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Renice a process and all of its children recursively

View my_renice.sh
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#!/usr/bin/env bash
 
# This can be run simply by passing it the outputs from pgrep:
# my_renice $(pgrep application)
#
# You may also want to use pgrep to find more complex processes based on arguments
# my_renice $(pgrep -f "bash.*$name")
 
function my_renice(){
newnice=10
pid=$1
 
# Return if pid not found
if [ -z $pid ]; then return; fi
 
# Renice pid right away in case we spawn more children
renice $newnice $pid
 
# Find children pids
children=$(pgrep -d ' ' -P $pid)
 
# Loop through children
for i in $children; do my_renice $i; done
}
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