Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: test expr VS [ expr ]
Top Forums Shell Programming and Scripting test expr VS [ expr ] Post 302377094 by ashok.g on Thursday 3rd of December 2009 06:17:44 AM
Old 12-03-2009
test expr VS [ expr ]
What is the difference between test expr VS [ expr ].
For example :
Code:
if test 5 -eq 6
echo "Wrong"

and
Code:
if [ 5 -eq 6 ]
echo "Wrong"

bot will give the same output as Wrong.
Now, what is the difference between these two? though they are producing the same result why we need two?

Any answer will be appreciated,
Last edited by pludi; 12-03-2009 at 07:21 AM.. Reason: code tags, please...
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

expr

Hello! I want to evaluate some mathematical expressions in a script and I try to use 'expr' command. Unfortunatally, when I have, for example, expr 8.2 + 6 the result is 'expr: non-numeric argument' Why ? I work on SunOs 5.7. Thanks in advance Nathe (5 Replies)
Discussion started by: Nathe
5 Replies

2. UNIX for Dummies Questions & Answers

using the expr command

Hi friends how can i execute expr $va1 * $var2 provided i m not supposed to use '/' also the nglob variable is turned off. (4 Replies)
Discussion started by: ashishj
4 Replies

3. Red Hat

how to use expr

i am new to shell programming, currently using redhat linux of version 2.4.20-8. i have problem in executing expr command in the following shell script $ x=5 $ x='expr $x + 1' $ echo $x the output is displaying always expr $x + 1 Pls guide me for the above query (3 Replies)
Discussion started by: saikumarm80
3 Replies

4. Shell Programming and Scripting

the expr \*

$ cat > mtable #!/bin/sh # #Script to test for loop # # if then echo "Error - Number missing form command line argument" echo "Syntax : $0 number" echo "Use to print multiplication table for given number" exit 1 fi n=$1 for i in 1 2 3 4 5 6 7 8 9 10 do echo "$n * $i = `expr $i \*... (1 Reply)
Discussion started by: jackel7777
1 Replies

5. UNIX for Dummies Questions & Answers

expr ?!

Hey there i want to subtract the content from $b from $a. Each variable has got 18 values (normal numbers from 0 - 99). How can i subtract them? I know i have to use the expr command, this is what i have till now: a=`cat Tabelle.dat | awk {'print $4'} | awk -F: {'print $1'}` b=`cat... (1 Reply)
Discussion started by: Mad van Bert
1 Replies

6. UNIX for Dummies Questions & Answers

Performance of let and expr

i have been told that 'let' is faster than 'expr' in terms of performance. Is this correct? if yes, why is it so? i am not able to see any performance difference in small arithmetic operations. Thanks (3 Replies)
Discussion started by: pandeesh
3 Replies

7. Shell Programming and Scripting

Error with expr - "expr: syntax error"

Hi All, I'm writing a shell script in KSH, where I want to store the filename, total record count and actual record count of all the source files. The source files reside in 4 different sub-folders under the same root folder. Below is code: #!/usr/bin/ksh... (6 Replies)
Discussion started by: jagari
6 Replies

8. UNIX for Dummies Questions & Answers

Issues with 'expr'

Hi, I have a text file where i define all the inputs to my shell script: IP=1.2.3.4 PC=1234 In the shell script, i am trying to read the input variables from the above mentioned text file: #!/bin/bash #usage IP=expr cat /tmp/input.txt | grep IP| cut -d "=" -f2 PC=expr cat... (4 Replies)
Discussion started by: akarnya
4 Replies

9. Shell Programming and Scripting

If + expr

Hi I have bellow script: t1=`cat node1.txt | grep thread1 | cut -f2 -d '-'` t2=`cat node2.txt | grep thread2 | cut -f2 -d '-'` t3=`cat node1_rcat.txt | grep thread1 | cut -f2 -d '-'` t4=`cat node2_rcat.txt | grep thread2 | cut -f2 -d '-'` if ]; then echo "no restore" >> log.log... (6 Replies)
Discussion started by: primo102
6 Replies

10. Shell Programming and Scripting

Nn$( expr $n + 1)

HI there I am trying to understand Shell scripting to create my own, I am attempting a few examples can anyone tell me what this means?n=$( expr $n + 1)Tried looking on the internet, but just cannot find its anywhere :( .Help please (4 Replies)
Discussion started by: steve2015
4 Replies

LEARN ABOUT MOJAVE

locale::codes::langfam5.18

Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a
       constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.18.2							    2013-11-04					       Locale::Codes::LangFam(3pm)
All times are GMT -4. The time now is 10:06 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy