How to compare the output of a command with a string?

daYz · 12-31-2006, 08:31 AM

Hi,

I want to run a while loop when the output of a command is not equal to a certain string. I cannot determine how that can be done.

Can someone show me the correct way of doing this?

Thanks! And a happy new year!

Ben

raskin · 12-31-2006, 09:51 AM

Read 'man bash'. So:
while [ "$( command )" != "string" ]; do something; done;
$( ) will substitute output of what is inside.
"" will stop word splitting.
[ is builtin that tests some conditions, like != for strings.

daYz · 12-31-2006, 10:36 AM

Quote:

Originally Posted by raskin

Read 'man bash'. So:
while [ "$( command )" != "string" ]; do something; done;
$( ) will substitute output of what is inside.
"" will stop word splitting.
[ is builtin that tests some conditions, like != for strings.

Raskin thank you very much. I works very well.

I can always appreciate the help from people on boards so much.

Happy new year!

Ben