Linux周期运行一个命令的脚本
在做测试的时候，有时候需要不断的运行一个命令或者脚本，下面的这个脚本可以实现这个目的。
使用方法：
usage: period.sh [options] <cmd> <args>
run command periodically.
options:
-c <count> : how many times.
-i <interval>: every <interval> seconds.
-h: show help
示例：
$ ./period.sh ls -l
$ ./period.sh -i 3 ls -l
#!/bin/shPROG_NAME=period.shINTERVAL=1ALWAYS_LOOP=1COUNT=-1#------------------------- functions --------------------------------------------------usage() { cat << ENDusage: $PROG_NAME [options] <cmd> <args> run command periodically.options: -c <count> : how many times. -i <interval>: every <interval> seconds. -h: show helpEND}run_cmd(){ echo $ $* eval $* echo}#---------------------------- main() --------------------------------------------------# get command line argumentswhile getopts "c:i:h" options; do case "$options" in c) COUNT=$OPTARG ;; i) INTERVAL=$OPTARG ;; h) usage; exit 0;; \?) usage; exit -1;; esacdoneshift $((OPTIND - 1))if [ $# -lt 1 ]; then usage; exit 0;fiif [ $COUNT -ge 0 ]; then ALWAYS_LOOP=0else COUNT=1fiwhile [ $ALWAYS_LOOP -eq 1 ] || [ $COUNT -gt 0 ]; do echo "#$INDEX Date: `date +%Y-%m-%d_%H:%M:%S`" run_cmd $* INDEX=$((INDEX + 1)) COUNT=$((COUNT - 1)) sleep $INTERVALdone