Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Check for Empty Command Argument Post 302136751 by liketheshell on Wednesday 19th of September 2007 01:24:22 PM
Old 09-19-2007
You can try doing
if [ "$#" - ne 2 ] then

do something else.

fi

So if the first argument is passed to the script then there is no problem. If the second argument is not supplied then do something else. Hope that helps a bit.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

how to check if the argument contain wildcard (*,?) ?

In a script , i would like to check if the argument ( $1, $2 inside the script) contain wildcard (*,? etc). how do i do it? > script_name arg1 arg* $1 (arg1) does not contain wildcard, but $2 (arg* )contains wildcard. how can i tell in script? i need to do this is because : if arg1... (3 Replies)
Discussion started by: gusla
3 Replies

2. Shell Programming and Scripting

How can I make the for command check to see if a file is empty before executing?

Here is the command in question for f in $(<uploads); do . I only want this to execute if uploads is not empty. If uploads is empty I want the script to quit, actually before the for command. If its not apparent uploads is a text file. Chris (3 Replies)
Discussion started by: chrchcol
3 Replies

3. Shell Programming and Scripting

Check for empty string

Hello All, I have written shell script whcih at the max 3 parameters. When only one commandline argument and other two command line arguments are passed as empty string like eg : archive ' ' ' ' Then i need to check whether the commandline... (12 Replies)
Discussion started by: rahman_riyaz
12 Replies

4. Shell Programming and Scripting

check if file is empty

How do I check if a file is empty in a sh script I want to test in my shell script if the output file is empty and if it is do one thing and if it isnt empty do another? any ideas? (8 Replies)
Discussion started by: stolz
8 Replies

5. Shell Programming and Scripting

check whether the directory is empty or not

I have the list of users in user.log, under each user folder there is sub1 folder is there. i want to check whether sub1 is empty or not, if it is empty i have to skip that user user folder and iterate next user folders. i have the sample code,its not giving not proper results. while read line... (8 Replies)
Discussion started by: KiranKumarKarre
8 Replies

6. Shell Programming and Scripting

check empty directory !!!

I need to check if a directory is empty using an if condition in the pseudocode below if ; then else although i looked at a few forums on this topic, I left feeling a little unclear and i could not use the command successfully what can i substitute in the if conditon above,... (2 Replies)
Discussion started by: allah_waris45
2 Replies

7. Shell Programming and Scripting

Cannot compare argument in if statement in csh/grep command if argument starts with “-“

If ($argv == “-debug”) then Echo “in loop” Endif But this is not working. If I modify this code and remove “-“, then it works. Similarly I am getting problem using grep command also Grep “-debug” Filename Can someone please help me on how to resolve these... (1 Reply)
Discussion started by: sarbjit
1 Replies

8. Shell Programming and Scripting

How to check whether a variable is empty or contains some value?

hi, i want to check whether a a variable contains some value or is empty in a shell script. so if the variable contains some value i want to do some job and if the variable doesnt contain any value then i need to skip that job. here is a sample script read_filenames.sh contains ... (5 Replies)
Discussion started by: Little
5 Replies

9. Shell Programming and Scripting

Argument check

All, I'm writing an argument checking block and running into an error. I want to confirm that $1 is one of two values. Here is what I have: if ]; then echo -e "\nPlease check your first augument. You used \"$1\" which is not recognized. Please see usage:" usage ... (9 Replies)
Discussion started by: hburnswell
9 Replies

10. Shell Programming and Scripting

Cant check empty string

Hello So i have that script collection, in which i have a single script to create a configuration file. In there, i have multiple occourences of something like this: prj_title=$(tui-read "What is the TITLE? ($prj_name):") ] && prj_title="${prj_name/_/ }" They all work as expected, if... (5 Replies)
Discussion started by: sea
5 Replies
XMDS(1) 						User Contributed Perl Documentation						   XMDS(1)

NAME
xmds - the eXtensible Multi-Dimensional Simulator SYNOPSIS
xmds [options] <script_file> DESCRIPTION
The program xmds is a code generator that integrates equations. You write them down in human readable form in an XML file, and it goes away and writes and compiles a C++ program that integrates those equations as fast as it can possibly be done in your architecture. For information as to how to write a script for xmds, and how to solve problems in physics, mathematics and even finance and economics, read the associated pdf documentation available from the xmds web site: http://www.xmds.org. OPTIONS
-t, --template Output a template either to the terminal or to an optionally specified file -h, --help Display help and usage information -v, --verbose Turn on verbose information output -n, --nocompile Turn off automatic compilation of output code -d, --debug Turn on debugging information in processing of xmds script -x, --xmldebug Turn on debugging information in parsing of xml code FILES
Directory for storing fftw wisdom files: ${HOME}/.xmds/wisdom/ Preferences file: ${HOME}/.xmds/xmds.prefs or <path-to-script-directory>/xmds.prefs EXAMPLES
xmds nlse.xmds xmds -t new_xmds_file.xmds xmds --template > new_xmds_file.xmds AUTHORS
Originally written by Greg Collecutt Maintained by Paul Cochrane with code contributed by Joe Hope BUGS
No known bugs. SEE ALSO
xsil2graphics(1), loadxsil(1) COPYRIGHT
Copyright (C) 2000-2004 Code contributed by Greg Collecutt, Joseph Hope and Paul Cochrane This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. perl v5.8.2 2004-06-21 XMDS(1)
All times are GMT -4. The time now is 05:41 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy