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Full Discussion: difference between = and ==
Top Forums Shell Programming and Scripting difference between = and == Post 302418374 by dips_ag on Tuesday 4th of May 2010 05:32:54 AM
Old 05-04-2010
difference between = and ==

Hi,

I don't understand the difference between

Code:
 
if [[ $string1 = $string2 ]] 
and
if [[ $string1 == $string2 ]]

for me

Code:
 
#!/usr/bin/ksh
string1=test1
string2=test2
if [[ $string1 == string2 ]];then OR if [[ $string1 = string2 ]];then 
echo "strings are same"
else
echo "strings are different"
fi

they both do the same job. Am I doing something wrong? Please explain.

-dips
 

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SSAStringCpy(3SNMP)					      SNMP Library Functions					       SSAStringCpy(3SNMP)

NAME
SSAStringCpy, SSAStringInit, SSAStringToChar, SSAStringZero - Sun Solstice Enterprise Agent string helper functions SYNOPSIS
cc [ flag ... ] file ... -lssasnmp [ library .. ] #include <impl.h> void *SSAStringZero(String *string); int SSAStringInit(String *string, uchar_t *chars, int len, char *error_label); int SSAStringCpy(String *string1, String *string2, char *error_label); char *SSAStringToChar(String string); DESCRIPTION
The SSAStringCpy() function makes a deep copy of string2 to string1. This function assumes that string1 has been processed by the SSAS- tringZero() function. Memory is allocated inside the string1 and the contents of string2, not just the pointer, is copied to the string1. If an error is encountered, an error message is stored in the error_label buffer. The SSAStringInit() function copies the char array from chars to the string instance with the specified length len. This function assumes that the string instance has been processed by the SSAStringZero() function or no memory is allocated inside the string instance. If an error is encountered, an error message is stored in the error_label buffer. The SSAStringToChar() function returns a temporary char array buffer for printing purposes. The SSAStringZero() function frees the memory inside of the String instance, but not the string object itself. RETURN VALUES
The SSAStringInit() and SSAStringCpy() functions return 0 if successful and -1 if error. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) SunOS 5.10 17 Dec 1996 SSAStringCpy(3SNMP)
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