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Full Discussion: Running options in bash script
Top Forums Shell Programming and Scripting Running options in bash script Post 303011034 by apmcd47 on Friday 12th of January 2018 06:34:04 AM
Old 01-12-2018
I can think of two methods of implementing a quiet mode. First, use redirections.

Code:
if [ "${quietmode}" = "yes" ]
then 
   exec >/dev/null
fi
printf "this will not be printed in quiet mode\n"
printf "this is a required message and will be printed\n" > /dev/tty

Alternatively:
Code:
if [ "${quietmode}" = "yes" ]
then
   exec 3>/dev/null
else
   exec 3>&1
fi
printf "This won't be printed in quiet mode\n" >&3
printf "This will always be printed\n"

The other way is to use a function:
Code:
function myprint() {
   local mode=$1
   shift
   if [ "${mode}" = normal ] && [ "${quietmode}" = "yes" ]
   then
      return
   fi
   printf "$@"
}

myprint normal "this will not be printed in quiet mode\n"
myprint quiet "this will be printed always\n"

Untested.

Andrew
This User Gave Thanks to apmcd47 For This Post:
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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD
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