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 1y 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 7mo ago by Iizuki‭  ·  last activity 7mo ago by Ordoviz‭

How to convert a markdown file to PDF? The final PDF output should represent the rendered markdown file. Bonus points if the method also preserves colored emojis. Both CLI and GUI solutions are we...

2 answers  ·  posted 4mo ago by Iizuki‭  ·  last activity 4mo ago by samcarter‭

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 11mo 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 11mo ago by Iizuki‭  ·  edited 10mo ago by Iizuki‭

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

posted 7mo 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 11mo 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 1y ago by Iizuki‭  ·  last activity 1y 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 1y ago by Iizuki‭  ·  last activity 12mo 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 1y 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 12mo ago by Iizuki‭  ·  last activity 11mo ago by Iizuki‭

uname, short for Unix Name, is part of GNU coreutils, and thus very likely already installed: $ uname --kernel-release 6.13.3-...

posted 30d ago by Iizuki‭

GPG stores keys inside an internal database of some sort. How to export your public key in the familiar -----BEGIN PGP PUBLIC KEY BLOCK----- format so that it can be imported to other software? E.g...

2 answers  ·  posted 12mo ago by Iizuki‭  ·  last activity 10mo ago by Michael‭

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 10mo ago by Iizuki‭  ·  last activity 10mo ago by Iizuki‭

Suppose the machine is short on memory and the OOM Killer has selected a target process to shut down (in order to reclaim memory). How does the OOM killer actually kill the process? Is it done usi...

1 answer  ·  posted 5mo ago by Iizuki‭  ·  edited 5mo ago by Karl Knechtel‭