Watch Process Id

Sometimes you want to keep tabs on a long running process and get notified by email when it is done. This is an example of just that.

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#!/bin/bash
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pid=$1
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me="$(basename $0)($$):"
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if [ -z "$pid" ]
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then
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    echo "$me a PID is required as an argument" >&2
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    exit 2
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fi
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name=$(ps -p $pid -o comm=)
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if [ $? -eq 0 ]
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then
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    echo "$me waiting for PID $pid to finish ($name)"
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    while ps -p $pid > /dev/null; do sleep 1; done;
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else
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    echo "$me failed to find process with PID $pid" >&2
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    exit 1
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fi
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## I used a python mailer but mostlikely this will be mail or mailx.
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python pymail.py $pid