Commands by j4ps (1)

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Find the package that installed a command

check open ports without netstat or lsof

A very simple and useful stopwatch
time read -sn1 (s:silent, n:number of characters. Press any character to stop)

List docker volumes by container

Remove a range of lines from a file
Deletes lines to of a file. You must put the end line first in the range for the curly brace expansion, otherwise it will not work properly.

Use tcpdump to monitor all DNS queries and responses

Mutt - Change mail sender.

Give any files that don't already have it group read permission under the current folder (recursive)
Makes any files in the current directory (and any sub-directories) group-readable. Using the "! -perm /g=r" limits the number of files to only those that do not already have this property Using "+" on the end of the -exec body tells find to build the entire command by appending all matching files before execution, so invokes chmod once only, not once per file.

Display full tree information of a single process

Block all IPv4 addresses that has brute forcing our ssh server
For ipv6 use: grep -oE "\b([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}\b"


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