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Full Discussion: How to avoid preceding whitespace using getopts?
Top Forums Shell Programming and Scripting How to avoid preceding whitespace using getopts? Post 303037158 by mohtashims on Thursday 25th of July 2019 12:58:10 AM
Old 07-25-2019
I was looking for the solution proposed by @Corona688. However, if the last arguments '-c' does not have any value associated which is fine; the script fails and displays the helpFunction. I want -c to be optional with or without a value. So, '-c' or '-c<args>' both should work.

Changing
Code:
      ? ) helpFunction;;

to
Code:
      \? ) helpFunction;;

makes all parameters optional however, I am looking for just parameter -c to be optional (-c may not neccessarily be the last parameter)

I want the solution to work for both bash and non-bash.

I'm using a helpfunction like below:

Code:
helpFunction()
{
   echo ""
   echo "Usage: $0 -a Region -b Location -c Environment"
   echo -e "\t-a Description of what is Region"
   echo -e "\t-b Description of what is Location"
   echo -e "\t-c Description of what is Environment"
   exit 1 # Exit script after printing help
}

and

Code:
while getopts ":a:b:c:" opt
do
   case "$opt" in
      a ) Region=$OPTARG;;
      b)Environment=$OPTARG;;
      c ) Location="$OPTARG";;
      ? ) helpFunction;;
   esac
done

echo "$Region"
echo "$Location"
echo "This_is_fine"
echo "$Environment"

Last edited by mohtashims; 07-25-2019 at 03:13 AM.. Reason: To provide more information about parameter c
 

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LEARN ABOUT OPENSOLARIS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)
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