Set timeout for the program

Timeout is a wonderful Linux Command that can control the running time of the program, which is very useful for controlling the running time of the program.

Timeout on the CentOS 6 platform, from the software package coreutils

# which timeout/usr/bin/timeout# rpm -qf /usr/bin/timeoutcoreutils-8.4-19.el6_4.2.x86_64

The principle of timeout is very simple. It is a simple timer and a kill command, where-s can be used with the kill parameter. It depends on how to kill it.

Man timeout is only half a page, as shown below

TIMEOUT(1)                       User Commands                      TIMEOUT(1)NAME       timeout - run a command with a time limitSYNOPSIS       timeout [OPTION] NUMBER[SUFFIX] COMMAND [ARG]...       timeout [OPTION]DESCRIPTION       Start  COMMAND,  and kill it if still running after NUMBER seconds.  SUFFIX may be ‘s’ for seconds (the default), ‘m’ for minutes, ‘h’       for hours or ‘d’ for days.       Mandatory arguments to long options are mandatory for short options too.       -s, --signal=SIGNAL              specify the signal to be sent on timeout.  SIGNAL may be a name like ‘HUP’ or a number.  See ‘kill -l‘ for a list of signals       --help display this help and exit       --version              output version information and exit       If the command times out, then exit with status 124.  Otherwise, exit with the status of COMMAND.  If no signal is specified, send the       TERM signal upon timeout.  The TERM signal kills any process that does not block or catch that signal.  For other processes, it may be       necessary to use the KILL (9) signal, since this signal cannot be caught.AUTHOR       Written by Padraig Brady.

Example

timeout 120 command

If the preceding command is completed within 120 seconds, the system ends safely and is killed after running for more than 120 seconds.

The script is often completed with a dumb breath, so we need to write another script to regularly kill it. With the timeout command, the waist does not hurt, and the legs are not sour. It is healthier to take a rest.

In a word, we don't need to re-engineer the wheel in the script or crontab.

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