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Top Forums Shell Programming and Scripting trying to use logical or and i must be missing something Post 302590813 by Corona688 on Tuesday 17th of January 2012 04:13:15 PM
Old 01-17-2012
That might actually have been a better way to do it.

The reason your first try didn't work because "or" wasn't really what you wanted. You flipped the logic with the !=, which changes the picture a bit -- a string can't possibly be equal 12 and 24 at the same time! One or the other, or both, will always be false, flipping that makes one or the other always true; and or-ing that produces a statement which is always true no matter what.

To do it with ||:

Code:
if [ "$CPUS" = "12" ] || [ "$CPUS" = "24" ]; then
:
else
        ...
fi

I think the -z is superfluous, then, since a null string will never equal 12 or 24.

Last edited by Corona688; 01-17-2012 at 05:20 PM..
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strcasecmp(3)						     Library Functions Manual						     strcasecmp(3)

NAME
strcasecmp, strncasecmp - Perform case-insensitive string comparisons LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <strings.h> int strcasecmp( const char *s1, const char *s2 int strncasecmp( const char *s1, const char *s2 size_t n; STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: strcasecmp(), strncasecmp(): XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Points to a location containing first string. Points to a location containing the second of two strings referenced. Specifies the maximum number of bytes to compare. DESCRIPTION
The strcasecmp() function compares the string pointed to by the s1 parameter to the string pointed to by the s2 parameter, while ignoring differences in case. The strncasecmp() function is similar to the strcasecmp function, but also compares size. If the size specified by n is reached before a null, the comparison stops. Note that these functions work for 7-bit ASCII compares only and should not be used in internationalized applications. RETURN VALUES
Upon completion, the strcasecmp() function returns an integer whose value is greater than, equal to, or less than 0 (zero), according to whether the s1 string, ignoring case, is greater than, equal to, or less than the s2 string. Upon successful completion, the strncasecmp() function returns an integer whose value is greater than, equal to, or less than 0 (zero), according to whether the s1 array (possibly null-terminated), ignoring case, is greater than, equal to, or less than the s2 string (possi- bly null-terminated). RELATED INFORMATION
Functions: string(3), strcat(3), strcmp(3), strcpy(3) Standards: standards(5) delim off strcasecmp(3)
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