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Full Discussion: UNIX script -- case
Top Forums Shell Programming and Scripting UNIX script -- case Post 302764905 by SSUUser on Friday 1st of February 2013 06:08:33 AM
Old 02-01-2013
Quote:
Originally Posted by Scrutinizer
You could of course use trickery and process the number as if it were a string and do something like this:

Code:
case $1 in  
  [1-9]*) echo greater than or equal to 1 ;;
       *) echo less or equal
esac

That would work, but it would make the code less straight forward / more difficult to read and understand...
oh...that is nice ! um.. I am still a beginner. Is there a logical problem ?
Is [1-9]* = * ? If yes , whatever input , two arguments will be output

---------- Post updated at 06:08 AM ---------- Previous update was at 06:01 AM ----------

Quote:
Originally Posted by Scrutinizer
You could of course use trickery and process the number as if it were a string and do something like this:

Code:
case $1 in  
  [1-9]*) echo greater than or equal to 1 ;;
       *) echo less or equal ;;
esac

That would work if $1 is always a number, but it would make the code a bit less straight forward / more difficult to read and understand...
i try it and it is work . thanks a lot .
that little strange for me [1-9]* is not equal to *
 

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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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