Home / ubuntu / Questions / 863342
In Process
JanezKranjski
Asked: 2016-12-22 21:03:50 +0800 CST

How can I execute SH script in Crontab

  • 772

I have one simple .sh script:

#!/bin/bash
echo "Test1"
touch /home/john/test.txt
echo "Test2"

It is executable and available (ugo+x). If I run this script, it works like I expected.

But if I try to run it in crontab, then I don't get any results. I can see in log, that job starts and I get (No MTA installed, discarding output).

AFAIK - this message isn't error? It just means that I don't have a mail (or other output channel)? But why there is no results from script? BTW - in CRONTAB I use next line:

30 * * * * sh file.sh >> /home/john/log.log

Any idea?

scripts

2 Answers

  1. If your script is executable, then you don't need to have your crontab running /bin/sh file.sh.

    Also, file.sh probably isn't in the directory crontab runs on. You'll prefer using /path/to/file.sh

    Redirecting your crontab output, you'll want to catch stderr as well. Having caught both stdout & stderr, I seem to recall crontab no longer complains about its ability to relay output.

    30 * * * * /path/to/file.sh >> /home/john/log.log 2>&1
    • 4

  2. Thank you all, with your suggestions I have found mistake. I didn't use full paths in crontab and this was the reason.

    • 0