linux-shell/1 – FMI Tasks/Shell/05-b-7550 1st sol.sh at master · andy489/linux-shell

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#!/bin/bash

# 05-b-7550 1st solution

# github.com/andy489

: '

Do not use kill -9

It does not give the process a chance to cleanly:

1) shut down socket connections

2) clean up temp files

3) inform its children that it is going away

4) reset its terminal characteristics

and so on and so on.

Generally, send 15, and wait a second or two, and if that does not work, send 2,

and if that does not work send 1. If that does not work, REMOVE THE BINARY because

the program is badly behaved!

if [ $# -ne 1 ]; then

echo "Invalid number of arguments!"

exit 1

USER="${1}"

if [ $(id -u "${USER}") -eq 1 ]; then

echo "Invalid username!"

exit 2

PS_CNT=0

while read PID; do # read -d $'\n' PID

kill -15 "${PID}"

sleep 1

kill -9 "${PID}"

PS_CNT=(($PS_CNT+1))

done < <(ps -u "${USER}" -o pid=)

echo "Total: ${PS_CNT} killed processes"