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.

koa, 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

I prefer having everything in Firefox in a single window in tabs. Having a download box in a separate window is a big no-no for me. It also saves screen real-estate since it is very minimal. 🙂

Video DownloadHelper – 10

Video DownloadHelper mitady mivantana haino aman-jery – manokana misy mitady afa-po lehibe izay ho alaina. Rehefa tsindrio eo amin'ny matoanteny, izany dia mampiseho anao ny amin'izao fotoana izao-misintona renirano sy manome anao ny safidy mba milahatra azy io ho toy ny “ara-dalàna” Download.

Koa satria tsy fantatrao ianao raha FF no handeha hianjera na ny fahefana dia handeha manapaka, Kokoa aho mba hamonjy ny dika mitovy ny ny biraonao, ary afaka mijery ny lahatsary avy eo nefa tsy mampiasa bebe kokoa passante mba télécharger ny lahatsary indray. koa, any am-piasana, rehefa handefa ahy rohy amin'ny YouTube na haino aman-jery hafa, Matetika aho no tsy manahirana mijery mandra-be rehefa – eo amin'ny ny fialam-boly, na nandritra ny fiatoana.

expiry Canary – 9

Zavatra tsy madio sy ny zara Adaona milaza anareo, raha ny SSL taratasy ho amin'ny toerana amin'izao fotoana izao ianao dia mijery ela dia handeha hiala aina. Raha ny toerana manana taratasy fanamarinana SSL, Manoro hevitra anareo aho hampiasa Adaona ity mba hanampy ny vohikala tsy ny SSL expiring taratasy tsotra noho ny tsy fahampian'ny fampahafantarana na 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

Fa tranonkala fampandrosoana sy ny fanandramana amin'ny pejy. Mahatahotra ho an'ny mizaha toetra potika kely ny fehezan-dalàna ary koa ny debugging pejy.

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

Mahatahotra ho variana pejy manokana amin'ny alalan'ny taratasy fanomezam-pahefana manokana lohamilina. This is useful for when some sites are blocked or the SAIX Transparent Proxy servers aren’t working properly. 🙂

I mampiasa izany ny lalana sasany fifamoivoizana ny taratasy fanomezam-pahefana lohamilina izay aho fa tsy handeha amin'ny alalan'ny toerana misy anao lalana. Its also very flexible. Raha manana mihoatra ny iray misy mpizara taratasy fanomezam-pahefana sy ny olona mampiasa matetika tampoka ianao mandeha amin'ny 'ny indray mipi, mifamadika fotsiny eo ny manaraka. 🙂

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 mahatahotra amin'ny fanakanana dokam-barotra. Ny mahasosotra kely tamin'ny voalohany, satria tsy maintsy whitelist rehetra ny toerana tianao – but in the long run it is soooo worth it. 🙂

hanangana Pages – 10

Tena mahasoa Fa raha mijery ny toerana dia tonga izany mba ho any. Raha toa ka ny toerana dia voasakantsakan'ny-afa-po-mirona dia izany no mahatonga azy mora ny haingana mahita ny afa-po raha ny Voatakona-tserasera.

Tab 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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