写脚本的时候，经常需要用到超时控制。看《shell专家编程》时看到一个好例：修改了一下，
1.超过timeout时间还没执行完，则kill进程，发邮件告警:
set-x
mailSend()
{
mailContent="xxxx Web
response time over 5 seconds"
echo $mailContent
| mail -s "xxxxxx
Web TimeOut"[email protected].cion
}
timeout()
{
waitfor=3
command=$*
$command
&
commandpid=$!
( sleep $waitfor
; kill -9
$commandpid >/dev/null2>&1&&
mailSend )&
watchdog=$!
sleeppid=$PPID
wait $commandpid
>/dev/null2>&1
kill
$sleeppid >/dev/null2>&1
}
#测试的函数
test123()
{
sleep 20
}
timeout test123
2.超过timeout时间还没执行完，只发邮件告警，程序正常执行:
mailSend()
{
mailContent="xxxxe Web
response time over 5 seconds,Please have a check !"
echo $mailContent | mail
-s "xxxxx
WEB response time over 5 senconds"
$mailTo
}
timeout()
{
waitfor=6
command=$*
$command
&
commandpid=$!
( sleep $waitfor
; mailSend
)&
watchdog=$!
sleeppid=$PPID
wait $commandpid
>/dev/null2>&1
kill -9 $watchdog >/dev/null2>&1
kill $sleeppid >/dev/null2>&1
}