Sponsored Content
Full Discussion: using getopts
Top Forums Shell Programming and Scripting using getopts Post 302332500 by som.nitk on Thursday 9th of July 2009 09:22:54 AM
Old 07-09-2009
using getopts

I have a program where I want to use getopts.
I want to use "-i" option and then optionally supply arguments.
If user dosent supply arguments, then also it should work.
Please tell me how to proceed.
Here is some code, this is not right code btw but a sample to understand what I want to do:

while getopts :tui:c:p: swtch
                case $swtch in
                        u) echo "Un-installing feature is under development.";;
                                echo $OPTARG
                                if [[ $OPTARG = "" ]]
                                       ValidateInput ${OPTARG}
                       \?) usage ;;
        shift $(($OPTIND -1))


10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting


I have a script that facillitates NDM (Connect::\Direct) transfer to remote hosts. This script uses getopts to parse through the parameters passed to it and to set appropriate variables based upon what was passed in. Kickoff="mv $PATH/$FILE1 $PATH/$FILE2" ndm_shell.ksh -p $Node -s $Source -d... (3 Replies)
Discussion started by: google
3 Replies

2. Shell Programming and Scripting

Help in getopts

Hi, My script will take a input file as a parameter(which is not mandatory) and also an option. ksh my_script.sh <inputfile> The option -n I have given is no way related to the input file. Now the problem here is when i execute the script specifying the input file and the option(the way... (4 Replies)
Discussion started by: chella
4 Replies

3. HP-UX

using getopts

Is there a restriction on levels of using 'getopts' ? I have several scripts, each of which requires an option as the first parameter . If I call one prg separately it works fine, but when one prg calls another prg and passes the option on the called prg, then the called prg seems not to process... (3 Replies)
Discussion started by: vslewis
3 Replies

4. Shell Programming and Scripting

Using getopts

I am having some trouble/questions with getopts that I can't find any solid info on with google I need it to parse things of the syntax of: -r # # # -f -c with as many repeats as possible, and it should catch erroneous commands also, but continue going... my first question is, -r... (3 Replies)
Discussion started by: TurboArkhan
3 Replies

5. UNIX for Dummies Questions & Answers


Hey, i need help with the use of getopts in shell script. tried reading a lot online, but found incomplete examples (maybe complete but cudn't make out). PLzz help...explain in deatil plzzz, i am a newbie:confused: (3 Replies)
Discussion started by: SasankaBITS
3 Replies

6. Shell Programming and Scripting

getopts help

First off, I apologize for my lack of knowledge. I realize my problem will probably seem pretty basic to everyone, but I've been at this for several hours now and I've gotten nowhere. I would contact my professor, but it is too late for that. Anyway, I'm trying to write a function called... (1 Reply)
Discussion started by: Unknown50862
1 Replies

7. Shell Programming and Scripting

Using getopts. Need help

Hi all... I have been looking on here for the past few days for an answer and Im gonna have to break down and ask. I just learned about the getopts command last week so have been trying to utilize it in my scripts. Below, I am trying to set up a case structure for options using getopts.... (1 Reply)
Discussion started by: losingit
1 Replies

8. UNIX for Dummies Questions & Answers


while getopts v OPTION do case $OPTION in v) echo "Hello" ;; *) exit 1;; esac done Suppose I have script tmp.sh Whose Signature is tmp.sh <fixed_argument> When I run the script with tmp.sh -v "file", it echoes a hello but, when I try the other way i.e, tmp.sh... (1 Reply)
Discussion started by: Devendra Hupri
1 Replies

9. Shell Programming and Scripting

Getopts help

Hi All, I am writing a script to pass the getopts argument to the function which I have. But it as soon as I execute the script, the argument is taking it as blank. I tried using multiple way to check but its not working. Can someone please let me know what wrong in this code. function1()... (4 Replies)
Discussion started by: sidh_arth85
4 Replies

