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72
how_to
72
how_to
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@ -287,6 +287,10 @@ PDF :
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Master PDF Editor (free version):
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https://code-industry.net/free-pdf-editor/
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trizen -S masterpdfeditor
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Decrypt pdf files:
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# For example when pdftk spews this error:
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# `Error: Invalid PDF: unknown.encryption.type.r`
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qpdf --decrypt input.pdf output.pdf
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D-Bus :
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To reload service files /usr/share/dbus-1/services/
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@ -321,8 +325,20 @@ Drag & drop files:
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Fix hardware clock (with chrony / NTC):
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sudo chronyc
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# Diagnose
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activity
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sources
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tracking
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# Bring NTP online
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online
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# Force step
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makestep
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# Synchronize hardware clock with system clock
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trimrtc
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quit
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Alternative to trimrtc:
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sudo hwclock --systohc
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@ -434,6 +450,28 @@ Video and audio editing:
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Your text here # Actual text
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# Mandatory empty line
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ffmpeg -i in.mp4 -vf "scale=512:-2:flags=lanczos,split[x][z];[z]palettegen[y];[x][y]paletteuse,subtitles=text.srt:force_style='FontName=Oswald,Fontsize=80,FontWeight=Bold'" -r 10 out.gif
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mp3 to video:
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# https://shkspr.mobi/blog/2020/02/posting-audio-to-twitter/"
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# Waveform
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ffmpeg \
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-i input.mp3 \
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-filter_complex "[0:a]showwaves=s=640x480:mode=line,format=yuv420p[v]" \
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-map "[v]" \
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-map 0:a \
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-c:v libx264 \
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-c:a copy \
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out.mkv
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# Still image
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ffmpeg \
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-loop 1 \
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-i image.jpg \
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-i audio.mp3 \
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-c:v libx264 \
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-tune stillimage \
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-c:a copy \
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-pix_fmt yuv420p \
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-shortest \
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out.mp4
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ImageMagick:
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crop to aspect ratio
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@ -1105,6 +1143,7 @@ Mounting .bin/.cue image files:
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Manual IMAP connection:
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# https://www.atmail.com/blog/imap-101-manual-imap-sessions/
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# https://stackoverflow.com/questions/14959461/how-to-talk-to-imap-server-in-shell-via-openssl
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# https://gist.github.com/fedir/1d8f8fb8a5f80090705ef7793936216a²
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$ openssl s_client -connect <imap server>:993 -crlf [-quiet]
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$ openssl s_client -connect <imap server>:143 -crlf -starttls imap [-quiet]
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@ -1114,6 +1153,9 @@ Manual IMAP connection:
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A2 list "" "*"
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# list everything under a particular prefix
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A3 list "INBOX" "*"
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# Or:
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# (will print current UIDVALIDITY (useful for fixing mbsync))
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A4 select inbox
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A99 logout
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gdb tricks:
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@ -1291,3 +1333,33 @@ Fix chromium microphone autogain (qutebrowser):
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# https://github.com/qutebrowser/qutebrowser/discussions/6628
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# https://bugs.chromium.org/p/chromium/issues/detail?id=435112
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Blender:
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Display vertex indices (blender >= 2.8):
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# https://blender.stackexchange.com/a/158495
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# https://devtalk.blender.org/t/how-to-enable-the-vertex-indices-overlay-over-each-vertex/15491/4
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- Edit > Preferences > Interface > Developer Extras (enable)
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- Edit Mode
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- Overlays (dropdown, top-right) > Indices (enable) (under: "Developer")
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Jupyter:
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Clear notebook of output data for publishing:
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# https://stackoverflow.com/a/47774393/5309963
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# In-place version
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jupyter nbconvert --clear-output --inplace my_notebook.ipynb
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# Or to write to a new file
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jupyter nbconvert --clear-output \
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--to notebook --output=my_notebook_no_out my_notebook.ipynb
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Check SSL/TLS certificate expiration date:
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echo | openssl s_client -servername <name.example.tld> -connect <example.tld>:443 2>/dev/null | openssl x509 -noout -dates
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List files in chronological order with ls:
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# https://shkspr.mobi/blog/2020/12/anatomy-of-an-ls-command/
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ls -trhgGN --color=always | cut -d" " -f3-
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Change default java environment (archlinux):
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# https://wiki.archlinux.org/title/Java#List_compatible_Java_environments_installed
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archlinux-java status
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# Example
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archlinux set java-18-openjdk
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