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Revision as of 23:18, 25 December 2013 by Admin (Talk | contribs)

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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

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

Other Short Notes

Rip Video DVD that is not Finalized

Install Apache and PHP to do Secure h264 Pseudo Streaming