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Full Discussion: Odd(?) shell script practise
The Lounge What is on Your Mind? Odd(?) shell script practise Post 302803965 by Don Cragun on Tuesday 7th of May 2013 08:24:44 PM
Old 05-07-2013
It is fairly common practice when writing software that is to be used in multiple operating environments to use a scheme like one of these as a configuration option when installing the software. Obviously the copyrighted code in example 2 from HP configures itself each time the script runs based on the results of a call to uname. How the IBM script in example 1 and the nagios script in example 3 are setup may be hidden in the ... areas of the code you didn't show or during the installation of these scripts.

I don't know of any university course that teaches this style, but you can bet that HP, IBM, and Oracle have coding guidelines (and probably internal classes) that specify coding styles for these kinds of application scripts.
 

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LEARN ABOUT CENTOS

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

       If the init script file does not exist, the script tries to use legacy actions.	If there is no suitable legacy action found and COMMAND is
       one of actions specified in LSB Core Specification, input is redirected to the systemctl.  Otherwise the command fails with return code 2.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5)

								     Jan 2006								service(8)
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