IMAGEMAGICK

Convert all HEIC files in current directory to jpg:

magick mogrify -format jpg *.HEIC  

Convert all HEIC files in current directory and any/all subdirectories to jpg:

(Following is given for Windows, check on bash/zsh for-in loop syntex.)

FOR /R %a IN (*.heic) DO magick mogrify -format jpg "%~a"  

Imagemagick shrink pdf:

convert -density 120 -quality 10 -compress jpeg original.pdf output.pdf  

Other pdf conversions

Super simple ps2pdf:

ps2pdf input.pdf output.pdf  

Ghostscript:

gs -dQUIET -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -dPDFSETTINGS=/printer \ -sOutputFile=outputfilename.pdf inputfilename.pdf  

pdfsizeopt installed via Homebrew did not work for me

FFMPEG

Convert an input media file to a different format, by re-encoding media streams:

ffmpeg -i input.avi output.mp4  

Set the video bitrate of the output file to 64 kbit/s:

ffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4  

###Force the frame rate of the output file to 24 fps:

ffmpeg -i input.avi -r 24 output.mp4  

Force the frame rate of the input file (valid for raw formats only) to 1 fps and the frame rate of the output file to 24 fps:

ffmpeg -r 1 -i input.m2v -r 24 output.mp4  

The format option may be needed for raw input files.

Sample from ShotStack that reduces size too:

ffmpeg -i input.mov -c:v libx264 -pix_fmt yuv420p -crf 28 -vf scale=-1:720 output.mp4  

-i input.mov: - specifies the input video file.  
-c:v libx264: - sets the video compression codec to H.264 (libx264).  
-pix_fmt yuv420p - changes the ProRes pixel format (4:2:2) to H.264 compatible pixel format (4:2:0).  
-output.mp4 - the name of the output file.  

Could be some errors with that last one.

To reduce the filesize going to H265 is a big reduction:

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4  

…but QuickTime Player barfs for reasons I do not understand, however, the fix is simple:

ffmpeg -i input.mp4 -c copy -tag:v hvc1 output.mp4  

as long as there is no re-encoding. See Apple Discussions

REGEX

using capture groups () :the value in first group is \1

%s/\s\(\d\)/\r\1/g  

Option 1 would be achieved by :set textwidth=30
Then you can reformat your text by highlighting it (in visual mode) and typing gq. Textwidth can be abbreviated as tw, thus :set tw=30.

Things afoot or to try:
ohmyzsh: have it, colorful
pass: password manager, still using Google and Apple happily
terminal: not sure what this means, am happy with MacOSTerminal
neovim: no noticeable benefit except maintenance by a group
kitty: tried it but meh, can’t remember what it did
fzf: also have, can be useful
tldr: this is great

To be sure:
\[x=\]

Left-Aligned	Center Aligned	Right Aligned
col 3 is	some wordy text	$1600
col 2 is	centered	$12
zebra stripes	are neat	$1

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