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Full Discussion: compare versions.
Top Forums Shell Programming and Scripting compare versions. Post 302537976 by pludi on Monday 11th of July 2011 09:49:51 AM
Old 07-11-2011
Since they're not pure numbers, Perl is treating them like strings, and then the comparison follows the rules of the strcmp function. The first and second character in both are the same, but the third is different, and 1 comes before 9, and is thus considered lower.
 

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strcmp(9F)						   Kernel Functions for Drivers 						strcmp(9F)

NAME
strcmp, strcasecmp, strncasecmp, strncmp - compare two null-terminated strings. SYNOPSIS
#include <sys/ddi.h> int strcmp(const char *s1, const char *s2); int strcasecmp(const char *s1, const char *s2); int strncasecmp(const char *s1, const char *s2, size_t n); int strncmp(const char *s1, const char *s2, size_t n); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). PARAMETERS
s1, s2 Pointers to character strings. n Count of characters to be compared. DESCRIPTION
strcmp() strcmp() returns 0 if the strings are the same, or the integer value of the expression (*s1 - *s2) for the last characters compared if they differ. strcasecmp(), strncasecmp() The strcasecmp() and strncasecmp() functions are case-insensitive versions of strcmp() and strncmp(), respectively, described in this sec- tion. They assume the ASCII character set and ignore differences in case when comparing lowercase and uppercase characters. strncmp() strncmp() returns 0 if the first n characters of s1 and s2 are the same, or (*s1 - *s2) for the last characters compared if they dif- fer. RETURN VALUES
strcmp() returns 0 if the strings are the same, or (*s1 - *s2) for the last characters compared if they differ. strcasecmp() and strncasecmp() return values in the same fashion as strcmp() and strncmp(), respectively. strncmp() returns 0 if the first n characters of strings are the same, or (*s1 - *s2) for the last characters compared if they differ. CONTEXT
These functions can be called from user or interrupt context. SEE ALSO
Writing Device Drivers SunOS 5.10 1 Apr 1994 strcmp(9F)
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