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TODO List

  • Image/doc tips:

    • lossless JPEG cropping
    • lossless JPEG rotating (jpegtran -rotate 90 -perfect input.jpg > output.jpg)
    • convert -page A5 input.jpg output.pdf
    • pdfsandwich
    • how to install jpegtran: sudo apt install libjpeg-progs
    • montage image{1,2,3}.png -tile 1x3 -geometry +0+0 images.png
    • mogrify ... *.png
    • djvudigital
    • pdf2djvu
    • jbig2dec
    • http://www.cheapimpostor.com/PDFInspector/
    • pdfimages -list input.pdf
    • pdfimages -all input.pdf prefix
    • pdfimages -png input.pdf prefix
    • pdfinfo input.pdf
    • qpdf --stream-data=uncompress compressed.pdf uncompressed.pdf
    • qpdf uncompressed.pdf compressed.pdf
    • qpdf --qdf --object-streams=disable in.pdf out.pdf
    • enable PDF operations in ImageMagick

  • Audio tips:

    • choose MP3 compression bitrate and quality
    • Compresser en AAC CBR avec FFMpeg sans bibliothèque additionnelle : ffmpeg -i input.wav -c:a aac -b:a 160k output.m4a

  • Windows tips:

    • check uptime command, and add alternative command using systeminfo

  • Linux tips:

    • simpler alternative command to finding text in files using grep with some options?
    • XFCE: add type-related send-to commands in file manager
    • sudo groupadd restricted, sudo usermod -aG restricted jdoe, id jdoe
    • sudo chown root:root /home/jdoe, sudo chmod 755 /home/jdoe, sudo chown jdoe:jdoe sub_dir

  • SFTP basics : get [-r], put [-r], rm, rename, ls, pwd #remote, lcd #local, lpwd #local, !<local_command> exit

  • Java 8:

    • list.stream().anyMatch(Objects::isNull)
    • pathList.sort(Path::compareTo);

  • CLI general:

    • check POSIX compliance of cli-general
    • strace basics
    • Remplacer les retours à la lignes Windows par : cat file | tr "\r\n" "##"
    • Exemple de substitution en perl vers la sortie standard : perl -p -e 's/parent\.VARIABLES\.(\w+)/parent.VARIABLES.X.$1/g' file > file2
    • Exemple de substitution en perl avec remplacement sur place : perl -pi.bak -e 's/parent\.VARIABLES\.(\w+)/parent.VARIABLES.X.$1/g' file
    • Extraction des lignes contenant parent.VARIABLES dans tous les .html : find . -name "*.html" | xargs grep "parent.VARIABLES" | sed -e 's/html:/~/' | cut -d~ -f2- | sort -u
    • Liste des fichiers .html contenant parent.VARIABLES : find . -name "*.html" | xargs grep parent.VARIABLES | cut -d: -f1 | sort -u
    • Ajouter une ligne "toto" avant chaque ligne "tata" : perl -ni.bak -e 'print "toto\n" if $_ =~ /tata/; print;' file
    • Ajouter une ligne "toto" avant la premiere ligne "tata" : perl -ni.bak -e 'BEGIN{$c=0} print "toto\n" if $_ =~ /tata/ and 0 == $c++; print;' file

  • VIM basics:

    • :, /, n, :$, $, R, r, D, dd, C, o, :q, :wq, :q!

  • Facebook:

    • insert an empty first line in a comment : insert a soft hyphen (&#173;) just before the carriage return

  • XML ?

    • xmllint --xpath "//*[local-name()='stage']/@name" $f 2>/dev/null
    • xmllint --format document.xml

  • Windows:

    • install Ubuntu via WSL 2 : PS> wsl --install Ubuntu
    • install Windows Terminal without having access to the Windows Store
    • set default terminal in Windows Terminal
    • add GitBash profil into Windows Terminal
    • GitBash cygpath

  • Kubernetes:

    • k get <kind> --show-labels, k get CiliumNetworkPolicy
    • k delete <kind> <name> -n <namespace>
    • k get account <account>
    • helm list -n <namespace>

  • Git tips:

### Delete untracked files ###

git clean --dry-run # files are not deleted for real
# ...

git clean -f # files are deleted straightaway
# ...

git clean -i # interactive: git asks for what to do
# ...
### Start an interactive rebase session ###

git rebase -i HEAD~$N
# explain