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Full Discussion: Comparing Strings in ksh88
Top Forums Shell Programming and Scripting Comparing Strings in ksh88 Post 302827861 by clx on Monday 1st of July 2013 03:29:55 AM
Old 07-01-2013
Spaces on both side of "=" are necessary.

Code:
if [ $str1 == $str2 ]

I believe ksh88 uses single "=" syntax though not sure.

Code:
if [ $str1 = $str2 ]

Further, to avoid syntax error in case any variable is null, always quote the variables.

Code:
if [ "$str1" = "$str2" ]

Lastly, a safer way is,

Code:
if [ "x${str1}" = "x${str2}" ]

This User Gave Thanks to clx For This Post:
 

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strneqvcmp(3)							Programmer's Manual						     strneqvcmp(3)

NAME
strneqvcmp - compare two strings with an equivalence mapping SYNOPSIS
#include <your-opts.h> cc [...] -o outfile infile.c -lopts [...] int strneqvcmp(char const* str1, char const* str2, int ct); DESCRIPTION
Using a character mapping, two strings are compared for "equivalence". Each input character is mapped to a comparison character and the mapped-to characters are compared for the two NUL terminated input strings. The comparison is limited to ct bytes. This function name is mapped to option_strneqvcmp so as to not conflict with the POSIX name space. str1 first string str2 second string ct compare length RETURN VALUE
the difference between two differing characters ERRORS
none checked. Caller responsible for seg faults. SEE ALSO
The info documentation for the -lopts library. ao_string_tokenize(3), configFileLoad(3), optionFileLoad(3), optionFindNextValue(3), optionFindValue(3), optionFree(3), optionGetValue(3), optionLoadLine(3), optionNextValue(3), optionOnlyUsage(3), optionProcess(3), optionRestore(3), optionSaveFile(3), optionSaveState(3), optionUnloadNested(3), optionVersion(3), pathfind(3), strequate(3), streqvcmp(3), streqvmap(3), strtransform(3), 2010-07-05 strneqvcmp(3)
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