shell script

[munderw2]

I'm writing a script in solaris 9, and need to test the standard out of a grep operation to see if it finds anything. Any ideas? Here's the code i have:

onstat -u|grep "Y--P"|awk '{print $1,$2,$3}'

I want to put it in an if statement like this:
If
grep returns something
then
else
exit
fi

 

[Edcrosbys]

The $? is the return code from the previous run cmd. Return of 0 is good (it found something) return of higher is bad (nothing found).

onstat -u |grep "Y--P" >/dev/null 2>&1

if [[ $? -lt 1 ]]
then
    echo "Found Needle"
else
    echo "Haystack Clean"
fi

OR this would probably be more useful

needle=`onstat -u |grep "Y--P"` 2>/dev/null
if [[ $? -lt 1 ]]
then
    echo "Found Needle:"
    echo ${needle}
else
    echo "Haystack Clean"
fi

 

[Annihilannic]

Typically, based on Ed's first example, I would do it like this:

if onstat -u |grep "Y--P" >/dev/null 2>&1
then
    echo "Found Needle"
else
    echo "Haystack Clean"
fi

But because of the awk step in there, I'd adapt Ed's second example as follows:

needle=`onstat -u |grep "Y--P"` 2>/dev/null
if [[ $? -lt 1 ]]
then
    echo "Found Needle:"
    echo ${needle} | awk '{print $1,$2,$3}'
else
    echo "Haystack Clean"
fi

But... again... if it were me, I probably wouldn't use grep at all:

needle=$(onstat -u | awk '/Y--P/ {print $1,$2,$3}')
if [[ "$needle" ]]
then
    echo "Found Needle:"
    echo ${needle} 
else
    echo "Haystack Clean"
fi

Annihilannic.