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Top Forums Shell Programming and Scripting Verify the variable has "space" or not? Post 302669681 by methyl on Wednesday 11th of July 2012 08:02:43 AM
Old 07-11-2012
Please post what Operating System you have and what Shell you use.

If you are validating a field, it is better to work from a list of valid characters.
What are the valid characters?


If you just want to count the characters, one trick is to delete everything except that character, then count what's left:

Code:
# Counting space characters
echo "abc def"|tr -cd " "|wc -c
1
echo "abcdef"|tr -cd " "|wc -c
0
# Counting "a" characters
echo "abc def"|tr -cd "a"|wc -c
1
echo "abcdef"|tr -cd "a"|wc -c
1


@pamu
The grep -c command counts lines not characters.
 

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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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