05-06-2011
Difference between [condition] and [[condition]] and ((condition)) when used with if condition
Executed the following if conditions .. and got different results .
only (( )) gave correct o/p with all scenarios .
Can anybody please let me know what is the difference between [condition] and [[condition]] and ((condition)) when used with if condition.
And why each condition gave different result.
1.
if [ 234 > 71 ];then
echo "correct"
else
echo "wrong"
fi
O/p : correct
2.
$if [[ 234 > 71 ]];then
echo "correct"
else
echo "wrong"
fi
o/p : wrong
3.
if [[ 234 > 700 ]];then
echo "correct"
else
echo "wrong"
fi
o/p : wrong
4.
if [ 234 > 700 ];then
echo "correct"
else
echo "wrong"
fi
o/p : correct
5.
$if (( 234 > 700 ));then
echo "correct"
else
echo "wrong"
fi
o/p : wrong
6.
if (( 234 > 71 ));then
echo "correct"
else
echo "wrong"
fi
o/p : correct
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
awk -F"#" '{if ($19~/^1A/) print $0}'
Please explain how "~/^1A/" is working.
Thanks in advance.....:) (1 Reply)
Discussion started by: tushar_tus
1 Replies
2. Shell Programming and Scripting
here is my script
########
#! /bin/sh
export PATH=$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
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
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
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
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
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
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
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
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 PHP
numfmt_set_text_attribute
NUMFMT_SET_TEXT_ATTRIBUTE(3) 1 NUMFMT_SET_TEXT_ATTRIBUTE(3)
NumberFormatter::setTextAttribute - Set a text attribute
Object oriented style
SYNOPSIS
public bool NumberFormatter::setTextAttribute (int $attr, string $value)
DESCRIPTION
Procedural style
bool numfmt_set_text_attribute (NumberFormatter $fmt, int $attr, string $value)
Set a text attribute associated with the formatter. An example of a text attribute is the suffix for positive numbers. If the formatter
does not understand the attribute, U_UNSUPPORTED_ERROR error is produced. Rule-based formatters only understand NumberFormat-
ter::DEFAULT_RULESET and NumberFormatter::PUBLIC_RULESETS.
PARAMETERS
o $fmt
-NumberFormatter object.
o $attr
- Attribute specifier - one of the text attribute constants.
o $value
- Text for the attribute value.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
numfmt_set_text_attribute(3) example
<?php
$fmt = numfmt_create( 'de_DE', NumberFormatter::DECIMAL );
echo "Prefix: ".numfmt_get_text_attribute($fmt, NumberFormatter::NEGATIVE_PREFIX)."
";
echo numfmt_format($fmt, -1234567.891234567890000)."
";
numfmt_set_text_attribute($fmt, NumberFormatter::NEGATIVE_PREFIX, "MINUS");
echo "Prefix: ".numfmt_get_text_attribute($fmt, NumberFormatter::NEGATIVE_PREFIX)."
";
echo numfmt_format($fmt, -1234567.891234567890000)."
";
?>
Example #2
OO example
<?php
$fmt = new NumberFormatter( 'de_DE', NumberFormatter::DECIMAL );
echo "Prefix: ".$fmt->getTextAttribute(NumberFormatter::NEGATIVE_PREFIX)."
";
echo $fmt->format(-1234567.891234567890000)."
";
$fmt->setTextAttribute(NumberFormatter::NEGATIVE_PREFIX, "MINUS");
echo "Prefix: ".$fmt->getTextAttribute(NumberFormatter::NEGATIVE_PREFIX)."
";
echo $fmt->format(-1234567.891234567890000)."
";
?>
The above example will output:
Prefix: -
-1.234.567,891
Prefix: MINUS
MINUS1.234.567,891
SEE ALSO
numfmt_get_error_code(3), numfmt_get_text_attribute(3), numfmt_set_attribute(3).
PHP Documentation Group NUMFMT_SET_TEXT_ATTRIBUTE(3)