evaluating variables Post: 56618

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Top Forums UNIX for Dummies Questions & Answers evaluating variables Post 56618 by Bab00shka on Wednesday 6th of October 2004 11:43:43 AM

10-06-2004

Registered User

Hi ZB

The contents of file doesn't really have any bearing on the question and is probably misleading. I'll try to phrase the question a bit differently.

I am trying to build up a dynamic string using a loop. I know the example script below is a bit pointless but hopefully it explains a little more clearly what I'm trying to do.

#!/usr/bin/ksh

counter=1
cmd="awk"
field1="Fred"
field2="Joe"
field3="Mary"
field4="Jane"

while [ $counter -le 4 ]
do
cmd=$cmd" -vvar$counter=$field$counter"

(( counter = counter + 1 ))
done

What I wanted to get is the contents of the variable 'cmd' to literally equal 'awk -vvar1=Fred -vvar2=Joe -vvar3=Mary -vvar4=Jane'

To do this I would need the $counter part of -vvar$counter to be evaluated to -vvar1, -vvar2 etc, but for the $field$counter I would need the variable evaluated twice. Firstly to $field1, $field2 etc then to the contents of $field1 (Fred), $field2 (Joe) etc

I hope this explains what I'm trying to achieve.

Cheers
Helen

Bab00shka

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LEARN ABOUT SUNOS

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/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/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

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

FILES

       /etc/shells	       lists shells on system

SEE ALSO

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

SunOS 5.10							    4 Jun 2001								 shells(4)

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