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Full Discussion: String comparison tutorial not helpful
Top Forums Shell Programming and Scripting String comparison tutorial not helpful Post 302558273 by johnwdavis on Friday 23rd of September 2011 07:47:51 AM
Old 09-23-2011
String comparison tutorial not helpful
I have a bash string comparison which is not working, looked for help, and found this.

HTML Code:
= 
is equal to
if [ "$a" = "$b" ]
 
[IMG]http://www.tldp.org/LDP/abs/images/caution.gif[/IMG]Note the whitespace framing the =.
if [ "$a"="$b" ] is not equivalent to the above.
</DIV>
I do not find this to be helpful because I am asked to note the whitespace framing the = but am not told what its significance is.

The code which is not working is:

Code:
  if ["$TWI_IP" = "$TWJ_IP"]
                 then
                     PRO=1
                      echo we got an EQUAL!!!!!
                 else
                      echo we did not get an equal even though they are equal
                 fi

The string variables TWI_IP and TWJ_IP have equal contents but this code will always take the else branch.
 

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LEARN ABOUT PHP

strnatcasecmp

STRNATCASECMP(3)							 1							  STRNATCASECMP(3)

strnatcasecmp - Case insensitive string comparisons using a ";natural order" algorithm

SYNOPSIS

       int strnatcasecmp (string  $str1, string  $str2)

DESCRIPTION

	This  function	implements  a  comparison algorithm that orders alphanumeric strings in the way a human being would. The behaviour of this
       function is similar to strnatcmp(3), except that the comparison is not case sensitive. For more	information  see:  Martin  Pool's  Natural
       Order String Comparison page.

PARAMETERS

	      o $str1
		- The first string.

	      o $str2
		- The second string.

RETURN VALUES

	Similar  to  other string comparison functions, this one returns < 0 if $str1 is less than $str2 > 0 if $str1 is greater than $str2, and 0
       if they are equal.

SEE ALSO

       preg_match(3), strcmp(3), strcasecmp(3), substr(3), stristr(3), strncasecmp(3), strncmp(3), strstr(3), setlocale(3).

PHP Documentation Group 													  STRNATCASECMP(3)
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