quick commands I often need

compile some latex on source modification, while zathura is showing it

fswatch --event Updated -o "$1" | xargs -n1 -I{} xelatex --shell-escape -interaction batchmode "$@"

image sequence to mp4

ffmpeg -r 24 -i %04d.png -vcodec libx264 -crf 20 -pix_fmt yuv420p output.mp4

mp4 to image sequence

ffmpeg -i video.webm image-%03d.png

start an http server from current directory

python3 -m http.server

set the keyboard up

setxkbmap "$@"
setxkbmap -option "caps:swapescape"
setxkbmap -option keypad:pointerkeys
xset r rate 150  110&
xmodmap -e "keycode 135 = Super_R"
xmodmap -e "keycode 230 = Menu"

generate a password

openssl rand -base64 32

scroll with middle mouse pushed

xinput set-prop "TPPS/2 Elan TrackPoint" "libinput Scroll Method Enabled" 0 0 1
xinput set-prop "Logitech USB Optical Mouse" "libinput Scroll Method Enabled" 0 0 1

### to go back to "normal"
# xinput set-prop "TPPS/2 Elan TrackPoint" "libinput Scroll Method Enabled" 0 0 0
# xinput set-prop "Logitech USB Optical Mouse" "libinput Scroll Method Enabled" 0 0 0

xelatexwatch (to automatically recompile a latex file upon modification)

fswatch --event Updated -o "$1" | xargs -n1 -I{} xelatex --shell-escape -interaction batchmode "$@"

quickly run in parallel

N=8
PROGRAM=$1
shift
for thing in $@; do
	((i=i%N)); ((i++==0)) && wait
	$PROGRAM $thing &
	#task "$thing" &
done

invert pdf colors

IN=$1
OUT=$(basename $1 .pdf)-inverted.pdf

if [ -f "$OUT" ]; then
	echo "$OUT" already exists
else
	convert -density 192x192 "$IN" -density 192x192 -negate -compress zip "$OUT"
fi

the original pdfbook which seems simpler, faster and better than pdfbook2

#!/bin/sh 
##
##  pdfbook: Rearrange pages of one or more PDF files into 2-up signatures
##
##  Author David Firth (http://go.warwick.ac.uk/dfirth), with help
##  from Marco Pessotto
##
##  This is a simple wrapper for pdfjam, version 2.08 
##
case $1 in
    --short-edge)
        shortedge=true ;
        shift ;
        ;;
    *) 
        ;;
esac
for arg
do
    case $arg in
        --signature*)
            ## catches both --signature and --signature*
            signature=true ; break
            ;;
        *) ;;
    esac
done
## 
## If $signature is empty, we need to use a default:
## 
if test -z "$signature" ; then
    signature="--signature 4"
else
    signature=""
fi
##
## Make the call to pdfjam:
##
if test -z "$shortedge"
then 
    exec pdfjam --booklet true --landscape --suffix book $signature "$@"
else
    (kpsewhich everyshi.sty >/dev/null) || {
        echo "the 'everyshi' package is not installed."; exit 1
    }
    exec pdfjam --booklet true --landscape --suffix book $signature \
        --preamble '\usepackage{everyshi}
\makeatletter
\EveryShipout{\ifodd\c@page\pdfpageattr{/Rotate 180}\fi}
\makeatother
' "$@"
fi