Display headers from an outlined document

txt.headers

#!/bin/bash -i
# we need debug
file="$1"
sublevels=1
postprocess=cat

for arg
do
    case "$arg" in
	-[1-9])
	    sublevels=${arg:1}
	    ;;
	-n)
	    postprocess=nl
	    ;;
    esac
done
debug grep -E "^\*{1,$sublevels} " "$file"
grep -E "^\*{1,$sublevels} " "$file" | "$postprocess"



12:04:24 ~/NOTES/TXT -1- $ txt.headers linux.info -3 -n | head -20
debug: grep -E ^\*{1,3}  linux.info
     1  * linux memory / swapiness
     2  * Linux distros
     3  ** Voir également
     4  ** Distros linux utilisées
     5  ** NuTyX
     6  ** deepin linux
     7  ** bedrock linux
     8  ** comment savoir ce que c'est comme distro
     9  ** composants
    10  *** installer
    11  *** package manager
    12  *** init system
    13  *** desktop
    14  *** pre-selection of software
    15  ** rolling releases
    16  ** linux distros for phones
    17  * DM pour linux
    18  * virtualization software for linux hosts
    19  * KDE
    20  ** apps
12:04:42 ~/NOTES/TXT -1- $ txt.headers linux.info -2 -n | head -20
debug: grep -E ^\*{1,2}  linux.info
     1  * linux memory / swapiness
     2  * Linux distros
     3  ** Voir également
     4  ** Distros linux utilisées
     5  ** NuTyX
     6  ** deepin linux
     7  ** bedrock linux
     8  ** comment savoir ce que c'est comme distro
     9  ** composants
    10  ** rolling releases
    11  ** linux distros for phones
    12  * DM pour linux
    13  * virtualization software for linux hosts
    14  * KDE
    15  ** apps
    16  ** core components
    17  ** why I like KDE
    18  ** how to get the version of KDE
    19  ** config directory + config files
    20  ** logfiles
12:04:53 ~/NOTES/TXT -1- $