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Welcome to the PaskvilWiki!

The future shape of this wiki is unknown for now, let's hope it'll be something good...

This is partially a private wiki - viewing is allowed to all, but editing is allowed only to registered users.

This is more of a prevention than denial - I don't have time to monitor and moderate edits; - you're more than welcome to request registration, all contributors are very much welcome!

Just write me at josef.at.paskvil.dot.com.

References and Tutorials

Emacs and Slime Reference

Small jQuery Reference

Small jQuery Cheat Sheet

Small SPARQL, RDQL, etc. Cheat Sheet

Short Notes - Tips and Tricks

4store

setup and installation
running 4store
data import
data import and querying from Python
Turtle file printer (in Python)

Apache

Note on serving of local files
Self-Signed SSL Certificate
Enable SSL/HTTPS in Apache
.htaccess and mod_rewrite Tricks

Bash

Extensions and File Name
File Test Operators
Commands and Shortcuts

$ sudo !!                         - run last command as root
$ !!:gs/foo/bar                   - run last command, replacing 'foo' with 'bar'
$ ^foo^bar                        - run last command, replacing 'foo' with 'bar'
$ cp filename{,.bak}              - create a .bak copy of file
<Ctrl-x> <Ctrl-e>                 - open $EDITOR to edit current command line; upon exit, content will be run
$ <space>command                  - run the command without saving it in history
$ > file.txt                      - empty a file
<Alt+.>                           - put last argument on cursor place; repeat to cycle through
$ (cd /tmp && ls)                 - jump to /tmp, execute ls, and jump back here
$ pushd /tmp .... $ popd          - goes to /tmp, remembering current location; at later time, popd will bring you back
$ \command                        - run command without using aliases
$ rm !(pattern|pattern)           - delete files that do not match given patterns
$ find . -mtime +5 -exec rm {} \; - delete all files in this folder that are older than 5 days
<Ctrl-u> ... <Ctrl-y>             - Ctrl+u will cut current command, then you can do whatever you need, and Ctrl+y will paste it back
$ date -d @1234567890             - convert unix timestamp to human-readable

Informations

$ mount | column -t               - pretty-print mount table
$ cat /etc/issue                  - display distro name

Small Tricks

$ mount -t tmpfs tmpfs /mnt -o size=1024m      - mount temporary RAM partition (fast access, non-persistent!)
$ disown -a && exit               - exit the shell while keeping all running processes alive
$ ssh -t remote_host screen -r    - directly connect to a remote screen process
$ for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > "$I.sql.gz"; done
                                  - backup all databases into individual files
$ fuser -k filename               - kill process that is locking given file
$ readom dev=/dev/scd0 f=/path/to/image.iso    - create CD/DVD ISO image
$ mkdir -p a/deep/dir/tree        - create nested directories fast
$ mount file.iso /mnt/iso -o loop - mount ISO file as drive /mnt/iso (dir has to preexist)
$ sudo touch /forcefsck           - force a file system check on the next reboot

lsof

$ lsof -nPi                       - list network connections
$ netstat -tlnp                   - print all listening ports with PID's (run as root to see all process names)
$ lsof -c gnome-terminal          - list files opened by given command
$ lsof +D [folder]                - discover all open files in the [folder]
$ lsof -p [pid]                   - list files opened by given PID
$ lsof -i :8080                   - list programs that have port 8080 open ("who to kill" if you get "port already in use")

C/C++

How to clean up after child thread
Non-blocking IO using sockets
Shared Libraries on Linux+GCC
Singleton
std::move Semantics

ElasticSearch

Installation
What You Get
Indexing, Routing, etc.
Deleting
Getting and Multi-Getting
Updating
Search
- Query DSL

ffmpeg

Rip DVD into FLV (or anything else)
Video File with Still Image and Audio

Kyoto Cabinet and Kyoto Tycoon

Setup and Install Kyoto Cabinet
Setup and Install Kyoto Tycoon
KT's RPC API Reference

Linux Administration

Reset Compiz to Default Settings
Enable and Start sendmail
Installing sendmail
Sending Emails using sendmail

MAC OSX

Asynchronous Execution
- NSThread
- performSelectorInBackground
- dispatch_async
MacPorts

$ sudo port selfupdate
$ sudo port upgrade outdated
$ sudo port uninstall inactive
$ (just once) sudo port install port_cutleaves
$ sudo port_cutleaves

MongoDB

Esp. using the PHP PECL driver.

MySQL

Error 1045: Access denied
The insert ... on duplicate key update Pitfall

PDF

Merging PDF Files using GhostScript
Cutting PDF Files using GhostScript
Converting to PDF using GhostScript

PHP

Convert Accented Characters to Non-Accented
Upload a File using cURL
HTTP Post in Pure PHP (without cURL)
Prevent Client Disconnect from Killing PHP
Disconnect Client and Continue Processing

Python

Timing, and memory, on Linux

Security

Password Generators
SSH Access using pubkey's Authentication
Using RSync together with SSH

Subversion/SVN

Simple Guide to SVN Client
Creating a SVN Repository|Creating SVN Repository
Moving a SVN Repository
Change Repository URL (Subversion 1.7+)
Setup a SVN Server on a Shared Hosting with no root Access
creating and applying patch (the --diff-cmd is necessary in case you set some graphical diff-viewer in ~/.subversion/config):

cd root_of_project
svn di --diff-cmd diff > ~/patch.diff
cd root_of_other_project
patch -p0 -i ~/patch.diff

ViM

Delete all lines matching a pattern
Directly type HTML entities
Reformat a plain text paragraph

$ vim -x filename                      - open filename for editing, and save it encrypted (will prompt for a key)
:X                                     - set encryption for current file; use ':set key=' to disable encryption
                                       - put "set cm=blowfish" in your .vimrc to enable safer encryption by default
$ vim +10 [file] ; vim +/hello [file]  - open [file] at line 10, or at first occurrence of pattern 'hello' in file
:w !sudo tee %                         - save file via `sudo` (as root)

Web - HTML, CSS, JS, jQuery, etc.

Multiple Submit Buttons and/or Multiple Forms on Page
Make 'float' Elements Appear One under Another
Upload a File via Form
Override the IE's Problem with width
Make an Element Fill In All the Remaining Space

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