177 lines
4.6 KiB
Plaintext
177 lines
4.6 KiB
Plaintext
; ===========================
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; NIXOS
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; ===========================
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% nixos
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# Rebuild a flake system derivation
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sudo nixos-rebuild <type> --flake .#<flake>
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$ type: echo -e "switch\nbuild\nboot"
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$ flake: echo -e "nixinator\nnixtop"
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% nixos
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# Find out why a package is included in the closure when building the system derivation
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nix why-depends /run/current-system nixpkgs#<package>
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% nixos
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# Find the storepath of an executable in the users path
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readlink -f $(which <executable>)
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$ executable: bash -c "compgen -c"
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% nixos
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# Find the wanted dynamic libraries of an executable in the users path
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ldd $(readlink -f $(which <executable>))
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$ executable: bash -c "compgen -c"
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; ===========================
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; SYSTEMD
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; ===========================
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% systemd
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# List failed system units
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sudo systemctl --failed
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% systemd
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# List failed user units
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systemctl --user --failed
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% systemd
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# List system errors
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sudo journalctl -p 3 -xb
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% systemd
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# List kernel errors
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sudo journalctl -p 3 -xb -k
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% systemd
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# List system unit errors
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sudo journalctl -xb --unit=<unit>
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$ unit: sudo systemctl list-units --type=service --all --full --no-pager --legend=false --plain | awk -F' ' '{print $1}'
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% systemd
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# List user unit errors
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journalctl -xb --unit=<unit>
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$ unit: systemctl --user list-units --type=service --all --full --no-pager --legend=false --plain | awk -F' ' '{print $1}'
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; ===========================
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; SHELL
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; ===========================
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% shell
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# Launch a detached process with suppressed output
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<command> &>/dev/null &; disown
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% shell
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# Generate a large text file
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yes "The quick brown fox jumps over the lazy dog" | head -c <size> > <output>
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% shell
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# For-loop in fish shell
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for o in <objects>; <action>; end
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% shell
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# Find files larger or smaller than a specified size in the current directory
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fd --type file --size <mode><size> -- "<regex>" .
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$ mode: echo -e "+\t\tFind Larger Files\n-\t\tFind Smaller Files" --- --column 1
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% gdu
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# Visualize storage usage on all mounted disks
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sudo gdu -d
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% duf
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# List all mounted devices
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sudo duf
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% duf
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# Display INode information of all mounted devices
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sudo duf -inode
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% awk
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# Select a column
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awk -F<separator> '{print $<print>}'
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$ separator: echo -e "' '\t\tWhitespace\n'[ ]'\t\tSingle Space\n'\\\t'\t\tTabs" --- --column 1
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% mime
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# Determine the mime-type of a file
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file --mime-type <file>
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$ file: eza -f -1
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% mime
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# Query the default app for a mime type
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xdg-mime query default <mimetype>
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% mime
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# Query the default app for a file
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xdg-mime query default $(file --mime-type <file> | awk -F' ' '{print $2}')
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$ file: eza -f -1
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; ===========================
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; CODE
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; ===========================
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% code
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# Disassemble an object file
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objdump -d -S -M <arch>,<syntax> "<file>" | bat -l nasm
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$ arch: echo -e "x86-64\t\t64 Bit\ni386\t\t32 Bit\ni8086\t\t16 Bit" --- --column 1
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$ syntax: echo -e "intel\t\tIntel Syntax\natt\t\tAT&T Syntax" --- --column 1
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$ file: eza -f -1
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; ===========================
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; DOCS
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; ===========================
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% docs
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# Extract svg figure from pdf page
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pdftocairo -f <page> -l <page> -svg "<input>" "<output>"
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$ input: eza -f -1
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; ===========================
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; YT-DLP
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; ===========================
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% yt-dlp
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# Download mp4 video in best quality
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yt-dlp -f 'bv*[ext=mp4]+ba[ext=m4a]/b[ext=mp4] / bv*+ba/b' --recode-video mp4 "<url>"
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% yt-dlp
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# Download mp3 video in best quality
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yt-dlp -f 'ba' --extract-audio --audio-format mp3 "<url>"
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% spotdl
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# Download spotify playlist
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spotdl --config /home/christoph/.spotdl/config.json --user-auth --format m4a --bitrate disable --threads 24 --generate-lrc --m3u "<name>" download "<url>"
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; ===========================
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; FFMPEG
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; ===========================
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% ffmpeg
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# Create a slow motion version of a video with interpolated/blended frames
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ffmpeg -i "<input>" -filter:v "minterpolate='mi_mode=mci:mc_mode=aobmc:vsbmc=1:fps=<doublefps>',setpts=2*PTS" output.mp4
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$ input: eza -f -1
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% ffmpeg
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# Detect black bar dimensions automatically by looking at the first 10 frames
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ffmpeg -i "<input>" -vframes 10 -vf cropdetect -f null -
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$ input: eza -f -1
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% ffmpeg
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# Preview video with applied crop settings
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ffplay -vf crop=<width>:<height>:<x>:<y> "<input>"
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$ input: eza -f -1
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% ffmpeg
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# Re-encode the video with applied crop settings
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ffmpeg -i "<input>" -vf crop=<width>:<height>:<x>:<y> -c:a copy output.mp4
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$ input: eza -f -1
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% ffmpeg
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# Reencode and compress the video using the h265 codec
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ffmpeg -i "<input>" -vcodec libx265 -crf <quality> "out_<input>"
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$ input: eza -f -1
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$ quality: echo -e "24\n25\n26\n27\n28\n29\n30\n"
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% ffmpeg
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# Reencode and compress multiple videos using the h265 codec
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fish -c "for name in <files>; ffmpeg -i '$name' -vcodec libx265 -crf <quality> 'out_$name'; end"
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$ quality: echo -e "24\n25\n26\n27\n28\n29\n30\n"
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