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Full Discussion: Comparing the characters of 2 variables
Top Forums UNIX for Dummies Questions & Answers Comparing the characters of 2 variables Post 302557195 by Corona688 on Tuesday 20th of September 2011 02:49:31 PM
Old 09-20-2011
OK.

Since you have bash, you have string operations, so:

Code:
#!/bin/bash

STR="kitten"
GUESS="${STR//[a-z]/_}" # Replace all [a-z] with _

while [ "$GUESS" != "$STR" ]
do
        IN=""
        while [ "${#IN}" -ne 1 ] || [ ! -z "${IN/[a-z]}" ]
        do
                printf "${GUESS} Enter a character, then ENTER: "
                read IN
        done

        # Loop through every character in $STR.
        for((N=0; N<${#STR}; N++))
        do
                if [ "${STR:$N:1}" = "$IN" ]
                then
                        if [ "${GUESS:$N:1}" = "$IN" ]
                        then
                                echo "You already guessed that!"
                                break;
                        fi
                        # i.e. replacing the first 't' in kitten.
                        # ${GUESS:0:$N} gets 'ki'.
                        # ${GUESS:$((N+1))} gets 'ten'.
                        # We stick our guess, $IN, in the middle.
                        GUESS="${GUESS:0:$N}${IN}${GUESS:$((N+1))}"
                fi
        done
done

echo "You got it!  $GUESS"

This User Gave Thanks to Corona688 For This Post:
lsecer
 

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LEARN ABOUT XFREE86

config.guess

CONFIG.GUESS(1) 						   User Commands						   CONFIG.GUESS(1)

NAME

       config.guess - guess the build system triplet

SYNOPSIS

       config.guess [OPTION]

DESCRIPTION

       The GNU build system distinguishes three types of machines, the `build' machine on which the compilers are run, the `host' machine on which
       the package being built will run, and, exclusively when you build a compiler, assembler etc., the `target' machine, for which the  compiler
       being built will produce code.

       This script will guess the type of the `build' machine.

       Output the configuration name of the system `config.guess' is run on.

   Operation modes:
       -h, --help
	      print this help, then exit

       -t, --time-stamp
	      print date of last modification, then exit

       -v, --version
	      print version number, then exit

ENVIRONMENT VARIABLES

       config.guess  might  need  to  compile  and  run  C  code,  hence it needs a compiler for the `build' machine: use the environment variable
       `CC_FOR_BUILD' to specify the compiler for the build machine.  If `CC_FOR_BUILD' is not specified, `CC' will be used.  Be sure  to  specify
       `CC_FOR_BUILD' is `CC' is a cross-compiler to the `host' machine.

	 CC_FOR_BUILD	 a native C compiler, defaults to `cc'
	 CC		 a native C compiler, the previous variable is preferred

REPORTING BUGS

       Report bugs and patches to <config-patches@gnu.org>.

       Originally written by Per Bothner.
       Copyright 1992-2016 Free Software Foundation, Inc.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1).

GNU Autoconf 2.69						    August 2017 						   CONFIG.GUESS(1)
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