lockfile

-triggered when someone kills a script process using killEXITExit-This is a pseudo-signal that is triggered when the script exits normally or after a set-e because of an errorWhen you use the lock file, you can write this:if [!-e $lockfile]; ThenTouch $lockfileCritical-sectionRM $lockfileElseecho "Critical-section is already running"FiWhen the most important part (Critical-section) is running, what happens if the script process is killed? The lock fil

file::lockfile, File::P ID, Proc::P id::file , etc. Here is an example of file::lockfile, which is very simple: Here is the code snippet: 01 #!/usr/bin/perl-w 02 Usefile::lockfile; 03 # lock file is located in the/tmp directory, named Test_file_lock.lck 04 My $

complete the above functions, suchFile: lockfile,File: PID,Proc: PID: File. The following is an example of file: lockfile, which is very simple: Below isCodeFragment: 01 #! /Usr/bin/perl-W 02 UseFile: lockfile; 03 # The lock file is located in the/tmp directory named test_file_lock.lck

In some cases, a process can only generate one instance for execution. In a Unix environment, the file-and record-locking mechanisms are provided, and basic solutions for single-instance processes are provided.Assume that a process generates a file when it starts to run, and locks the entire file, and only one of these write locks can be generated.If the subsequent process tries to generate a write lock, it will fail. This implies that the previous instance is running. The following method det

when the script Exits normally or after set-e exits due to an error. When you use the lock file, you can write: if [! -E $ lockfile]; thentouch $ lockfilecritical-sectionrm $ lockfileelseecho "critical-section is already running" fi when the most important part (critical-section) is running, what happens if the script process is killed? The lock file will be thrown there, and your script will no longer run until it is deleted. Solution: if [! -E $

once, how to handle 4) stop, delete/var/lock/subsys/script_name, and display "Stop complete" consider: if it has stopped beforehand, how to deal with it? 5) Restart, stop, then start to consider : If there is no start, how to handle 6) How is the Status,/var/lock/subsys/script_name file exists, then displays "Script_nameisrunning ..."/var/ Lock/subsys/script_name file does not exist, it displays "script_nameisstopped ..." Where: Script_name is the current script name. $0#!/bin/bash#chkconfig:-8

configuration. . /etc/sysconfig/network # Check that networking are up. ["$NETWORKING" = "no"] exit 0 nginx= "/usr/sbin/nginx" prog=$ (basename $nginx) Nginx_conf_file= "/etc/nginx/nginx.conf" [-f/etc/sysconfig/nginx] . /etc/sysconfig/nginx Lockfile=/var/lock/subsys/nginx Make_dirs () { # Make required Directories User= ' Nginx-v 2>1 | grep "Configure arguments:" | Sed ' s/[^*]*--user=\ ([^]*\). */\1/g '-' Options= ' $nginx-v 2>1 | grep

/shirdrn/article/details/71055392. Provide service startup scripts for MongoDB and startClick (here) to collapse or open #vim/etc/init.d/mongod #内容如下 ———————————————————————————————— #!/bin/bash # Chkconfig:-90 11 # DESCRIPTION:MONGODB Server SysV Script . /etc/rc.d/init.d/functions if [-f/etc/sysconfig/mongod]; Then . /etc/sysconfig/mongod Fi Mongod=/usr/local/mongodb/bin/mongod Prog=mongod Lockfile=/data/db/mongod.lock

"No such user."Fi}Username=$1UserInfoUsername=$2UserInfoExample 2: Service scripting framework#!/bin/bash## Chkconfig:-50 50# description:test Service Script#prog=$ (basename)lockfile=/var/lock/subsys/$progStart () {If [-f $lockfile]; Thenecho "$prog is running yet."ElseTouch $lockfile[$?-eq 0] echo "Start $prog finshed."Fi}Stop () {If [-f $

, resulting in file corruption. Here is the code I wrote for The Docker container to process the file system lock: #! /Bin/bash # The location the lock will be attempted in LOCKROOT = "/minecraft/lock" LOCKDIRNAME = "lock" LOCKFILENAME = "mylock. lck" # This is the command to run if we get the lock. RUNCMD = "./start. sh" # Number of seconds to consider the Lock stale, this cocould be application dependent. LOCKTIMEOUT = 60 SLEEPLOOP = 30 LOCKDIR =$ {LOCKROOT}/$ {LOCKDIRNAME}

. please contact us if you have any questions"); } 2. initialize the information and enter the chat room for the first time. If ($ action = "enter ") { //////////////// Call the js program that displays the home screen ////////////// ////// Print ("parent. write2 (); n "); // The Speech Content. xx entered the chat room $ Message = "$ name Go to the chat room ". $ message." ". date (" m Month d h: I ")." script parent. add ('$ name ', '$ Photo'); parent. write1 (); script "; } // Update the

mongod file in the/etc/init. d directory The content is as follows: #!/bin/sh##mongod - Startup script for mongod## chkconfig: - 85 15# description: Mongodb database.# processname: mongod# Source function library. /etc/rc.d/init.d/functions# things from mongod.conf get there by mongod reading it# OPTIONSOPTIONS=" -f /etc/mongod.conf"#mongodmongod="/root/mongodb/bin/mongod"lockfile=/var/lock/subsys/mongodstart(){ echo -n $"Starting mongod: " daemon