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.

juga, 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. 😉

Kongsi
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. 🙂

Kongsi
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. 😛

Kongsi
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 (baik, 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

lebih…

Kongsi
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. Walau bagaimanapun, 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… :-/

Muat turun Bar Status – 10

Saya lebih suka mempunyai segala-galanya dalam Firefox dalam tetingkap tunggal dalam tab. Mempunyai kotak muat turun dalam tetingkap berasingan adalah besar tidak-tidak untuk saya. It also saves screen real-estate since it is very minimal. 🙂

video DownloadHelper – 10

Video DownloadHelper kelihatan untuk penstriman media – khusus mencari sebarang kandungan besar yang sedang dimuat turun. Apabila anda klik pada ikon, ia menunjukkan anda aliran kini-turun dan memberikan anda pilihan untuk beratur sebagai “normal” muat turun.

Oleh kerana anda tidak pernah tahu jika FF akan crash atau kuasa akan memotong, Saya lebih suka untuk menyimpan satu salinan ke desktop saya dan saya kemudiannya boleh melihat video tanpa menggunakan untuk memuat turun video sekali lagi lebih banyak bandwidth. juga, di tempat kerja, apabila orang menghantar saya link ke youtube atau media lain, Saya biasanya tidak mengganggu menonton sehingga banyak selepas – pada masa lapang saya sendiri atau semasa rehat.

Expiry Canary – 9

This neat and minimal addon tells you if the SSL certificate for the site you’re currently viewing is soon going to expire. If your own site has an SSL certificate, Saya cadangkan anda menggunakan addon ini untuk membantu mengelakkan sijil SSL laman web anda yang akan tamat tempoh kerana kekurangan yang mudah untuk pemberitahuan atau salah faham.

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

Untuk pembangunan web dan percubaan dengan laman. Awesome untuk menguji bit sedikit kod serta debugging laman.

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 untuk melayari halaman tertentu melalui pelayan proksi tertentu. This is useful for when some sites are blocked or the SAIX Transparent Proxy servers aren’t working properly. 🙂

Saya menggunakan ini untuk laluan lalu lintas lebih pelayan proksi yang saya tidak mahu pergi melalui laluan lalai. Its also very flexible. Jika anda mempunyai lebih daripada satu pelayan proksi yang ada dan apa yang anda biasanya menggunakan tiba-tiba menyala berkelip, hanya beralih ke satu depan. 🙂

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 adalah AWESOME pada iklan menyekat. menjengkelkan sedikit Its pada mulanya kerana anda perlu senarai putih semua laman yang anda suka – but in the long run it is soooo worth it. 🙂

membangkitkan Laman – 10

Sangat berguna untuk jika anda menyemak imbas ke laman web dan ia berlaku akan turun. Jika laman web ini adalah statik kandungan berorientasikan maka ini menjadikannya mudah untuk mencari dengan cepat kandungan jika mereka cache talian.

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.

Kongsi