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.

Ọzọkwa, 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. 😉

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. 🙂

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
==> Finished making: kernel26 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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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 (ọma, 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.

#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
  echo "pem2pfx - converts a .pem formatted private-key and certificate file to an IIS-compatible .pfx file."
  echo "Usage: pem2pfx inputfile.pem"


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 anya maka nkwanye media – kpọmkwem achọ ọ bụla buru ibu ọdịnaya a na-ebudatara. Mgbe ị pịa akara ngosi, ọ na-egosi gị ihe ugbu a na-na nbudata iyi na-enye gị nhọrọ ndị kwụ n'ahịrị na ya dị ka a “nkịtị” download.

Ebe ọ bụ na ị dịghị mgbe mara ma ọ bụrụ FF na-aga ugboelu ma ọ bụ ike na-aga bee, Ka amasị m na-azọpụta a oyiri m na desktọọpụ na m nwere ike mgbe ahụ na-ele video na-enweghị na-eji ọzọ bandwit ibudata video ọzọ. Ọzọkwa, nọ ọrụ, mgbe ndị mmadụ hapụ m ka m njikọ youtube ma ọ bụ ndị ọzọ na media, M na-emekarị emekpala ekiri ruo ọtụtụ mgbe – na m na-atụrụ ndụ ma ọ bụ n'oge nkwụsịtụ.

Mmebi Canary – 9

A mma n'anya na di ntakiri Adon na Imea na-agwa gị ma ọ bụrụ na SSL akwụkwọ maka saịtị na ị na-ugbu a na-ele na-adịghị anya aga-ekubi ume. Ọ bụrụ na gị onwe gị na saịtị a nwere ihe SSL akwụkwọ, M nwere ike ikwu na ị na-eji nke a Adon na Imea Iji nyere gị na saịtị ahụ si SSL akwụkwọ ekubie ume ruru ka a dị mfe enweghị ngosi ma ọ bụ 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

N'ihi na web mmepe na experimentation na peeji nke. Awesome maka anwale obere ibe n'ibe nke koodu nakwa dị ka debugging peeji nke.

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

Awesome n'ihi eme nchọgharị kpọmkwem peeji site kpọmkwem zighachi akwụkwọ nnọchiteanya sava. This is useful for when some sites are blocked or the SAIX Transparent Proxy servers aren’t working properly. 🙂

M jiri nke a iji ụzọ ụfọdụ okporo ụzọ n'elu zighachi akwụkwọ nnọchiteanya sava na m ga kama na-aga site na ndabara ụzọ gasị. Its also very flexible. Ọ bụrụ na ị nwere ihe karịrị otu zighachi akwụkwọ nnọchiteanya nkesa dị ka onye ị na-emekarị na-eji na mberede na-aga na ntabi, dị nnọọ ịgbanwee n'elu ka etienede. 🙂

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 bụ egwu na igbochi Mgbasaozi. Ya a obere iwe na mbụ ebe ọ bụ na ị ga-whitelist niile saịtị na-amasị gị – but in the long run it is soooo worth it. 🙂

-akpọlite ​​Pages – 10

Nnọọ uru n'ihi na ọ bụrụ na ị na-agagharị na-a na saịtị ma ọ dịịrị ala. Ọ bụrụ na saịtị bụ static-content na-edebere ndị ahụ a na-eme ka ọ dị mfe ngwa ngwa ahụ na ọdịnaya ma ọ bụrụ na ya cached online.

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.