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Full Discussion: Running options in bash script
Top Forums Shell Programming and Scripting Running options in bash script Post 303011028 by Don Cragun on Friday 12th of January 2018 02:58:34 AM
Old 01-12-2018
Why aren't you using getopts? Having consistent methods of parsing options greatly contributes to the ability of users unfamiliar with your code automatically know how to get a quick view of the syntax of your utility (with something like: utility -?), the ability to specify options separately or combined and in any order:
Code:
utility -Rq
utility -qR
utility -R -q
utility -q -R

should all produce the same results. And, you should have a built-in help/usage message if an unknown option is found. Instead, your code silently ignores unknown options (leading users to believe that the options they provided were correct when, instead, nothing will be done by your code).

You generally want to set flags while processing options, not run the functions that the options indicate should be run (after you have determined all of hte options that are present).

Your code seems to indicate that the -R option in your utility must always be present. Why have an option if it is always required to be set?
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LEARN ABOUT OPENDARWIN

env

ENV(1)							    BSD General Commands Manual 						    ENV(1)

NAME

     env -- set and print environment

SYNOPSIS

     env [-i] [name=value ...] [utility [argument ...]]

DESCRIPTION

     env executes utility after modifying the environment as specified on the command line.  The option name=value specifies an environmental
     variable, name, with a value of value.  The option '-i' causes env to completely ignore the environment it inherits.

     If no utility is specified, env prints out the names and values of the variables in the environment, with one name=value pair per line.

DIAGNOSTICS

     If the utility is invoked, the exit status of env shall be the exit status of utility; otherwise, the env utility exits with one of the fol-
     lowing values:

     0	     The env utility completed successfully

     1-125   An error occurred in the env utility.

     126     The utility specified by utility was found, but could not be invoked.

     127     The utility specified by utility could not be found.

COMPATIBILITY

     The historic - option has been deprecated but is still supported in this implementation.

SEE ALSO

     execvp(3), environ(7)

STANDARDS

     The env utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').

BUGS

     env doesn't handle commands with equal (``='') signs in their names, for obvious reasons.

BSD
								  August 27, 1993							       BSD
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