Echo output from command

mogabr · #1 12-28-2012

Hello

i am trying to do some calculation from output command

for example

Code:

ls -l
if [ "$ wc -l" -gt 2 ]
then
echo "error"
else
echo "$"
fi

Don Cragun · #2 12-28-2012

If I understand what you're trying to do, the following should be the syntax you need:

Code:

if [ "$(ls -l|wc -l)" -gt 2 ]
then
        echo 'error'
else
        echo '$'
fi

mogabr · #3 12-28-2012

Quote:

Originally Posted by Don Cragun

If I understand what you're trying to do, the following should be the syntax you need:

Code:

if [ "$(ls -l|wc -l)" -gt 2 ]
then
        echo 'error'
else
        echo '$'
fi

This won't display the output from the ls command. If you want to display the output from the ls command, change the

Code:

"$(ls -l|wc -l)"

to:

Code:

"$(ls -l|tee /dev/tty|wc -l)"

I don't understand why you want the echo "$" ; it is the default normal user shell prompt and may confuse users if it looks like your script produces two shell prompts.

hello

i give

Code:

ls -l

Don Cragun · #4 12-28-2012

Quote:

Originally Posted by mogabr

hello

i give

Code:

ls -l

as example
but i want general operator that display output from last run command

So use one of the examples I gave you, but replace ls -l and wc -l with the commands you want to use.

If you would tell us what you really want to do instead of a fake example that reports an error if there is more than one file (with a name not starting with a period (".")) in a directory, we might be able to give you a template that will actually do what you want done.

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