need help on that script!! Post: 302180254

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Top Forums Shell Programming and Scripting need help on that script!! Post 302180254 by era on Sunday 30th of March 2008 02:43:06 PM

03-30-2008

Registered User

You need to make sure the grep looks at the first field in the passwd file, but that's easy enough to fix.

Code:

who=`grep "^$1:" /etc/passwd | cut -d : -f6 | grep .`
case $? in 0) dance and sing, user is "$who";;
  *) echo "$0: user '$1' not found" >&2
      exit 1;;
esac

In the backticks, I tacked on a "grep ." to see if the cut generated any output. If there is any output, grep will return success, and $? will be 0. (See the sh manual page for a bit more on this.)

The choice of case over if/then/else is kind of old-school; if you are more familiar with the if syntax, perhaps you prefer that -- I think it's uglier.

(This is for the terminally curious readers. Skip it if you don't understand it.

Back in the old days, it mattered more, because if would invoke an external process, whereas case does not. These days, test and friends are built into the shell anyway, so they don't create an external process.)

P.S. Try to think of a proper topic when you post. Most people who post here need help with a script; try to be informative and succinct.

era

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installsieve

INSTALLSIEVE(1) 					      General Commands Manual						   INSTALLSIEVE(1)

 *

NAME

       installsieve - user utility for managing sieve scripts

SYNOPSIS

       installsieve

DESCRIPTION

       installsieve is a utility that allows users to manage their sieve scripts kept on the server.

OPTIONS

       -v <name> View script with the given name. The script if retrieved sucessfully is output to standard output.

       -l  List  all  of  the scripts currently on the server. If one of the scripts is active a arrow is printed indicating that it is the active
       script.

       -p <port> Port to connect to. If left off this defaults to "sieve" as defined in /etc/services.

       -i <file> Install a file onto the server. If a script with the same name already exists on the server it is overwritten.  Upon  sucessfully
       putting	the  script on the server the script is set active. If <file> has the extension .script it is chopped when put on the server since
       sieve names may not contain a '.'.

       -a <name> Set <name> as the active script. The list of available names can be obtained from the '-l' option..

       -d <name> Delete the sieve script on the server with <name>.

       -m <mechanism> Force installsieve to use <mechanism> for authentication. If not specified the strongest authentication mechanism is chosen.

       -g <name> Get the sieve script with <name> and save it to disk with a ".script" extension. If a file with that name already  exists  it	is
       overwritten.

       -u <user> Userid/Authname to use for authentication; by default, the current user.

CMU
								   Project Cyrus						   INSTALLSIEVE(1)