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Operating Systems HP-UX Difference between [condition] and [[condition]] and ((condition)) when used with if condition Post 302520128 by soumyabubun on Thursday 5th of May 2011 11:34:53 PM
Old 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
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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