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Full Discussion: Variable issues
Top Forums Shell Programming and Scripting Variable issues Post 302250771 by bert682 on Friday 24th of October 2008 07:47:31 AM
Old 10-24-2008
Variable issues
Hey guys,

I have just started getting into shell scripting, ive been self educating myself with it and have run into a snag.

I am trying to make a very simple addition script. The script would be passed a number of parameters (numbers) and it would add them all together. I can do this fine when there is a set number of parameters but when they are undefined I have trouble.

Here is what I have so far and its output.

Code:
#!/bin/csh

if ( $#argv <= 1 ) then
   echo Usage: 2 parameters are required
   exit 1
endif

echo $#argv numbers were entered

set totalparameters = $#argv

  @ sum = $1 + $2

while ($totalparameters > 0)
  shift
  @ totalparameters --
  @ sum = $sum + $2
  echo $sum
end

Code:
robert-desktop:~/bin> argvexample 1 2 3 2
4 numbers were entered
6
8
@: Expression Syntax.
robert-desktop:~/bin>

It is adding the numbers but its throwing an error. Im totally lost.

If you can help I would really appreciate it. Thanks in advance.
 

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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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