Shell Programming and Scripting

I have the following script (MyScript):

#!/bin/sh
ps U erv | grep -v grep | grep -F "/usr/bin/collect -o 101"
echo "Result: $?"

When executed from the command line, I get
... (the line containing /usr/bin/collect -o 101)
Result: 0
(which is correct since collect is running)

When I put the script in cron with:
*/10 * * * * ./MyScript >>log.log

in log.log I get
Result: 1

What is wrong?
I tried to put the complete path for ps and grep, but I had the same result.
Could be because the command displayed by ps is truncated? How can I display it all?

Please help!

You need to specify the full path name in cron.

e.g.

Code:

/home/myuser/MyScript >>log.log

Tip: The environment in cron is limited. Try a creating a cron containing just an "env" command and a "pwd" command and then compare the output with what you get if you type those commands when logged in as yourself. The "." in "./MyScript >>log.log" refers to your current directory which will no doubt be different from the current directory when running from cron.

BTW. Is your ps command syntactically correct? May be a typo in the post?

who would the file contain the result of echo "Result: $?" then? it shouldnt have anything in the log if it failed, the failure was from within the script.

---------- Post updated at 05:46 PM ---------- Previous update was at 05:45 PM ----------

try

#!/bin/sh
/bin/ps U erv | /bin/grep -v grep | /bin/grep -F "/usr/bin/collect -o 101"
echo "Result: $?"

I can reproduce the error response from a shell prompt on a system which is not running anything called "collect":

Code:

#!/bin/sh
ps U erv | grep -v grep | grep -F "/usr/bin/collect -o 101"
echo "Result: $?"
Result: 1

The response is coming from the "grep -F" statement. On my system the parameter "U" is ignored. If "erv" is a username maybe the command should be "ps -fu erv" ? The "ps" command as posted will not produce a wide output containing command parameters.

In other words the "grep -F" is not finding the matching string because the "ps" statement is not outputting that string.

Yes, the ps command truncates the output. I added the option -w (ps -w -U erv |...)and it seems working.
Thank you.