Tag-Archive for » bash «

Thursday, November 12th, 2009 | Author:

If you ever find yourself updating a single application in Arch Linux (a very bad idea, btw) and it upgrades readline you might end up seeing an error along the lines of:
/bin/bash: error while loading shared libraries: libreadline.so.5: cannot open shared object file: No such file or directory
Hopefully you still have a bash prompt open and you haven’t closed them all. If you still can, immediately run the following:
pacman -S bash
else you won’t be able to run bash any more because bash would still be linking to the old version of readline.

Also, in future, don’t run
pacman -Sy application
(python in my case)
instead, run:
pacman -Syu
which will ensure that all applications are upgraded.

Personally, I think that bash should have had a dependency set saying that it required the old specific version of readline and the same for the new bash, requiring the new version of readline. Regardless, rather play it safe. 😉

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Friday, June 05th, 2009 | Author:

Well it turns out that the problem is a little more subtle than that. It is only the root user that does not have syntax highlighting.

You see, vim does have syntax highlighting but vi and vim are different binaries. A shell startup script only aliases vi to vim if the user id is higher than 100 – which excludes root. The simplest workaround is to just add an explicit alias to root’s .bashrc at /root/.bashrc :

alias vi='vim'

run the command manually or just log in again toactivatethe alias.

Btw, I’m starting to like via lot. For a long time it made no sense to mebut now I am found. 🙂

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Saturday, March 28th, 2009 | Author:

Its amazing how much you can do by combining the small yet powerful commands Unix has available.

This little-used command, time, finally became useful today as a way to report the length of time that certain automated operations are running. In my example, I’m timing how long it takes to build the Linux kernel:

$ time rebuild-kernel26
...
couple-thousand-lines-of-scrolling-text
...
==> Finished making: kernel26 2.6.28.8-1 x86_64 (Sat Mar 28 17:19:52 SAST 2009)
real    62m21.994s
user    43m31.846s
sys     6m1.096s

Yup, that took a little over an hour to build. The values are:

  • realthe actual time elapsed while the command was running – 62 minutes
  • userthe amount of userland time the command used – 43 minutes
  • systhe amount of system time the command used – 6 minutes

(I was busy doing other things while this was happening which is why it took 62 minutes for the desktop to do (43+6=) 49 minutes-worth of work)

If you’re using the GNU version (most likely), it also gives you the option of displaying the results in a custom fashion. Mostly, this command could be useful in scripts where you need to report how long a task tookor maybe? just a geeky way to time something random. 😛

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Category: linux  | Tags: , , , , , , ,  | Leave a Comment
Wednesday, March 18th, 2009 | Author:

[edit] So much for that. It turns out that openssl is able to determine that the key and certificate are already in a single file. Therefore, no csplitting required (well, I hope somebody reading this at least learned about how nice csplit is). In fact, the whole script might as well be obsoleteblaargh. Well, at least it gives a nice warning about not giving a blank passphrase. 😀

Here’s the new version:

pem2pfxconverts a .pem-formatted file containing a private key and signed certificate into a Windows-compatible .pfx certificate file.

#!/bin/bash
#pem2pfx
#v0.2
#Tricky - brendan@swiftspirit.co.za
# Converts a .pem certificate file to .pfx format
# $1 is the source file
set -e
 
if [ $# = 1 ]; then
  outputfile=`echo $1 | sed 's/.pem$/.pfx/'`
 
  echo "Please specify a password below. Windows refuses to import a .pfx certificate with a blank password."
  openssl pkcs12 -export -out $outputfile -in $1
 
 else
  echo "pem2pfx - converts a .pem formatted private-key and certificate file to an IIS-compatible .pfx file."
  echo "Usage: pem2pfx inputfile.pem"
fi

more

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Saturday, February 21st, 2009 | Author:

and my Personal Rating (PR) out of 10 😉

I use Firefox so most of these won’t apply to non-FF users. However, I’d be very very interested to hear what other addons my friends, subscribers, and random websurfers find interesting or useful to them. Have your say and let us know why you love the addons you love. 🙂

Personally, I prefer addons that aren’t intrusive. Ideally, an addon must have a minimal interface and give me a measurable benefit for me to keep it installed.

Cacheviewer – 7

This is a GUI front-end for the Cache Firefox keeps of the last few pages and media. I’ve found this addon more interesting than useful right now so I’m probably going to remove it soon.

