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Reading from standard input

 
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Old 07-22-2011
Reading from standard input
So, I am new to shell scripting and have a few problems.
I know how to read from standard input but I do not know how to really compare it to say, a character. I am trying to compare it to a character and anything exceeding just a character, the user will get an output message, but the program goes on.

I tried using test with regular expressions after taking an input like this.

Code:
read input

while test $input != q || test -z $input
do
        if test $input = n
        then
 ...

I also want my program to move on if the input just presses enter, but I get two error messages on the while statement and the if statement saying unary operator expected.
 
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LEARN ABOUT SUSE

strneqvcmp

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)