Dot sourcing differences in ksh, AIX vs Linux vs Solaris Post: 302887764

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Top Forums UNIX for Advanced & Expert Users Dot sourcing differences in ksh, AIX vs Linux vs Solaris Post 302887764 by bakunin on Monday 10th of February 2014 05:17:53 PM

02-10-2014

Registered User

Quote:

Originally Posted by jim mcnamara

Do you have ksh88 or ksh93 on AIX?

"ksh" in AIX is a ksh88 which is unchanged since i work with AIX (v 3.2.3, ~1992), which is pretty long. To get a ksh93 you have to call "ksh93" explicitly.

One question i have for charles, though: why is it necessary to source anything? Why don't you use the "FPATH" variable and put your functions into a common path, similarly to a shared library?

FPATH works like the PATH, but for KornShell functions. put all your functions into separate files named the same as the function: if FPATH is set to "/foo/bar" the file "/foo/bar/boom" will contain the sole function "boom()". I use this for all my scripts in conjunction with a variable "DEVELOP", which switches between a copy of the library in my HOME and the common library. This way i can modify the lib functions without interrupting the production code:

Code:

#! /usr/bin/ksh

if [ -z "$DEVELOP" ] ; then
     . /usr/local/lib/ksh/StdEnv
else
     . ~/lib/StdEnv
fi

.... rest of the script

file /usr/local/lib/ksh/StdEnv contains:

Code:

if [ -z $DEVELOP ] ; then
     FPATH=/usr/local/lib/ksh
else
     FPATH=~/lib/ksh
fi

FOO=bar
...            # and all sorts of other environment settings

In my personal profile "$DEVELOP" is set so that scripts called with my user always use the local copy of the lib (or i unset it to use the common copy), all scripts started with non-personal users have "$DEVELOP" not set and therefore use the common library.

I hope this helps.

bakunin

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LEARN ABOUT OPENSOLARIS

let

let(1)								   User Commands							    let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

   ksh93
       let [expr...]

DESCRIPTION

   ksh
       Each arg is a separate arithmetic expression to be evaluated.

   ksh93
       let  evaluates  each expr in the current shell environment as an arithmetic expression using ANSI C syntax. Variables names are shell vari-
       ables and they are recursively evaluated as arithmetic expressions to get numerical values. let has been made obsolete by the ((...))  syn-
       tax of ksh93(1) which does not require quoting of the operators to pass them as command arguments.

EXIT STATUS

   ksh
       ksh returns the following exit values:

       0    The value of the last expression is non-zero.

       1    The value of the last expression is zero.

   ksh93
       ksh93 returns the following exit values:

       0     The last expr evaluates to a non-zero value.

       >0    The last expr evaluates to 0 or an error occurred.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), ksh93(1), set(1), typeset(1), attributes(5)

SunOS 5.11							    2 Nov 2007								    let(1)

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