ColorfulTabs – 9

I love the colours. The tab colour-grouping doesn’t work very well when you reach about 30 tabs though… :-/

Download Statusbar – 10

Ke khetha ho lintho tsohle tse Firefox fensetereng e le 'ngoe ka tab. Ho ba le jarolla lebokoso le le mo fensetereng arohaneng ke e kholo ho se ho se na-le 'na. It also saves screen real-estate since it is very minimal. 🙂

Video DownloadHelper – 10

Video DownloadHelper sheba phallela mecha ea phatlalatso ea – ka ho toba batla dikahare dife kapa dife tse kholo le ntseng le downloaded. Ha o tobetsa aekhoneng e, e bontša o melapo hajoale o-Downloading le u fa le kgetho ya ho lethathameng le hlophisitsweng e le “ho tloaelehile” jarolla.

Kaha u tsebe haeba FF o tlil'o etella kapa matla a tlang ho khaola, Nka rata ho pholosa kopi ho komporong ea ka 'me ke ka ka nako eo nka video sa sebelise kgonothebolo eketsehileng ho thowuni video hape. Also, mosebetsing, ha batho ba nthomelle amahanya ho mang youtube kapa lisebelisoa tse ling tsa, Ke atisa u se ke ua itšoenye ho shebella ho fihlela ho hongata ka mor'a – nakong ea phomolo ea ka e kapa nakong ea khefu e.

nako Canary – 9

Sena se addon behoe ka makhethe 'me fokolang e re u haeba setifikeiti SSL bakeng site u hajoale o sheba e haufinyane ho ea shoa. Haeba hao sebaka hae e na le lengolo la bopaki la SSL, Ke ho kgothaletsa u ka sebelisa addon ena ho thusa qoba hao sebaka a SSL setifikeiti sa e hlokahala ka lebaka la ho ho hloka bonolo tsebiso kapa miscommunication.

Fasterfox – 8

Fasterfox adds some network optmisation options. Some of the options could make your corporate network admin a little mad with you though. 😉

Firebug – 9

Bakeng sa ntshetsopele ho web le theknoloji le maqephe. E ntle bakeng sa inonye likotoana llisoa ke lintho tseo khoutu hammoho le debugging maqephe.

FoxClocks – 6

errtells you the time in other time zones. o.O Was useful for a short timenow its redundant since my head is working it out faster than I can glance. rm -f

FoxyProxy – 9

E ntle bakeng sa browsing maqephe tse tobileng tseo ho pholletsa server tse tobileng tseo ho vouta. This is useful for when some sites are blocked or the SAIX Transparent Proxy servers aren’t working properly. 🙂

Ke sebelisa sena ho tsamaea ka tsela efe ba bang ba sephethephethe tse fetang server vouta hore Nka mpa ua tsamaea ho pholletsa le litseleng ya kamehla. Its also very flexible. Haeba u na le tse fetang e le 'ngoe proxy fumaneha' me ea o tlwaetseng sebelisa tšohanyetso o tsoela pele panya ea, feela switjha holim 'ho ea latelang. 🙂

Greasemonkey – 10

Right now, I use this only for the GooglemonkeyR script. This script reformats Google‘s search results to your specifications and also has an option to show small thumbnail of the pages Google links to. Greasemonkey can do a lot more and there are plenty of scripts readily available for many many sites.

Live HTTP headers – 8

I’ve used this a few times to diagnose gzip compression issues with IIS web servers. Not much else to say though: It works.

Live PageRank – 10 (so faronly installed it yesterday)

This addon seems simple enough. It gets the PageRank from Google and shows it in the tray.

NoScript – 10

NoScript ke a hlollang nakong thibela dipapatso. Ea eona e tena bue hakaalo qalong ha u lokela ho whitelist liwebsaete tsohle u ka rata – but in the long run it is soooo worth it. 🙂

tsosa Pages – 10

se nang le thuso haholo bakeng sa haeba u sheba setšeng le e se etsahala hore e be fatše. Haeba site ke ee sa fetoleng boemo-dikahare tse sekametseng ka nako eo sena se etsa hore ho le bonolo ho ka potlako fumana dikahare ha yona Cached Inthaneteng.

Tab ya Mix Plus – 8

Awesome for if you have more than 7-or-so tabs.

ShowIP (using a version modified for work purposesdisplays company server’s canonical name when browsing) – 10

I cannot imagine the hell I’d have to go through to identify a server without this plugin. Okay, I can. Used to have to do this all the time. I eventually scripted it but I can’t find the original script. Here’s my 60-second attempt at recreating what was in that script:

$ cat /etc/hosts | grep `dig A $hostname @mycachingnameserver | grep . | grep -v "^;"`
$ dig -x `dig A $hostname @mycachingnameserver | grep ^$hostname | grep A | \
  awk '/[.]/{print $5}'` @mycachingnameserver | grep . | grep -v "^;"

Web Developer – 9

I used this once to diagnose some issues with a page. I don’t do much web development so I’m going to remove this one. Its no comment on its capabilities since I believe this is a top notch add-on if you’re doing a lot of web development work.

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