How to
If you're looking for how to do something quickly, there might be something in this list for you.
Check the nameserver for a domain
Use nslookup to lookup the nameserver for a domain
Print the number of lines in a file
Use wc to print the number of lines in a file
Remove all local docker images
Use a combination of commands
Remove all local docker volumes
Use a combination of commands
Encrypt/Decrypt using GPG
Use GPG to encrypt/decrypt data.
How to truncate docker logs
Truncate docker logs to clear up disk space
How to use openssl to generate random bytes
Here's a quick trick to use openssl to generate random bytes.
How to look for large files in linux
Use the find command to list large files
How to search for SSH ports
Use nmap to scan SSH ports in a subnet