Function prototype declaration Post: 302866627

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Top Forums Shell Programming and Scripting Function prototype declaration Post 302866627 by Corona688 on Tuesday 22nd of October 2013 12:40:37 PM

10-22-2013

Registered User

Quote:

Originally Posted by Balasankar

Isn't possibe to decare prototype kind of statement as we do in C++ ?

Nope.

C++ can do that because it's a compiled language. It can assume that "okay, there's a function named xyzzy, I can find its contents later". When the program gets linked together into an exe, it has to actually go find all these libraries to do so.

Shell language runs immediately with no compilation step. If those functions don't already exist, they don't exist. (A few shells might have special features here. These features do not exist in general.)

Even C++ can't manage if you don't tell it what the functions actually are though! At the very least you have to #include <something> before you use them, for it to even assume they exist. You can do something like #include in shell. Put your function, or a bunch of functions, in another file then do this:

Code:

. /path/to/script-name

Note the space between the dot and everything else, that's essential.

script-name will be run in your current shell, effectively loading the functions in it.

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shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)