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Full Discussion: Bash shell - Check if value is valid directory.
Homework and Emergencies Homework & Coursework Questions Bash shell - Check if value is valid directory. Post 302573482 by Corona688 on Monday 14th of November 2011 05:11:20 PM
Old 11-14-2011
You're almost there.

Code:
elif [ "$DIR" != -d ]

This checks if the string "$DIR" is the same as the string "-d", which of course it isn't.

You had it right in the last statement, with [ ! -d "$DIR" ]. That causes an error if "$DIR" isn't a dir or it doesn't exist.

So you really have it covered with the first two. Just chop out all of this:
Code:
elif [ "$DIR" != -d ]
then
        echo "Not a Directory"
        exit 5

and you'll be okay.

---------- Post updated at 04:11 PM ---------- Previous update was at 04:10 PM ----------

Oh, and if they insist you check if it exists or not seperately, check with [ ! -e "$DIR" ] before you check with -d.
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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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