Commands by lgarron

Commands by lgarron (10)

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Print macOS current power delivery max wattage

Print the max wattage of the current power draw source for a Mac. Note that the current amount of watts drawn may be lower, particularly if a high-wattage adapter is plugged into a Mac that has a full battery. Show Sample Output
This is sample output - yours may be different.
```
      Wattage (W): 140
```
1

system_profiler SPPowerDataType | grep Wattage

lgarron · 2023-07-06 17:58:00 192
Create a square thumbnail or favicon using ImageMagick

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.
This is sample output - yours may be different.
8

convert file.png -background transparent -gravity Center -extent 1:1# -scale 32 file-32px.png

lgarron · 2023-03-08 04:11:12 592
Delete a certificate from the macOS security keychain

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
This is sample output - yours may be different.
0

sudo security delete-certificate -c 1000-sans.badssl.com

lgarron · 2017-04-06 01:40:04 21
Get the SAN (subjectAltName) of a site's certificate.

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
This is sample output - yours may be different.
```
depth=1 /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
verify error:num=20:unable to get local issuer certificate
verify return:0
DONE

*.facebook.com
facebook.com
*.fb.com
fb.com
*.fbsbx.com
*.fbcdn.net
*.xx.fbcdn.net
*.xy.fbcdn.net
*.xz.fbcdn.net
*.m.facebook.com
*.messenger.com
messenger.com
```
1

echo "quit" | openssl s_client -connect facebook.com:443 | openssl x509 -noout -text | grep "DNS:" | perl -pe "s/(, )?DNS:/\n/g"

lgarron · 2015-08-13 22:50:45 9
Change caps lock to backspace (Works on Ubuntu 14.04)

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/ )
This is sample output - yours may be different.
0

setxkbmap -option caps:backspace

lgarron · 2014-10-27 22:53:39 8
Print one . instead of each line

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
This is sample output - yours may be different.
```
$ ls ~ | ...
..............
```
7

alias ...="awk '{fflush(); printf \".\"}' && echo \"\""

lgarron · 2014-02-22 22:20:22 15
Find last reboot time

Specific to OSX. Show Sample Output
This is sample output - yours may be different.
```
kern.boottime = Wed Jan 22 00:41:33 2014
```
1

sysctl -a | grep boottime | head -n 1

lgarron · 2014-01-24 13:03:48 7

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

ffmpeg -i "input.mts" -vcodec copy -acodec pcm_s16le "output.mov"

lgarron · 2014-01-24 13:00:07 6

Copy modification timestamp from one file to another.
This is sample output - yours may be different.
1

touch -r "source_file" "destination_file"

lgarron · 2014-01-24 12:50:49 6
Copy to clipboard in addition to stdout (OSX).

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
This is sample output - yours may be different.
```
$ echo "Hi" | t
Hi
$ pbpaste
Hi
```
0

alias t="tee >(pbcopy)"

lgarron · 2014-01-24 12:41:07 9

What's this?

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Selecting a random file/folder of a folder

Also looks in subfolders

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

List your MACs address

The output of ifconfig is localized, using it will fail in non-English environment. "ip" command in iproute2 provides a consistent output and thus is more robust

Insert the last argument of the previous command

for example if you did a: $ ls -la /bin/ls then $ ls !$ is equivalent to doing a $ ls /bin/ls

Rename files in batch

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

shell function to underline a given string.

underline() will print $1, followed by a series of '=' characters the width of $1. An optional second argument can be used to replace '=' with a given character. This function is useful for breaking lots of data emitted in a for loop into sections which are easier to parse visually. Let's say that 'xxxx' is a very common pattern occurring in a group of CSV files. You could run $ grep xxxx *.csv This would print the name of each csv file before each matching line, but the output would be hard to parse visually. $ for i in *.csv; do printf "\n"; underline $i; grep "xxxx" $i; done Will break the output into sections separated by the name of the file, underlined.

Signals list by NUMBER and NAME

This command seems to achieve the similar/same goal.

list block devices

Shows all block devices in a tree with descruptions of what they are.

Preview of a picture in a terminal

This command allows you to see a preview of a picture via the terminal. It can be usefull when you are ssh'ing your server without X-forwarding. To have en example of the output you can get with this command see http://www.vimeo.com/3721117 Download at http://inouire.net/image-couleur.html Sources here: http://inouire.net/archives/image-couleur_source.tar.gz

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