commands.md
modified June 25, 2020.I keep around a file called commands.md which is a gigantic list of tiny how-tos. Whenever I catch myself spending forever finding the right commands to run, I add to this list.
Here are some of those how-tos that I find myself referencing all the time. (newest first)
Compress pngs
for file in *.png; do pngcrush -ow "$file"; doneCompress gifs
gifsicle -O3 --colors 256 --batch -i *.gifSetting up swap
Storing 1024 * 1M of swap in /var/swap.1
sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
sudo chmod 0600 /var/swap.1
sudo /sbin/mkswap /var/swap.1Enable:
sudo /sbin/swapon /var/swap.1Add to /etc/fstab to start swap on boot:
/var/swap.1 swap swap defaults 0 0(from https://stackoverflow.com/a/17173973)
Set a debugger breakpoint before page reload
addEventListener('beforeunload',()=>{debugger})Patch pip packages from source
e.g. for https://github.com/rkern/line_profiler:
git clone https://github.com/rkern/line_profiler.git
find line_profiler -name '*.pyx' -exec cython {} \;
# do some edits
cd line_profiler && pip install . --user Installing AUR package from source (PKGBUILD file)
make sure the base-devel group is installed
sudo pacman -S base-develthen e.g. for https://aur.archlinux.org/packages/bluez-utils-compat/:
git clone https://aur.archlinux.org/bluez-utils-compat.git
# -s installs build deps, -r uninstalls them after build
makepkg -sr
# -i installs
makepkg -iother flags you can add to makepkg -sr:
-A to ignore architecture restriction
-c to remove build files after a successful buildbash script: cd to where the script is
cd "${0%/*}"imagemagick change image white to transparency
mogrify -transparent white image.pngwith fuzzy matching:
mogrify -transparent white -fuzz 10% image.pnginstall packages in octave
e.g. to install symbolic:
pkg -forge install symbolic
pkg load symbolicadd to ~/.octaverc to load on startup:
pkg load symbolicStrategy notes for Chu Shogi