10. Shell Programming and Scripting

Using getopts

Hi. Can somebody please show me an example of how to use getopts to assign a variable if it's been passed into the script but to set a default if no value has been passed in? And also how to handle a param with multiple values ... so a sub parse (can I use a function for this?)? Here's my code... (1 Reply)
Discussion started by: user052009
1 Replies
getoptcvt(1)							   User Commands						      getoptcvt(1)

getoptcvt - convert to getopts to parse command options SYNOPSIS
/usr/lib/getoptcvt [-b] filename /usr/lib/getoptcvt DESCRIPTION
/usr/lib/getoptcvt reads the shell script in filename, converts it to use getopts instead of getopt, and writes the results on the standard output. getopts is a built-in Bourne shell command used to parse positional parameters and to check for valid options. See sh(1). It supports all applicable rules of the command syntax standard (see Rules 3-10, intro(1)). It should be used in place of the getopt command. (See the NOTES section below.) The syntax for the shell's built-in getopts command is: getopts optstring name [ argument...] optstring must contain the option letters the command using getopts will recognize; if a letter is followed by a colon (:), the option is expected to have an argument, or group of arguments, which must be separated from it by white space. Each time it is invoked, getopts places the next option in the shell variable name and the index of the next argument to be processed in the shell variable OPTIND. Whenever the shell or a shell script is invoked, OPTIND is initialized to 1. When an option requires an option-argument, getopts places it in the shell variable OPTARG. If an illegal option is encountered, ? will be placed in name. When the end of options is encountered, getopts exits with a non-zero exit status. The special option -- may be used to delimit the end of the options. By default, getopts parses the positional parameters. If extra arguments (argument ...) are given on the getopts command line, getopts parses them instead. So that all new commands will adhere to the command syntax standard described in intro(1), they should use getopts or getopt to parse posi- tional parameters and check for options that are valid for that command (see the NOTES section below). OPTIONS
The following option is supported: -b Makes the converted script portable to earlier releases of the UNIX system. /usr/lib/getoptcvt modifies the shell script in file- name so that when the resulting shell script is executed, it determines at run time whether to invoke getopts or getopt. EXAMPLES
Example 1: Processing the arguments for a command The following fragment of a shell program shows how one might process the arguments for a command that can take the options -a or -b, as well as the option -o, which requires an option-argument: while getopts abo: c do case $c in a | b) FLAG=$c;; o) OARG=$OPTARG;; ?) echo $USAGE exit 2;; esac done shift `expr $OPTIND - 1` Example 2: Equivalent code expressions This code accepts any of the following as equivalent: cmd -a -b -o "xxx z yy" filename cmd -a -b -o "xxx z yy" -filename cmd -ab -o xxx,z,yy filename cmd -ab -o "xxx z yy" filename cmd -o xxx,z,yy b a filename ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of getopts: LC_CTYPE, LC_MESSAGES, and NLSPATH. OPTIND This variable is used by getoptcvt as the index of the next argument to be processed. OPTARG This variable is used by getoptcvt to store the argument if an option is using arguments. EXIT STATUS
The following exit values are returned: 0 An option, specified or unspecified by optstring, was found. >0 The end of options was encountered or an error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ SEE ALSO
intro(1), getopts(1), sh(1), shell_builtins(1), getopt(3C), attributes(5) DIAGNOSTICS
getopts prints an error message on the standard error when it encounters an option letter not included in optstring. NOTES
Although the following command syntax rule (see intro(1)) relaxations are permitted under the current implementation, they should not be used because they may not be supported in future releases of the system. As in the EXAMPLES section above, -a and -b are options, and the option -o requires an option-argument. The following example violates Rule 5: options with option-arguments must not be grouped with other options: example% cmd -aboxxx filename The following example violates Rule 6: there must be white space after an option that takes an option-argument: example% cmd -ab oxxx filename Changing the value of the shell variable OPTIND or parsing different sets of arguments may lead to unexpected results. SunOS 5.10 7 Jan 2000 getoptcvt(1)

Featured Tech Videos

All times are GMT -4. The time now is 12:28 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy