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"Bash is the default user shell in most Linux distributions. In case of incidents affecting a UNIX server, they are chances that a Bash shell will be involved. Bash keeps an history to help the user to search (and reuse) his last commands:"

"Spend enough time on the command line and you'll eventually want to do many tasks…that take some intricate commands…repeatedly. A good example of this, is making thumbnails of photos. Basically, our workhorse of this script is not ImageMagick (which provides convert, identify and mogrify), but the for loop in bash itself. Ready? Grab your pen-knife and let's whittle out a script:"

"8.2. Managing System Services Note To expand your expertise, you might also be interested in the Red Hat System Administration II (RH134) training course. Previous versions of Red Hat Enterprise Linux, which were distributed with SysV init or Upstart, used init scripts located in the /etc/rc.d/init.d/ directory. These init scripts were typically written in Bash, and allowed the system administrator to control the state of services and daemons in their system. In Red Hat Enterprise Linux 7, these init scripts have been replaced with service units. "