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Full Discussion: Reverse of a string
Top Forums Shell Programming and Scripting Reverse of a string Post 302558501 by Corona688 on Friday 23rd of September 2011 05:29:59 PM
Old 09-23-2011
Everything inside single quotes there gets fed into awk literally. So it gives awk $0, not the first argument.

awk considers $0 to be the entire line.

You can simplify that a bit by setting FS="", which makes each field its own character:

Code:
echo "slartibartfast" | awk -v FS="" '{ for(N=NF; N>=1; N--) printf("%s", $N); }'


Last edited by Corona688; 09-23-2011 at 06:36 PM..
 

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STRLEN(3)								 1								 STRLEN(3)

strlen - Get string length

SYNOPSIS
int strlen (string $string) DESCRIPTION
Returns the length of the given $string. PARAMETERS
o $string - The string being measured for length. RETURN VALUES
The length of the $string on success, and 0 if the $string is empty. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Prior versions treated arrays as the string | | | Array, thus returning a string length of 5 and | | | emitting an E_NOTICE level error. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 A strlen(3) example <?php $str = 'abcdef'; echo strlen($str); // 6 $str = ' ab cd '; echo strlen($str); // 7 ?> NOTES
Note strlen(3) returns the number of bytes rather than the number of characters in a string. Note strlen(3) returns NULL when executed on arrays, and an E_WARNING level error is emitted. SEE ALSO
count(3), grapheme_strlen(3), iconv_strlen(3), mb_strlen(3). PHP Documentation Group STRLEN(3)
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