Use PHP to create edit and delete crontab jobs

Question

Is it possible to use PHP to create  edit and delete crontab jobs   I know how to list the current crontab jobs of the Apache user    output   shell exec  crontab -l    echo  output    But how to add a cron job with PHP   crontab -e  would just open a text editor and you will have to manually edit the entries before saving the file   And how to delete a cron job with PHP  Again you have to manually do this by  crontab -e    With a job string like this    job    0   2        usr bin php5  home user1 work php     How do I add it to the crontab jobs list with PHP

User · Answer

You could try overriding the EDITOR environment variable with something like ed which can take a sequence of edit commands over standard input

User · Answer

Check a cronjob  function cronjob exists  command         cronjob exists false       exec  crontab -l    crontab         if isset  crontab  amp  amp is array  crontab              crontab   array flip  crontab            if isset  crontab  command                   cronjob exists true                        return  cronjob exists      Append a cronjob  function append cronjob  command        if is string  command  amp  amp  empty  command  amp  amp cronjob exists  command    FALSE              add job to crontab         exec  echo -e   crontab -l  n   command      crontab -    output                return  output      Remove a crontab  exec  crontab -r    crontab     Example  exec  crontab -r    crontab    append cronjob            curl -s http   localhost cron test1 php     append cronjob            curl -s http   localhost cron test2 php     append cronjob            curl -s http   localhost cron test3 php

User · Answer

The easiest way is to use the shell exec command to execute a bash script  passing in the values as parameters  From there  you can manipulate crontabs like you would in any other non-interactive script  and also ensure that you have the correct permissions by using sudo etc   See this  Crontab without crontab -e  for more info

User · Answer

crontab command usage   usage   crontab  -u user  file         crontab  -u user    -e   -l   -r                    default operation is replace  per 1003 2          -e       edit user s crontab          -l       list user s crontab          -r       delete user s crontab          -i       prompt before deleting user s crontab    So    output   shell exec  crontab -l    file put contents   tmp crontab txt    output            NEW CRON  PHP EOL   echo exec  crontab  tmp crontab txt      The above can be used for both create and edit append provided the user has the adequate file write permission   To delete jobs   echo exec  crontab -r      Also  take note that apache is running as a particular user and that s usually not root  which means the cron jobs can only be changed for the apache user unless given crontab -u privilege to the apache user

User · Answer

You can put your file to  etc cron d  in cron format  Add some unique prefix to the filenaname To list script-specific cron jobs simply work with a list of files with a unique prefix  Delete the file when you want to disable the job

User · Answer

Its simple You can you curl to do so  make sure curl installed on server    for triggering every minute              curl --request POST  https   glassdoor com admin sendBdayNotification             minute     hour          day           month           week   Let say you want to send this notification 2 15 PM everyday You may change POST GET based on your API   15 14       curl --request POST  url of ur API

User · Answer

This should do it  shell exec  crontab -l     cat  echo    1                        command      crontab -

User · Answer

I tried the solution below  class Crontab       In this class  array instead of string would be the standard input   output format      Legacy way to add a job      output   shell exec   crontab -l  echo     job       crontab -     static private function stringToArray  jobs              array   explode   r n   trim  jobs       trim   gets rid of the last  r n     foreach   array as  key   gt   item            if   item                      unset  array  key                        return  array     static private function arrayToString  jobs   array           string   implode   r n    jobs       return  string     static public function getJobs          output   shell exec  crontab -l        return self  stringToArray  output      static public function saveJobs  jobs   array           output   shell exec  echo    self  arrayToString  jobs       crontab -        return  output      static public function doesJobExist  job              jobs   self  getJobs        if  in array  job   jobs             return true        else           return false           static public function addJob  job             if  self  doesJobExist  job             return false        else            jobs   self  getJobs             jobs      job          return self  saveJobs  jobs            static public function removeJob  job             if  self  doesJobExist  job              jobs   self  getJobs            unset  jobs array search  job   jobs             return self  saveJobs  jobs         else           return false               credits to   Crontab Class to Add  Edit and Remove Cron Jobs

User · Answer

Nice    Try this to remove an specific cron job  tested     lt  php  output   shell exec  crontab -l      gt   lt  php  cron file     tmp crontab txt     gt    lt  -- Execute script when form is submitted -- gt   lt  php if isset   POST  add cron         gt    lt  -- Add new cron job -- gt   lt  php if  empty   POST  add cron         gt   lt  php file put contents  cron file   output   POST  add cron   PHP EOL     gt   lt  php     gt    lt  -- Remove cron job -- gt   lt  php if  empty   POST  remove cron         gt   lt  php  remove cron   str replace   POST  remove cron     n        output     gt   lt  php file put contents  cron file   remove cron PHP EOL     gt   lt  php     gt    lt  -- Remove all cron jobs -- gt   lt  php if isset   POST  remove all cron         gt   lt  php echo exec  crontab -r      gt   lt  php   else     gt   lt  php echo exec  crontab  cron file      gt   lt  php     gt    lt  -- Reload page to get updated cron jobs -- gt   lt  php  uri     SERVER  REQUEST URI      gt   lt  php header  Location   uri      gt   lt  php exit    gt   lt  php     gt    lt b gt Current Cron Jobs  lt  b gt  lt br gt   lt  php echo nl2br  output     gt    lt h2 gt Add or Remove Cron Job lt  h2 gt   lt form method  post  action   lt  php   SERVER  REQUEST URI      gt   gt   lt b gt Add New Cron Job  lt  b gt  lt br gt   lt input type  text  name  add cron  size  100  placeholder  e g              usr local bin php -q  home username public html my cron php  gt  lt br gt   lt b gt Remove Cron Job  lt  b gt  lt br gt   lt input type  text  name  remove cron  size  100  placeholder  e g              usr local bin php -q  home username public html my cron php  gt  lt br gt   lt input type  checkbox  name  remove all cron  value  1  gt  Remove all cron jobs  lt br gt   lt input type  submit  gt  lt br gt   lt  form gt

User · Answer

We recently prepared a mini project  PHP  5 3  to manage the cron files for private and individual tasks  This tool connects and manages the cron files so you can use them  for example per project  Unit Tests available  -   Sample from command line   bin cronman --enable  var www myproject  cronfile --user www-data   Sample from API   use php manager crontab CrontabManager    crontab   new CrontabManager     crontab- gt enableOrUpdate   tmp my crontab txt     crontab- gt save      Managing individual tasks from API   use php manager crontab CrontabManager    crontab   new CrontabManager     job    crontab- gt newJob     job- gt on                job- gt onMinute  20-30  - gt doJob  echo foo     crontab- gt add  job    job- gt onMinute  35-40  - gt doJob  echo bar     crontab- gt add  job    crontab- gt save      github  php-crontab-manager

User · Answer

Instead of crontab you could also use google s app engine task queue  It has a generous free quota  is fast  scalable  modifiable

User · Answer

Depends where you store your crontab   shell exec  echo      job      gt  gt  crontab

[php] Use PHP to create, edit and delete crontab jobs?

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