ( "$val" -ge "60000" ) && ( "$val" -le "66000" ) ]]

if it does not work, let me know your shell.

3

Thank you sir..It is working..
Can you please tell me what was the problem with my script? is it depends on the shell?

4

Yes. it depends on shell. In bash you use -a -o not in ksh.
and I have formatted your if command to make it more readable.

5

Thanks for the quick reply

6

No need for the use of '[[ ]]" twice within the if statement. It can be done with a single test.

if [[ ( "$val" -ge "36000"  &&  "$val" -le "42000" ) || ( "$val" -ge "60000"  &&  "$val" -le "66000" ) ]]

It can also be done more easily and cleanly using (( )) which works for both ksh and bash

if (( ( val > 36000  &&  val < 42000 ) || ( val > 60000  &&  val < 66000 ) ))