LinuxQuestions.org
Register a domain and help support LQ
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices

Reply
 
Search this Thread
Old 02-12-2009, 07:09 AM   #1
bioinformatics_guy
Member
 
Registered: Aug 2008
Posts: 54

Rep: Reputation: 15
Command line arguments


I'm writing a shell script that takes 2 command line arguments (which happen to be integers).

./script.sh 4 5

How can I test to make sure there are two arguments and if there is more/less then to inform the user?
 
Old 02-12-2009, 07:16 AM   #2
Maligree
Member
 
Registered: Mar 2008
Distribution: Gentoo, CentOS, Fedora, Arch
Posts: 231
Blog Entries: 1

Rep: Reputation: 42
The number of arguments is stored in the $# variable. Try a simple script with echo $# and see for yourself.
 
Old 02-12-2009, 07:26 AM   #3
David the H.
Bash Guru
 
Registered: Jun 2004
Location: Osaka, Japan
Distribution: Debian sid + kde 3.5 & 4.4
Posts: 6,823

Rep: Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947Reputation: 1947
Maybe try something like

Code:
if [ ${#@} -ne 2 ] ; then

     echo "wrong number of arguments"

fi
${#@} (or $# in the simple form as mentioned above) = the number of positional parameters. See the ABSG reference card.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
need some help regarding command line arguments kristam269 Linux - General 1 01-23-2007 09:40 AM
command line arguments nickraj Programming 6 09-11-2006 01:01 PM
Command line arguments?? almagerenia Linux - Newbie 1 09-08-2006 04:05 AM
command line arguments containing ( Lotharster Linux - Newbie 3 01-05-2006 08:43 AM
Help with command line arguments ? synapse Linux - Newbie 2 02-23-2004 02:25 AM


All times are GMT -5. The time now is 11:49 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration