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I learned of a cool feature in the cd command, which to my knowledge works under zsh, bash, ksh and possibly other shells. cd - takes you to your previous directory, letting you easily switch back and forth between two directories. Take /home/ryan and /etc for example: ryan@lambda:~$ cd /etc ryan@lambda:/etc$ cd - /home/ryan ryan@lambda:~$ cd - /etc ryan@lambda:/etc$ Please share any other cool shell tricks you may know
Sun, 27 Sep 2009 20:00:00 -0500 In light recent new attacks against SHA-1 [1,2], and the NIST guidance My old key will continue to be valid for some time to come, but I'd The old key was: pub 1024D/E95EDDC9 2006-02-22 And the new key is: pub 10240R/4A11C97A 2009-09-23 [expires: 2019-09-21] To fetch my new key from a public key server, you can simply do: gpg --keyserver subkeys.pgp.net --recv-key 4A11C97A If you already know my old key, you can now verify that the new key is gpg --check-sigs 4A11C97A If you don't already know my old key, or you just want to be double gpg --fingerprint 4A11C97A If you are satisfied that you've got the right key, and the UIDs match gpg --sign-key 4A11C97A Lastly, if you could upload these signatures, I would appreciate it. gpg --keyserver subkeys.pgp.net --send-key 4A11C97A If you prefer, you may also email me your signatures in an encrypted Please let me know if there is any trouble, and sorry for the Thanks, [1] http://eurocrypt2009rump.cr.yp.to/837a0a8086fa6ca714249409ddfae43d.pdf iQUcBAEBCgAGBQJKv/yAAAoJEI97+PxKEcl63qwn/1pX953oy4Z0cD1RA1msY6D3 The Quassel irc client was shipped as default in Kubuntu 9.04 and has this lovely feature allowing you to monitor multiple windows simultaneously, see this screenshot for a better idea of what it does. However, I often want to access IRC from computers I don’t control and thus installing Quassel each and everytime I want to access IRC (it’s main feature is that it’s a distributed IRC client, multiple clients can connect to one core) is impractical. I thus resort to SSH (using one time passwords, who knows what’s sniffing my keystrokes), screen and irssi. However, irssi, out of the box, does not provide you with a ‘monitor’ window similar to Quassel’s. Here are the instructions on how to get one and what the finished product should look like.
Aug
21
2009
 
Fixing “mount.nfs: mount system call failed” on a Debian NFS serverPosted by: Ryan Kavanagh in Misc computersI’ve been trying to figure out why I was always getting ┌────────────────────┤ Configuring portmap ├─────────────────────┐ │ │ │ By default, portmap listens to all IP addresses. However, if │ │ this machine does not provide network RPC services (such as │ │ NIS or NFS) to remote clients, you can safely bind it to the │ │ loopback IP address (127.0.0.1). │ │ │ │ This will allow RPC local services (like FAM) to work │ │ properly, while preventing remote systems from accessing the │ │ RPC services. │ │ │ │ This configuration can be changed by editing the OPTIONS line │ │ in the /etc/default/portmap file and adapting the use of the │ │ -i option to your needs. │ │ │ │ Should portmap be bound to the loopback address? │ │ │ │ <Yes> <No> │ │ │ └────────────────────────────────────────────────────────────────┘ I hope this will help whoever else encounters the same issue.
Aug
19
2009
Quota prettifyer and getting quota information from WindowsPosted by: Ryan Kavanagh in Misc computersAt work I was asked to write a small script that allows users to get their quota from a Windows machine since apparently Windows doesn’t have an equivalent to the ‘ This is composed of three parts, the first is a BAT script that calls putty with the hostname and points to a file with a list of commands to run. The second is this said list of commands to run. The third (and best part) is a short Perl script that will take the output of ‘ You will have to substitute BAT fileREM - Quota.bat by Ryan Kavanagh <ryanakca@kubuntu.org> @ECHO OFF CLS CALL C:\Program~1\putty.exe -ssh HOSTNAME.DOMAINNAME.TLD -l %USERNAME% -t -m C:\Program~1\winquota\quota Now to the list of commands to run on the remote host, to be put in BASH script#!/bin/bash # By Ryan Kavanagh <ryanakca@kubuntu.org> perl /usr/local/bin/quotacheck.pl sh -c "echo -e 'This script will exit in:\t15 seconds\c'; sleep 1;" sh -c 'for i in {14..10}; do echo -e "\b\b\b\b\b\b\b\b\b\b"$i" seconds\c"; sleep 1; done' sh -c 'for i in {9..1}; do echo -e "\b\b\b\b\b\b\b\b\b\b "$i" seconds\c"; sleep 1; done' sh -c 'echo ""' This calls the Perl script. The rest of the script is to provide the user enough time (15 seconds) to read the output. If we didn’t have this, Putty would exit as soon as the display from quotacheck.pl had been displayed. Place the following Perl script in Perl script#!