May 2011
1 post
digging for library problems?
ldd `which [progname]`
The output will be a list of the shared libraries on the system that the program needs to run, as well as the missing libraries.
September 2009
2 posts
More dabbling around audio configuration
I have found the tools that come with the desktop environments to be fickle - so here are some pointers to figure things out from the command line
Step 0 - lspci (make sure it is even seen at a low level)
lspci -v
if not in there, you have a hardware or bios problem
Step 1 - aplay
aplay -l
(it’s a lower case L)
**** List of PLAYBACK Hardware Devices **** card 0: VT82xx [HDA VIA VT82xx],...
Memory jog: Crypto tools →
############################# # GNUPG #############################
# generate a keypair
gpg --gen-key
# export ones public key
gpg --armor --output pubkey.txt --export 'My name'
# send the key on the server (easier with kgpg)
gpg --send-keys 'My name' --keyserver hkp://subkeys.pgp.net
# import someone else's key
gpg --import key.asc gpg --search-keys 'tnagy1024@gmail.com' --keyserver...
August 2009
14 posts
Nice trick: number base conversion one liners... →
For those who needs quick help on number conversion between base-x to base-y, bc can lend a help here.
For example, what’s the hexadecimal form of 116?:
$ echo ‘obase=16; 116’ | bc
74
And what does binary 11010101 look in decimal?
$ echo ‘ibase=2; 11010101’ | bc
213
By doing below step, you directly convert binary 11010101 to hexadecimal:
$ echo...
Memory Jog: bash control characters and special...
| = pipe will take the first commands stdout as the second commands stdin. || = OR if first command is false, it will take the second. |= = OR IS (mostly used in if statements) && = AND if first command is true, it will execute the second one. ! = NOT (mostly used in if and test statements) != = NOT IS (mostly used in if statements) !$ = last commands last argument = = IS (mostly used...
RSI prevention: pgrep
look up (pgrep) or signal (pkill) processes based on name and other attributes
pgrep [-flvx] [-d delimiter] [-n|-o] [-P ppid,…] [-g pgrp,…] [-s sid,…] [-u euid,…] [-U uid,…] [-G gid,…] [-t term,…] [pattern] pkill [-signal] [-fvx] [-n|-o] [-P ppid,…] [-g pgrp,…] [-s sid,…] [-u euid,…] [-U uid,…] [-G gid,…] [-t...
1 line download source for slackbuild
Slackbuilds are a lot like freeBSD ports (or slitaz receipts) - except they don’t download the source for you. So you do a lot of repetitive: download build, untar, change into directory, download source, run script, copy resulting package. Just did 20 of them and thoroughly annoyed, and if i want all the perl and python builds there’s dozens more!
1. the resulting package location...
memory jog: Vim
Copy & Select Text aka Yank
v Visual - move to select the text you wish to handle. +y Copy the selected text. d Cut the selected text. ggVG Select all
*NOTE: “+” represents shift. Paste aka Put:
p Pastes the selection
Delete aka Cut: *NOTE: in vim “delete” and “cut” is the same.
dw To delete from the cursor to the...
memory jog: command line wireless tools
basic configuration
iwconfig wlan0 iwconfig wlan0 essid "mynetwork" iwconfig wlan0 key XXXXXXXXXXXXXXXXXXXXXXXXXXX
ifconfig has options like: roaming, bssid, nwkey, wpa but they to set the card as an access point iirc
wpasupplicant for complex key operations
diagnostics
lsmod ifconfig -a iw wlan0 scan iwlist wlan0 scanning ifconfig wlan0 up scan
config files
on slackware: same as wired in...
ways to set the keyboard (in my case to swiss...
console:
/usr/bin/loadkeys /usr/share/kbd/keymaps/i386/qwertz/fr_CH-latin1.map.gz
for x:
setxkbmap ch -variant fr
“df -P /usr | grep /usr | awk ‘{ print $5}’ | sed...”
– extract disk space from the df command
What is the equivalent of the Linux 'lsmod'...
Remember to actually describe what you want, rather than just giving the linux command. To list the loaded kernel modules, run kldstat
freebsd mailing list
“#######################
# snapshot information
# super primitive way to keep a...”
– from my my old crib sheet
Bash customized
just capturing a whole bunch of notes around making the bash shell more practical, esp. when I end up in distributions which give it to you raw…
Files
/etc/profile (global)
/etc/bashrc (global)
~/.bash_profile
~/.bashrc
~/.bash_logout
Prompts
setup prompt to display date/time, hostname and current directory: $ PS1="[\d \t \u@\h:\w ] $ "
eg of clever script for bashrc
# If id...
“upgrade your stable Slackware system to Slackware “current”:
1. Set...”
– from DistroWatch.com
note: step 5 really should read “run 2,3,4 again now that you have the latest package tools”
Job and Process Control
any_command &
Run any command in the background
ps -xaf (or xafu or xef depending on OS and distro)
Pretty complete and hierarchical list of currently running processes with their process ID (PID) numbers.
<Ctrl>z
Send the current process to the background.
jobs
List my background or stopped processes and show their job numbers.
fg job_number
Bring a...
Sound Lines - notes on setting sound via ALSA
a few simple steps to set up sound:
alsaconf /etc/rc.d/rc.alsa start alsamixer alsactl store
If alsaconf asks for permission to modify modprobe conf, grant it.