from small one page howto to huge articles all in one place
 

search text in:





Poll
Which kernel version do you use?





poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

91166

userrating:

average rating: 1.7 (82 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

207013

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

88561

userrating:

average rating: 1.3 (28 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion . pdf icon
You are here: System->Tips and Tricks

Introducing the -- flag

This tip introduces the -- flag. This flag is supported by many utilities but isn't always documented in the man pages. However, it can be very useful, especially when dealing with malformed filenames.

Note: Most programs that make use of --option also support the -- flag since it is a standard feature of GNU getopt().

The -- flag forces everything passed in after it to be an argument to the command. This can be extremely useful when dealing with filenames that start with a - which would normally indicate an option or flag passed to the command.

For example, assume that for some reason, there is a file named -file that needs to be deleted. Normally you would use the command rm to delete a file, but this doesn't work since the file in question starts with a -. But by using the -- flag, we force rm to recognize -file as an argument and not an option.

Code Listing 1: Using the -- flag

// Attempting to use rm results in an error as rm tries to 
// process all of the letters as options (f,i,l,e). It fails 
// on 'l' since that isn't a valid option for rm. 
% ls 
-file 
 
% rm -file 
rm: invalid option -- l 
Try `rm --help' for more information 
 
% rm -- -file 
% ls 
  
// -file was successfully removed

Note: For more technical information, see man 3 getopt.

From http://www.gentoo.org/news/en/gwn/20031013-newsletter.xml


rate this article:
current rating: average rating: 1.0 (3 votes) (1=very good 6=terrible)
Your rating:
Very good (1) Good (2) ok (3) average (4) bad (5) terrible (6)

back
Support this site

Please read "Why adblockers are bad".



Other free services
toURL.org
Shorten long
URLs to short
links like
http://tourl.org/2
tourl.org
.
Reverse DNS lookup
Find out which hostname(s)
resolve to a
given IP or other hostnames for the server
www.reversednslookup.org
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2013 Sascha Nitsch Unternehmensberatung UG(haftungsbeschränkt)
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 4.3 ms