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Top Forums Shell Programming and Scripting Strange third argument in shell function Post 303001039 by digioleg54 on Tuesday 25th of July 2017 02:54:04 PM
Old 07-25-2017
Strange third argument in shell function

In one of my shell function I found the following

Code:
 set_default_values () {
         prog=$1
        PROC_DT=$2
        RESET_ALL="${3-N}"
        #echo "Processing date as passed = [$2], Program name = [$1]"
......

I understand the first and second arguments, but don't understand what is
Code:
 RESET_ALL="${3-N}"

I know that I send only two arguments, why do I need third? If I don't send it. And why is it strange N letter? The code is very old and I am converting it to Perl now

Thanks for contribution
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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