title: Start nginx from shell script on crontab
body: <p>I want to check NGINX is running or not every 1 minute.
  My shell script is:</p>
  
  <pre><code>#!/bin/sh
  ps auxw | grep nginx | grep -v grep &gt; /dev/null
  if [ $? != 0 ]
  then
  echo "NGINX is not running"
  /etc/init.d/nginx start
  else
  echo "NGINX is running"
  fi
  </code></pre>
  
  <p>Script run with <code>sh launch.sh</code> correctly (If NGINX is not running, run NGINX).
  The problem is when I want to run the script every 1 minute by crontab, nothing happens. Crontab list is here:</p>
  
  <pre><code># Edit this file to introduce tasks to be run by cron.
  # 
  # Each task to run has to be defined through a single line
  # indicating with different fields when the task will be run
  # and what command to run for the task
  # 
  # To define the time you can provide concrete values for
  # minute (m), hour (h), day of month (dom), month (mon),
  # and day of week (dow) or use '*' in these fields (for 'any').# 
  # Notice that tasks will be started based on the cron's system
  # daemon's notion of time and timezones.
  # 
  # Output of the crontab jobs (including errors) is sent through
  # email to the user the crontab file belongs to (unless redirected).
  # 
  # For example, you can run a backup of all your user accounts
  # at 5 a.m every week with:
  # 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
  # 
  # For more information see the manual pages of crontab(5) and cron(8)
  # 
  # m h  dom mon dow   command
  
  * * * * * ~/sh launch.sh
  </code></pre>
  
  <p>I test <code>* * * * * sh launch.sh</code>, <code>* * * * * launch.sh</code> and <code>* * * * * ./launch.sh</code> but none of them work correctly.
  My OS is UBUNTU 18.04.</p>
  
  <p>This is log:</p>
  
  <pre><code>Jun  3 08:28:01 hajitsu-VirtualBox CRON[3239]: (root) CMD (~/launch.sh)
  Jun  3 08:28:01 hajitsu-VirtualBox CRON[3240]: (hajitsu) CMD (/home/hajitsu/launch.sh)
  Jun  3 08:28:01 hajitsu-VirtualBox CRON[3238]: (CRON) info (No MTA installed, discarding output)
  Jun  3 08:28:01 hajitsu-VirtualBox CRON[3237]: (CRON) info (No MTA installed, discarding output)
  Jun  3 08:29:01 hajitsu-VirtualBox CRON[3374]: (root) CMD (~/launch.sh)
  Jun  3 08:29:01 hajitsu-VirtualBox CRON[3373]: (CRON) info (No MTA installed, discarding output)
  Jun  3 08:29:01 hajitsu-VirtualBox CRON[3376]: (hajitsu) CMD (/home/hajitsu/launch.sh)
  Jun  3 08:29:01 hajitsu-VirtualBox CRON[3372]: (CRON) info (No MTA installed, discarding output)
  </code></pre>
  
  <p>I think the command fired but nothing happend.</p>