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How to Use Multiple if Conditions in Shell script

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# 1  
Old 06-25-2009
Question How to Use Multiple if Conditions in Shell script
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  
Old 06-25-2009
depending on your shell, you may need to write like this...
Code:
if [[ ( "$val" -ge "36000" ) && ( "$val" -le "42000" ) ]] || [[ ( "$val" -ge "60000" ) && ( "$val" -le "66000" ) ]]

if it does not work, let me know your shell.
# 3  
Old 06-25-2009
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  
Old 06-25-2009
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  
Old 06-25-2009
Thanks for the quick reply
# 6  
Old 06-25-2009
No need for the use of '[[ ]]" twice within the if statement. It can be done with a single test.
Code:
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
Code:
if (( ( val > 36000  &&  val < 42000 ) || ( val > 60000  &&  val < 66000 ) ))

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