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Top Forums UNIX for Dummies Questions & Answers outputting selected characters from within a variable Post 302361813 by skinnygav on Wednesday 14th of October 2009 09:17:34 AM
Old 10-14-2009
outputting selected characters from within a variable

Hi all,

if for example I had a variable containing the string 'hello', is the any way I can output, for example, the e and the 2nd l based on their position in the string not their character (in this case 2 and 4)?

any general pointers in the right direction will be much appreciated, at present i'm looking at awk but only seem to be able to find references to fields and lines.

thanks

skinnygav p.s. Using Bash shell by the way

---------- Post updated at 08:17 AM ---------- Previous update was at 06:00 AM ----------

I've solved this issue to an extent with

Code:
var1=hello
var2=3
echo $var1 | awk -F "" '{print $2}'

this will output the 2nd character e.

Is there any way I can modify this to output the character in the position stored in var2?

Code:
var1=hello
var2=3
echo $var1 | awk -F "" '{print $var2}'

does not work...
 

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MB_STRRPOS(3)								 1							     MB_STRRPOS(3)

mb_strrpos - Find position of last occurrence of a string in a string

SYNOPSIS
int mb_strrpos (string $haystack, string $needle, [int $offset], [string $encoding = mb_internal_encoding()]) DESCRIPTION
Performs a multibyte safe strrpos(3) operation based on the number of characters. $needle position is counted from the beginning of $haystack. First character's position is 0. Second character position is 1. PARAMETERS
o $haystack - The string being checked, for the last occurrence of $needle o $needle - The string to find in $haystack. o $offset - May be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string. o $encoding -The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used. RETURN VALUES
Returns the numeric position of the last occurrence of $needle in the $haystack string. If $needle is not found, it returns FALSE. CHANGELOG
+--------+---------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------+ | 5.2.0 | | | | | | | Added the optional parameter $offset. | | | | +--------+---------------------------------------+ NOTES
Note The $encoding parameter was moved from the third position to the fourth in PHP 5.2.0. For backward compatibility, $encoding can be specified as the third parameter, but doing so is deprecated and will be removed in the future. SEE ALSO
mb_strpos(3), mb_internal_encoding(3), strrpos(3). PHP Documentation Group MB_STRRPOS(3)
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