If you want to remove the first, let’s say, 27 characters from each line of output, you would:

$ some command|sed 's/^.\{27\}//'

bash · regular expressions · sed · shell

sfdisk /dev/sdb <(sfdisk -d /dev/sda|perl -pi -e 's/sda/sdb/g')

perl · sfdisk · shell

wodim cdimage.iso

Does life get much easier? Read up about wodim for an understanding of its origins in relation to the older `cdrecord` utility

cdrecord · cdrom · wodim

Convert vdi to vmdk (virtualbox hard disk conversion to vmware hard disk format)

VBoxManage internalcommands converttoraw winxp.vdi winxp.raw && qemu-img convert -O vmdk winxp.raw winxp.vmdk && rm winxp.raw

Converts a .vdi file to a .vmdk file for use in a vmware virtual machine. The benefit: using this method actually works. There are others out there that claim to give you a working .vmdk by simply using the qemu-img command alone. Doing that only results in pain for you because the .vmdk file will be created with no errors, but it won’t boot either.

Be advised that these conversions are very disk-intensive by nature; you are probably dealing with disk images several gigabytes in size.

Once finished, the process of using the new .vmdk file is left as an exercise to the reader.

qemu · vboxmanage · virtualbox · vmdk · vmware

perl -pi -e 's/$findstr/$replacestr/g' file1 [file2, file3...]

It does not get much better than that. You get the benefit of Perl’s superior regex engine (sed is nice but it just can’t compare), and oooooooo baby it’s fast! Perl was made to process text!

perl · regular expressions

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:set nocompatible
:filetype plugin indent on
:syntax enable
:set background=dark
:set tabstop=3
:set shiftwidth=3
:set softtabstop=3
:set ignorecase
:set expandtab
:set modeline
:set ruler
:set showmatch
:set nohlsearch
:nnoremap <f5> :set invpaste paste?<cr>
:set pastetoggle=<f5>
:let perl_fold=1
:set foldmethod=syntax
:set cursorline
:set number
:set backspace=eol,indent,start
:autocmd BufWritePre * :%s/\s\+$//e
:autocmd BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$") | exe "normal g'\"" | endif
 
" vim: set ft=vim :

- updated Fri Jan 15 05:26:47 CST 2010 (becuz it just keeps getting more and more awesome)

vim

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gpg --export-options export-local-sigs,export-attributes,export-sensitive-revkeys --export-secret-keys --armor > seckey.asc
gpg --export-options export-local-sigs,export-attributes,export-sensitive-revkeys --export --armor > pubkey.asc
gpg --export-ownertrust --armor > ownertrust.asc

gpg

/usr/bin/sudo -u www-data /usr/bin/tracd -p 80 -b $HOST -s -d --basic-auth='*',/usr/share/trac/.htpasswd,/usr/share/trac /usr/share/trac

…then set up rinetd to forward port 80 to port 8080 (you’ll have to install rinetd first; the configuration file for rinetd is very straightforward and doesn’t really need any explanation here)

apache · rinetd · trac

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SELECT column_name
FROM information_schema.`COLUMNS` COLUMNS
WHERE table_name = 'TABLE_NAME';

mysql · sql

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server {
	listen   80;
	server_name  YOURDOMAIN;
	access_log  /var/log/nginx/access.log;
 
	location / {
		fastcgi_pass  unix:/PATH/TO/YOUR/CATALYST_APP/fastcgi.socket;
		include fastcgi_params;
	}
 
	location /static {
		root  /PATH/TO/YOUR/CATALYST_APP/root;
	}
}
 
# LAST STEP: START YOUR CATALYST APP LIKE THIS FROM AN INIT SCRIPT OR IN A SCREEN SESSION:
# $ sudo -u www-data /PATH/TO/YOUR/CATALYST_APP/script/MYAPP_fastcgi.pl -n 10 -l fastcgi.socket -e 2>&1

catalyst · config · fastcgi · howto · nginx · perl