pslineage

#!/bin/zsh
#
# Dublin Core Metadata
DC_title=".sh"
DC_rightsHolder="Steven J. DeRose"
DC_creator="http://viaf.org/viaf/"
DC_type="http://purl.org/dc/dcmitype/Software"
DC_language="bash"
DC_created="2020-12-11"
DC_modified="2020-12-11"
DC_publisher="http://github.com/"
DC_license="https://creativecommons.org/licenses/by-sa/3.0/"
#
# https://superuser.com/questions/150117/
#
if isHelpOption "$1"; then
    echo "Shell function ${FUNCNAME[0]}, from $me: "
    echo "    Show the chain of parent processes, given a pid."
    exit
fi

bashPID=$$
if ! [ "$1" ]; then
    targetPID=$bashPID
else
    targetPID=$1
fi

while [[ $targetPID -gt 0 ]]; do
    #echo "Target pid: $targetPID"
    par=`ps -p $targetPID -o ppid | tail -n 1`
    cmd=`ps -p $targetPID -o command | tail -n 1`
    echo "$par: $cmd"
    targetPID=$par
done