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Top Forums Shell Programming and Scripting Is there a better way I could have run this loop. (For loop with two variables) Post 302301448 by DeCoTwc on Thursday 26th of March 2009 11:09:51 PM
Old 03-27-2009
Is there a better way I could have run this loop. (For loop with two variables)

Sorry for such a dreadful title, but I'm not sure how to be more descriptive. I'm hoping some of the more gurutastic out there can take a look at a solution I came up with to a problem, and advice if there are better ways to have gone about it.

To make a long story short around 20K pieces of equipment de-registered, and the only way to re-register them relies on using a manual script that needs the equipments MAC address and IP address. Unfortunately there is no current way to run the script against a file with the information. So I decided that a loop would be the best way to go about it.

What I wound up doing was creating a pipe delimited file with the equipment info, and running the following against it:

Code:
[mystro@mys-nycnm-srv01 scripts]$ head -5 IP
00:0F:21:FE:29:67|10.130.192.173
00:0F:21:FE:2D:57|10.140.66.207
00:0F:21:FE:2E:21|10.153.200.37
00:0F:21:FE:2E:88|10.141.146.134
00:0F:21:FE:2E:CA|10.157.206.8

[mystro@mys-nycnm-srv01 scripts]$ for i in `cat IP`;do mac=$(echo "$i"|cut -f1 -d\|);ip=$(echo "$i"|cut -f2 -d\|);/usr/local/mystro/scripts/mdiags cid reg $mac $ip;done

It worked perfectly, but as I'm (obviously) not the most skilled scripter I always like to hear critiques from more experienced people.

IE: Should I have not used echo...is there an easier way to isolate the info than cut...etc.
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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