A script calling watch and multitail

printLinesFunction_with_multitail.sh (text/plain), 1.24 KB, created by Juergen Rose on 2010-04-16 16:22:06 UTC

#!/bin/bash

Start_time=`date +"%s"`
script=${0##*/}
Script_PID=$$

function printNlines_with_seconds() {
	n=$1
	if [ -z "$n" ]; then
		n=6
	fi
	if [ $n -lt 6 ]; then
		n=6
	fi
	if [ -f "${script}_$Script_PID.out" ]; then
		read j < "${script}_$Script_PID.out"
	else
		j=0
	fi
	echo "$[j+1]" > "${script}_$Script_PID.out"

	printf "#---  1  --  \$$=%5d  PPID=%5d ---# This script should print $n (>6) lines\n" $$ $PPID
	printf "#     2    Script_PID=%5d          #\n" $Script_PID
	printf "#     3    kill with pressing %-4s   #\n" "'$2'"
	for ((i=4;i<$[n-2];i++)) {
		printf "#    %2d                              #\n" $i
	}
	printf "#=== %2d =============================#\n" $[n-2]
	Time=`date +"%s"`
	seconds=$[Time-$Start_time]
	printf "     %2d     j=%4d  seconds=%4d     #\n" $[n-1] $j $seconds
	printf "#=== %2d =============================#\n" $n
}

export Start_time script Script_PID
export -f printNlines_with_seconds

cmd="printNlines_with_seconds"

for ((n=10;n<16;n++)) {
	echo "cmd=$cmd;  before execute 'watch \"$cmd $n ^C\"';  kill with '^C'";   sleep 3
	watch "$cmd $n ^C"
	echo "cmd=$cmd;  before execute 'multitail -rc 2 -wh $[n+1] -l \"$cmd $n q\"';  kill with 'q'";   sleep 3
	multitail -rc 2 -wh $[n+1] -l "$cmd $n q"
}

rm ${script}_$Script_PID.out