Very ANNOYING Problem - Please Help Post: 302174939

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Top Forums Shell Programming and Scripting Very ANNOYING Problem - Please Help Post 302174939 by shadow0001 on Wednesday 12th of March 2008 04:29:40 PM

03-12-2008

Registered User

Very ANNOYING Problem - Please Help

Hey Guys

I have an extremely annoying problem with regular expressions! At this point i believe the command 'read' is causing the problem due to the carriage return it places once its done.

I have an continuous loop until the input is correct: (After initial read statement)

Code:

while [ 0 ]
        do
                if [[ "$word" == [a-z]+ ]]
                then
                        word=$(echo $word | tr "[A-Z]" "[a-z]")
                        encrypted=$(echo $word | tr "[a-z]" "-")
                        display $encrypted $word
                        break
                else
                        echo "Please enter a word consisting of only the letters a-z."
                        read word
                fi
        done

Whats highlighted in bold is the problem. Every time it reaches it, nothing is allowed ! Not even if the input is completely valid as in:

abcd

What i want it to do is accept ONLY a-z characters and nothing else - no spaces either. In theory it should work however in practice i really do believe the 'read' command is giving me the trouble. Maybe a chop-esque function is required such as the one in perl.

I hope you guys can help! Thank You. -shell is BASH

shadow0001

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LEARN ABOUT FREEBSD

service

SERVICE(8)						    BSD System Manager's Manual 						SERVICE(8)

NAME

     service -- control (start/stop/etc.) or list system services

SYNOPSIS

     service -e
     service -R
     service [-v] -l | -r
     service [-v] <rc.d script> start|stop|etc.

DESCRIPTION

     The service command is an easy interface to the rc.d system.  Its primary purpose is to start and stop services provided by the rc.d scripts.
     When used for this purpose it will set the same restricted environment that is in use at boot time (see below).  It can also be used to list
     the scripts using various criteria.

     The options are as follows:

     -e  List services that are enabled.  The list of scripts to check is compiled using rcorder(8) the same way that it is done in rc(8), then
	 that list of scripts is checked for an "rcvar" assignment.  If present the script is checked to see if it is enabled.

     -R  Restart all enabled local services.

     -l  List all files in /etc/rc.d and the local startup directories.  As described in rc.conf(5) this is usually /usr/local/etc/rc.d.  All
	 files will be listed whether they are an actual rc.d script or not.

     -r  Generate the rcorder(8) as in -e above, but list all of the files, not just what is enabled.

     -v  Be slightly more verbose

ENVIRONMENT

     When used to run rc.d scripts the service command sets HOME to / and PATH to /sbin:/bin:/usr/sbin:/usr/bin which is how they are set in
     /etc/rc at boot time.

EXIT STATUS

     The service utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     The following are examples of typical usage of the service command:

	   service named status
	   service -rv

     The following programmable completion entry can be use in bash(1) for the names of the rc.d scripts:
	   _service () {
		local cur
		cur=${COMP_WORDS[COMP_CWORD]}
		COMPREPLY=( $( compgen -W '$( service -l )' -- $cur ) )
		return 0
	   }
	   complete -F _service service

SEE ALSO

     bash(1) (ports/shells/bash), rc.conf(5), rc(8), rcorder(8)

HISTORY

     The service utility first appeared in FreeBSD 7.3.

AUTHORS

     This manual page was written by Douglas Barton <dougb@FreeBSD.org>.

BSD
								 December 11, 2012							       BSD