Pages on John Stowers

Python Print / String Format Reference

Tue, 26 Feb 2013 10:31:37 +0000

Bash Cheat Sheet

Make Quick Reference

Fri, 15 Jul 2011 14:38:30 +0000

This page contains a minimal GNU Make reference, adapted for my use from

The official quick reference

Automatic Variables:

Here is a summary of the automatic variables. See Automatic Variables , for full information.

$@ The file name of the target.
$% The target member name, when the target is an archive member.
$< The name of the first prerequisite.
$? The names of all the prerequisites that are newer than the target, with spaces between them.
$+
$^ The names of all the prerequisites, with spaces between them.

The value of $^ omits duplicate prerequisites, while $+ retains them and preserves their order.

Autotools Quick Reference

Tue, 03 Nov 2009 07:44:22 +0000

You can use then the following basic autotools setup, which is just 9 lines. You can start from here and add more stuff (including libtool).

configure.ac:

AC_INIT([package], [version]) AM_INIT_AUTOMAKE([foreign]) AC_CONFIG_SRCDIR([configure.ac]) AC_CONFIG_HEADERS([config.h]) # not even really needed AC_PROG_CC # or AC_PROG_CXX AC_CONFIG_FILES([Makefile]) AC_OUTPUT

Makefile.am:

bin_PROGRAMS = hello hello_SOURCES = hello.c

That’s enough for:

$ autoreconf -fvi $ ./configure $ make

On top of this, for each package you need, you add:

Altium Designer Tips

Tue, 01 Apr 2008 12:24:36 +0000

Note [PCB+SCH] means command is available in PCB and Schematic mode, [PCB] means it is only available in the PCB editor. _View » Desktop Layouts » descrives navigating the View menu.

You Favorite Keyboard Shortcuts

[PCB+SCH] Space to rotate components, change routing orientation
[PCB+SCH] Tab to change properties of the component you are placing
[PCB+SCH] Page Up/Down zooms in and out of the design
[PCB+SCH] Ctrl+Mousewheel zooms in/out
[PCB+SCH] Shift+Mousewheel pans left/right

Unix Commands

Wed, 17 Oct 2007 20:38:47 +0000

Command List

General Commands

Command	Description
`apropos word`	Show commands pertinent to word.
`which command`	Show full path name of command
`time command`	See how long a command takes
`time cat`	Start stopwatch. Ctrl-D to stop.
`nice info`	Run a low priority command (info in this case)
`renice 19 -p $$`	Make shell (script) low priority. Use for non interactive tasks
`look prefix`	Quickly search (sorted) dictionary
`gpg -c file`	Encrypt file
`gpg file.gpg`	Decrypt file
`watch -n1 'cat /proc/interrupts'`	Watch changeable data continuously
`alias hd='od -Ax -tx1z -v'`	Handy hexdump
`alias rp='readlink -f'`	Canonicalize path.
`touch -c -t 0304050607 file`	Set file timestamp (YYMMDDhhmm)

Command	Description
`cd -`	Go to previous directory
`cd`	Go to home directory
`(cd dir && command)`	cd, execute a command and return
`pushd .`	Put current dir on stack so you can popd back to it

CD Commands

Command	Description
`gzip < /dev/cdrom > cdrom.iso.gz`	Save copy of data cdrom
`mount -o loop cdrom.iso /mnt/dir`	Mount the cdrom image at /mnt/dir (read only)

Vim Cheat Sheet

Wed, 17 Oct 2007 20:37:03 +0000

Working with files

Vim command

Action

:e filename

Open a new file. You can use the Tab key for automatic file name completion, just like at the shell command prompt.

:w filename

Save changes to a file. If you don’t specify a file name, Vim saves as the file name you were editing. For saving the file under a different name, specify the file name.

Quit Vim. If you have unsaved changes, Vim refuses to exit.

Bash Cheat Sheet

Wed, 17 Oct 2007 20:35:37 +0000

This file contains short tables of commonly used items in this shell. In most cases the information applies to both the Bourne shell (sh) and the newer bash shell.

The best resource for understanding existing shell scripts is explainshell

Good practices:

::::bash
#!/bin/bash #Explicitly tell shell this is a bash script
set -e #Exit as soon as any line in the bash script fails
set -x #Prints each command executed (prefix with ++)
set -ex #Do both (for good practice)
set -u #Exit if a referenced variable is not declared

Tests (for ifs and loops) are done with [ ] or with the test command.

Reference

Wed, 17 Oct 2007 20:33:02 +0000

These pages contain a small amount of reference information that I frequently refer to. They may be usful to others so I am publishing them here.

Altium Designer Tips

About Me

Sun, 25 Jun 2006 22:16:09 +0000

Hey, I’m a Postdoc , working in collaboration with Strawlab and TU Wien . We study the visual flight control behaviour of freely flying Drosophila using panoramic virtual reality.

I am currently living in Vienna, Austria.

Contact Details:

Email:
Blog: http://www.johnstowers.co.nz

I grew up on a dairy farm in a small town called Te Aroha. I have one sister, also a graduate of the University of Canterbury. My Undergraduate degree was in Electrical Engineering. I then completed a Masters in Engineering management, looking at commercializing and monetization of Open Source projects, including open source hardware designs.

git-cheat-sheet

Mon, 01 Jan 0001 00:00:00 +0000

Git cheat sheet

Configure tooling
git config –global user.name “[name]”
- Sets the name you want attached to your commit transactions
git config –global user.email “[email address]”
- Sets the email you want attached to your commit transactions
git config –global color.ui auto
- Enables helpful colorization of command line output
git config –global push.default current
- Update a branch with the same name as current branch if no refspec is given
git config –global core.editor [editor]

Python Cheat Sheet

Mon, 01 Jan 0001 00:00:00 +0000

http://mkaz.com/solog/python-string-format

Pages on John Stowers

Python Print / String Format Reference

Make Quick Reference

Autotools Quick Reference

Altium Designer Tips

You Favorite Keyboard Shortcuts

Unix Commands

Command List

General Commands

Directory Navigation

CD Commands

Archives

Vim Cheat Sheet

Bash Cheat Sheet

Reference

About Me

git-cheat-sheet

Git cheat sheet

Python Cheat Sheet

Pages on John Stowers

Python Print / String Format Reference

Make Quick Reference

Autotools Quick Reference

Altium Designer Tips

You Favorite Keyboard Shortcuts

Unix Commands

Command List

General Commands

Directory Navigation

CD Commands

Archives

Vim Cheat Sheet

Bash Cheat Sheet

Reference

Computer Related

Electronics Related

About Me

git-cheat-sheet

Git cheat sheet

Python Cheat Sheet