July 2005
Intermediate to advanced
944 pages
158h 24m
English
book
Linux in a Nutshell, Fifth Edition
by Ellen Siever, Aaron Weber, Stephen Figgins, Robert Love, Arnold Robbins
Content preview from Linux in a Nutshell, Fifth Edition
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whence | 695
Bash and Korn
This is the Title of the Book, eMatter Edition
Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.
unalias
unalias names
unalias -a
Remove names from the alias list. See also alias.
Option
-a Remove all aliases. Not ksh88.
unset
unset [options] names
Erase definitions of functions or variables listed in names.
Options
-f Unset functions names.
-n Unset indirect variable (nameref) name, not the variable the
nameref refers to. ksh93 only.
-v Unset variables names (default). Not ksh88.
until
until condition
do
commands
done
Until condition is met, do commands. condition is often specified
with the test command. See the Examples under case and test.
wait
wait [ID]
Pause in execution until all background jobs complete (exit status 0
is returned), or pause until the specified background process ID or
job ID completes (exit status of ID is returned). Note that the shell
variable $! contains the process ID of the most recent background
process.
Example
wait $! Wait for most recent background process to finish
whence
whence [options] commands
Korn shell only. Show whether each command name is a Unix
command, a built-in command, a defined shell function, or an
alias.
Options
-a Print all interpretations of commands. ksh93 only.
-f Skip the search for shell functions. ksh93 only.
-p Search for the pathname of commands.
-v Verbose output.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.