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Top Forums UNIX for Dummies Questions & Answers How to pass command line argument in shell script? Post 302848743 by Don Cragun on Friday 30th of August 2013 02:01:31 AM
Old 08-30-2013
Quote:
Originally Posted by Nsharma3006
I have not started yet because I dont know how to start for writing command line argument.

I am searching if I can find the code for the same.

---------- Post updated at 08:37 PM ---------- Previous update was at 04:07 PM ----------

Can anyone help how to write I m new to script writing

---------- Post updated at 09:36 PM ---------- Previous update was at 08:37 PM ----------

I need to run a script like
Code:
./script.ksh 01/02

if I run just like this
Code:
./script.ksh

then It should thru error message like invalid option and exit from the script
You're probably not getting much help here because this sounds more like a homework item placed in the wrong forum and not using the correct format for a homework assignment.

If you really are trying to learn how to write shell programs on your own, we need more details to understand what you're trying to do.

Options are generally introduced by a leading minus sign (or less commonly, a leading plus sign), your example doesn't include either one.

An error message like "invalid option" implies that you are processing options (rather than operands) and that there are "valid" and "invalid" options. What determines whether an option is valid or invalid?
 

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exit(1) 							   User Commands							   exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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