#!/bin/sh
# watch-like program
# ==================================================
# Version Author Date Description
# 0.1 April Lee 2014-03-27 initial
# ==================================================
echo "watch program"
echo "USAGE:"
echo "`basename ${0}` -t time -l lines -c commands"
echo "every 'time' to reflash; default is 2s"
echo "only show 'lines' lines; default is 10 "
echo "watch the 'commands'; default ls command"
echo
DATAFORMAT="%y-%m-%d %H:%M:%S"
while getopts t:c:l: opt
do
case "$opt" in
t) SLEEPTIME=$OPTARG;;
c) CMD=$OPTARG;;
l) SHOWLINES=$OPTARG;;
esac
done
: ${SLEEPTIME:=2} ${CMD:="ls"} ${SHOWLINES:=10}
while :
do
clear
echo "Every $SLEEPTIME s $PWD `date +"$DATAFORMAT"`"
# exec $CMD | sed -n "p" #awk 'for(i=0; i<10; i++){print $0}'
eval $CMD | awk '{if(NR <= '$SHOWLINES'){print $0}}'
sleep $SLEEPTIME
done转载于:https://my.oschina.net/swuly302/blog/213942
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