Iizuki‭

An exclamation mark followed by space in the beginning of a pipeline will negate the final exit code of the pipeline. Here's an example in Bash. Echoing $? will print out the exit code of the prev...

posted 1y ago by Iizuki‭  ·  edited 8mo ago by Iizuki‭

How to find the exact path to an executable file present in your PATH. I.e. commands you can call by just their names. E.g. what executable gets called when I type find and hit enter? $ hypotheti...

3 answers  ·  posted 3mo ago by Iizuki‭  ·  last activity 3mo ago by Ordoviz‭

dmidecode can do this. Here's an example output from my system: # dmidecode --type 2 Getting SMBIOS data from sysfs. SMBIOS 3.1.1 present. Handle 0x0002, DMI type 2, 15 bytes Base Board Info...

posted 7mo ago by Iizuki‭

There's a sha1sum tool in GNU coreutils. Here's $ sha1sum emptyfile da39a3ee5e6b4b0d3255bfef95601890afd80709 emptyfile Note the spaces and the filename (emptyfile in this case) in the output...

posted 7mo ago by Iizuki‭  ·  edited 6mo ago by Iizuki‭

GNU which does the trick: $ which find /usr/bin/find It's very likely already installed.

posted 3mo ago by Iizuki‭

How to apply a logical not to a shell command, e.g. in a Bash script? So if the command exited with 0 (success) I would like it to be changed to a non-zero value, and if it exited with a non-zero ...

1 answer  ·  posted 1y ago by Iizuki‭  ·  last activity 7mo ago by Quasímodo‭

ip a command will conveniently show the addresses assigned to your network interfaces, but oftentimes this is not what the internet sees your machine as. So how to find your public IP address from...

3 answers  ·  posted 11mo ago by Iizuki‭  ·  last activity 9mo ago by Michael‭

How to get the number of lines in a file? I.e. for a file like this: Line one Line 2 Final line I would like to do something like this: $ count-lines /path/to/the/file/above 3

2 answers  ·  posted 9mo ago by Iizuki‭  ·  last activity 7mo ago by Michael‭

xmllint from xmllib2 can do this: $ output-dirty-xml | xmllint --format - The dash in the end tells xmllint to read from stdin instead of a file. Source: manpage

posted 8mo ago by Iizuki‭

How to convert a json file to yaml? Technically json is already valid yaml, but I'm talking about the characteristic easy-to-read yaml formatting with indentation and minimal quotes.

1 answer  ·  posted 7mo ago by Iizuki‭  ·  last activity 7mo ago by Iizuki‭

Desktop files always have either %u or %U as an argument for the program being launched. E.g. here's a line from my firefox.desktop: Exec=/usr/lib/firefox/firefox %u What does it mean?

1 answer  ·  posted 9mo ago by Iizuki‭  ·  last activity 9mo ago by Iizuki‭

They are defined in the Desktop Entry Specification. In fact there are also %f and %F options. They tell the desktop manager how the program handles multiple files. Like if I select a bunch of fil...

posted 9mo ago by Iizuki‭

This is how to save it to a file: $ gpg --export --armor key-id > my-key.pub --armor stands for the format with printable characters.

posted 8mo ago by Iizuki‭

Surely there exists a command to print out the system's mother board model? Opening up the chassis is not an option.

2 answers  ·  posted 7mo ago by Iizuki‭  ·  last activity 7mo ago by Matthias Braun‭

How to list tags of a container in container registry using CLI tools? Kinda like you would browse them visually in dockerhub.

1 answer  ·  posted 6mo ago by Iizuki‭  ·  last activity 6mo ago by Iizuki‭