Commands by lgarron (9)
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Resize `file.png` to a 32x32 px image. Use a value other than 32 to create other icon sizes (e.g. 16x16 or 32x32). Combine two favicon sizes using: `convert icon-16px.png icon-32px.png favicon.ico` For a social media preview image, use `2:1#` for the extent and `1200` for the scale.
6convert file.png -background transparent -gravity Center -extent 1:1# -scale 32 file-32px.png -
Use `security list-keychains` to find possible keychains, and `security dump-keychain` to look for certificates. `sudo security delete-certificate` without arguments shows options for removing: by common name or by SHA-1 hash. This is especially useful if a certificate locks up Keychain Access.app, which happens for certificates with many SANs in macOS 10.12. Found via: http://stackoverflow.com/a/16019443
0sudo security delete-certificate -c 1000-sans.badssl.com -
Based on http://stackoverflow.com/questions/13127352/checking-alternative-names-for-a-san-ssl-cert Replace "facebook.com" with the desired hostname. Show Sample Output
1echo "quit" | openssl s_client -connect facebook.com:443 | openssl x509 -noout -text | grep "DNS:" | perl -pe "s/(, )?DNS:/\n/g" -
The internet is full of advice about how to change the caps lock key into a backspace key (a useful practice that originated with Colemak), but a lot of instructions are complicated or outdated. After *lots* of searching for something that still worked on Ubuntu 14.04, I finally found that this simple command is sufficient and takes effect immediately. (Found at: http://www.howtogeek.com/194705/how-to-disable-or-reassign-the-caps-lock-key-on-any-operating-system/ )
0setxkbmap -option caps:backspace -
If you're running a command with a lot of output, this serves as a simple progress indicator. This avoids the need to use `/dev/null` for silencing. It works for any command that outputs lines, updates live (`fflush` avoids buffering), and is simple to understand. Show Sample Output
7alias ...="awk '{fflush(); printf \".\"}' && echo \"\"" -
Specific to OSX. Show Sample Output
1sysctl -a | grep boottime | head -n 1 -
This *does not change the video encoding*, so it's fast (almost purely I/O-bound) and results in a file of nearly the same size. However, OSX (and possibly other programs) will more easily play/seek the file when wrapped as MOV. For example, you can QuickLook the resulting file. This basically does the same as the commercial ClipWrap program, except using the free program ffmpeg. Show Sample Output
0ffmpeg -i "input.mts" -vcodec copy -acodec pcm_s16le "output.mov" -
1touch -r "source_file" "destination_file"
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Very convenient to for sending data to the clipboard for processing. However, note that tee will affect the buffering of the output (stdout won't be update very live). Show Sample Output
0alias t="tee >(pbcopy)"
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