Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Difference between [condition] and [[condition]] and ((condition)) when used with if condition
Operating Systems HP-UX Difference between [condition] and [[condition]] and ((condition)) when used with if condition Post 302520345 by methyl on Friday 6th of May 2011 01:03:21 PM
Old 05-06-2011
Within "man sh-posix" see the section on "Conditonal Expressions" for the explanation of conditions within [[ ]] .
See "man test" for an explanation of "Test" within [ ] .
Though there is some common syntax between a "Conditional Expression" and a "Test" there is also much syntax which is exclusive. For example the AND and OR operators are quite different.
As far as I know, there is no ">" operator.

I have never found use for (( )) as an Arithmetic Test and cannot comment. Others may have seen it used.


BEWARE. The ">" sign you are using is not valid syntax. Your test scripts may not be doing what you expect.
Quote:
if [ 234 > 71 ];then
echo "correct"
else
echo "wrong"
fi
The above script creates a FILE called "71" and the "if" test is "true" because this process worked.
Suggest you check all your examples for this problem and check the directory list after each try!
Last edited by methyl; 05-06-2011 at 02:10 PM..
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

help with if condition.

Hi, awk -F"#" '{if ($19~/^1A/) print $0}' Please explain how "~/^1A/" is working. Thanks in advance.....:) (1 Reply)
Discussion started by: tushar_tus
1 Replies

2. Shell Programming and Scripting

If condition

here is my script ######## #! /bin/sh export PATH=$PATH:/opt/mysql/bin/ #echo $PATH echo $LD_LIBRARY_PATH USER="root" PASS="xyz" DB="sme" DATE=$(date +%d%b%y_%k.%M.%S) #DATE=`date +%y-%d-%m` if mysqldump -u $USER -p$PASS $DB | gzip -9>/home/backup1/today_sme-$DATE.sql.gz then find... (10 Replies)
Discussion started by: kaushik02018
10 Replies

3. Shell Programming and Scripting

Use of condition with if...

hi all, I am writing a shell script in ksh.Scenerio is I am exporting a result set from teradata to a file and comparing its result with my assigend varaible.but this comaprison is not happening.I give my script here... set -x record=/tmp/error.txt count=/tmp/cnt.txt chmod 777 $count... (2 Replies)
Discussion started by: kapil chauhan
2 Replies

4. Shell Programming and Scripting

help with if condition

I do have a situation where , i need to zip the log files in the directory when the file exceeds more than 10MB. cd $ORACLE_HOME/network/log find . -type f -name "listener_*.log" > listeners Now i have all my *.log files listed in the listeners file So now i need to find the size of each... (5 Replies)
Discussion started by: naveen529
5 Replies

5. Shell Programming and Scripting

redirect stdout echo command in condition A run in condition B

hi, I have some problems in my simple script about the redirect echo stdout command inside a condition. Why is the echo command inside the elif still execute in the else command Here are my simple script After check on the two diff output the echo stdout redirect is present in two diff... (3 Replies)
Discussion started by: jao_madn
3 Replies

6. Shell Programming and Scripting

If condition

I am trying trying to find the percentage and compare it with a value. But even if the condition is not true the also it is taking the true value not the else value. x=`awk '{print $2}' out2.txt` y=`awk '{print $4}' out2.txt` z=$((100*$y/$x)) if ;then echo "high" else echo "low"... (2 Replies)
Discussion started by: arijitsaha
2 Replies

7. Shell Programming and Scripting

if condition

if chr1:109457160 1 109457160 99.1735537190083 + chr1:109457233 1 109457233 99.1735537190083 - chr1:109457614 1 109457614 99.1735537190083 + chr1:109457618 1 109457618 100 + chr1:109457943 1 109457943 100 - chr1:109458224 1 109458224 99.1735537190083 - file1.txt If 6th column in... (3 Replies)
Discussion started by: johnkim0806
3 Replies

8. Shell Programming and Scripting

If condition return 0 even when it fails to satisfy te condition

HI My doubt may be basic one but I need to get it clarified.. When i use "if" condition that checks for many AND, OR logical conditions like if ]; then return 0 fi Even the if condition fails it returns as zero.. Any clue.. But if i add else condition like if ]; ... (2 Replies)
Discussion started by: Priya Amaresh
2 Replies

9. Shell Programming and Scripting

Using if condition

Hello, I want to use if condition in an expression as below: $ORACLE_HOME is a variable something like below /oraprod04_01/app/oracle/product/10204 Now here it is product/10204 I want to check if $ORACLE_HOME has something which has a string like /product/10* then one statement should... (4 Replies)
Discussion started by: Vishal_dba
4 Replies

10. Shell Programming and Scripting

awk to update file with numerical difference if condition is met

In the file1 below if $9 and $12 are . (dot) then the value in $8 of file1 is used as a key (exact match) to lookup in each $2 of file2, when a match is found then the value of $4 in file1 is used to look for a range match within +/- 50 using the values in $4 and after in file2. The number of... (9 Replies)
Discussion started by: cmccabe
9 Replies

LEARN ABOUT REDHAT

pthread_condattr_init

PTHREAD_CONDATTR(3)					     Library Functions Manual					       PTHREAD_CONDATTR(3)

NAME

       pthread_condattr_init, pthread_condattr_destroy - condition creation attributes

SYNOPSIS

       #include <pthread.h>

       int pthread_condattr_init(pthread_condattr_t *attr);

       int pthread_condattr_destroy(pthread_condattr_t *attr);

DESCRIPTION

       Condition  attributes  can  be  specified  at  condition  creation  time,  by  passing  a  condition attribute object as second argument to
       pthread_cond_init(3).  Passing NULL is equivalent to passing a condition attribute object with all attributes set to their default values.

       The LinuxThreads implementation supports no attributes for conditions. The functions on condition attributes are included only for  compli-
       ance with the POSIX standard.

       pthread_condattr_init  initializes  the	condition attribute object attr and fills it with default values for the attributes.  pthread_con-
       dattr_destroy destroys a condition attribute object, which must not be reused until it is reinitialized. Both functions do nothing  in  the
       LinuxThreads implementation.

RETURN VALUE

       pthread_condattr_init and pthread_condattr_destroy always return 0.

AUTHOR

       Xavier Leroy <Xavier.Leroy@inria.fr>

SEE ALSO

       pthread_cond_init(3).

								   LinuxThreads 					       PTHREAD_CONDATTR(3)
All times are GMT -4. The time now is 03:02 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy