pid monitor script on linux server

I am trying to figure out. how to monitor a pid. if the service/pid is down. it should send an email.
pranav987Asked:
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woolmilkporcConnect With a Mentor Commented:
Let's assume the process is called "myservice":

if ! ps -ef | grep -q [m]yservice;  then
    echo "myservice on Host $(hostname) down" | mailx -s "Process Alert" recipient@domain.tld
fi

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You could run the script in regular intervals via cron.
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SandyCommented:
or you can run the above script once with for loop and sleep interval.
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pranav987Author Commented:
i tried running the below script.

#!/bin/bash

if ! ps -ef | grep -q 123;  then
    echo "myservice on Host $(hostname) down" | mail -s "Process Alert" xxx@xxx.com
fi


it is not emailing me.
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woolmilkporcCommented:
I'm rather sure that the string "123" almost always appears somewhere in the process list, so grep would find it and the script would of course not send mail.

Do you really want to search for the numeric PID? Are you aware that this number will change on each restart of the process (with a few exceptions linke "init" etc.)?

That's why I suggested searching for the command name instead of the PID.

But if it must be the PID and if this PID is indeed always "123" you can try "grep -w" to search for "123" between word boundaries:

if ps -ef | grep -qw 123 ; then
...


wmp
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woolmilkporcCommented:
Reducing the output of "ps" to show just the PID is certainly a bit more reliable:

#!/bin/bash
if ! ps -eo pid | grep -qw 123;  then
    echo "myservice on Host $(hostname) down" | mail -s "Process Alert" xxx@xxx.com
fi

This works with my initial suggestion (using the command name) as well:

#!/bin/bash
if ! ps -eo comm | grep -qw "myservice" ;  then
    echo "myservice on Host $(hostname) down" | mail -s "Process Alert" xxx@xxx.com
fi
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pranav987Author Commented:
whenever i grep. its generating below value also and making script not to work.

ex:--
ps -ef |grep 123
root     14582  5590  0 18:13 pts/8    00:00:00 grep 123

can you please suggest. how to avoid this.
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woolmilkporcCommented:
grep -w [1]23

or

grep -v grep | grep -w 123

Did you read my remarks about PIDs above?
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pranav987Author Commented:
thanks woolmilkporc. i did not use [].
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