/usr/bin/perl # quotacheck.pl -- Prettyfies the quota command's output # Copyright (C) 2009 Ryan Kavanagh <ryanakca@kubuntu.org> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. use strict; use English; my @quota = `quota -v`; sub fmt_quota { my $line = shift; # Get rid of leading whitespace so that we can work with Linux's quota # command as well. $line =~ s/^\s+//; my @a = split /\s+/, $line; my %data; my $os = $OSNAME; my $unit; if ($os == 'solaris') { # Solaris' quota uses 1kb as the unit $unit = 1024; } elsif ($os == 'linux') { # Linux's quota uses 512kb blocks as the unit $unit = 512; } else { $unit = 1; print "Disk usage unit might be incorrect"; } if (($a[1] > $a[2]) && ($a[2] != 0)) { # The disk usage is over the quota, we'll receive a disk grace time %data = ( 'fs' => $a[0], 'd_usage' => sprintf("%.2f", $a[1] / $unit) . 'M', 'd_quota' => sprintf("%.2f", $a[2] / $unit) . 'M', 'd_limit' => sprintf("%.2f", $a[3] / $unit) . 'M', 'd_grace' => $a[4], 'f_usage' => $a[5], 'f_quota' => $a[6], 'f_limit' => $a[7], ); } else { # We won't receive a disk grace time. %data = ( 'fs' => $a[0], 'd_usage' => sprintf("%.2f", $a[1] / $unit) . 'M', 'd_quota' => sprintf("%.2f", $a[2] / $unit) . 'M', 'd_limit' => sprintf("%.2f", $a[3] / $unit) . 'M', 'f_usage' => $a[4], 'f_quota' => $a[5], 'f_limit' => $a[6], ); } if (($data{'f_usage'} > $data{'f_quota'}) && ($data{'f_quota'} != 0)) { # The file usage is over the file quota, we'll receive a file grace # time. if (exists($data{'d_grace'})) { # The disk grace time is set, therefore we want $a[8]. $data{'f_grace'} = $a[8]; } else { $data{'f_grace'} = $a[7]; } } my @lines; use integer; my $fs_pad = (80 - length ($data{'fs'})) / 2; no integer; # Push the header push(@lines, " " x $fs_pad . $data{'fs'} . " " x $fs_pad . "\n"); push(@lines, " " x 15 . sprintf("%-15s%-15s%-15s%s", "YOUR USAGE", "YOUR QUOTA", "YOUR LIMIT", "GRACE TIME") . "\n"); push(@lines, sprintf("%-15s%-15s%-15s%-15s%s", "DISK USAGE", $data{'d_usage'}, $data{'d_quota'}, $data{'d_limit'}, $data{'d_grace'}) . "\n"); push(@lines, sprintf("%-15s%-15s%-15s%-15s%s", "FILE COUNT", $data{'f_usage'}, $data{'f_quota'}, $data{'f_limit'}, $data{'f_grace'}) . "\n"); return @lines; } # Run fmt_quota on quota's output. Nothing interesting before line 2. print $quota[0]; for (my $line = 2; $line != @quota; $line++) { print fmt_quota($quota[$line]); } I, the copyright holder of this work, hereby release the BAT file and the BASH script into the public domain. This applies worldwide. In case this is not legally possible, I grant any entity the right to use the BAT file and the BASH script work for any purpose, without any conditions, unless such conditions are required by law. The Perl script (quotacheck.pl) is released under the terms of the GNU General Public License version 2, or (at your option) any later version. One of the hardest parts of starting a new project is finding a catchy, easy to pronounce and easy to spell name. I’m writing a set of utilities for managing GPG on a LUKS partition that will do the following:
I’ve been using a prototype I hacked together for the past few months… I would imagine it useful for those who have multiple laptops and desktops, all under their own control, but who don’t want to have copies of their private key spread out all over the place… therefore they just plug USB key in computer A, and when they need to go work on computer B, they just take their key with them… I would also imagine it useful for those among us who are paranoid and want to backup their key to an encrypted USB stick, etc. Anyways, the most creative names I’ve come up with are:
Any ideas? The Kubuntu wiki has a flashy new theme! It isn’t yet default, but if you’d like to help test it out, head on over to your wiki preferences page and select the kubuntunew theme from the dropdown box. If you encounter any bugs, please report them here. Thanks to Matthew “mdke” East for providing the base for our theme and to the Canonical Sysadmins for installing it. Sorry, two posts in a row, but here’s my quote. A bit more than a sentence, but oh well.
Mark Z. Danielewski’s House of Leaves Meme HOWTO:
Nov
11
2008
Installing a vanilla Firefox in Kubuntu IntrepidPosted by: Ryan Kavanagh in Planet UbuntuAs webmaster, one should test their work in as many browsers as they can. As Kubuntu doesn’t have Firefox installed by default, I decided I probably should install it (Konqueror rocks by the way… Notice, there’s a pile of GNOME cruft, namely synaptic, gksu, that we Kubuntu users don’t necessarily need nor want. Since aptitude does not have super cow powers, we can do the following: Lets take a closer look at what is going on here. We are installing firefox-3.0, but we are asking aptitude not to install ubufox nor gksu and to keep it that way on any future upgrades. To learn more about aptitude’s install options, look at aptitude’s manpage, from line 38 onwards. This command reduced what we had to install to Much better, don’t you think? Two packages to install instead of 40, 1086kB vs 20.9MB to download and 3854kB vs 87.8MB unpacked. Enjoy, Hi Planet, If you’ve customized the default desktop, please try to keep it minimal and include instructions on how you achieved these customizations so that new users don’t get frustrated trying to achieve them. Thanks! |
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