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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"

Exclude inserting a table from a sql import
Starting with a large MySQL dump file (*.sql) remove any lines that have inserts for the specified table. Sometimes one or two tables are very large and uneeded, eg. log tables. To exclude multiple tables you can get fancy with sed, or just run the command again on subsequently generated files.

Copy your SSH public key on a remote machine for passwordless login - the easy way

Check syntax for all PHP files in the current directory and all subdirectories

for all flv files in a dir, grab the first frame and make a jpg.
This is handy for making screenshots of all your videos for referring to in your flv player.

easily find megabyte eating files or directories

grep for tabs without using Ctrl-V trick
-P tells grep to use perl regex matches (only works on the GNU grep as far as I know.)

Update all Docker Images

reset Mageia urpmi media sources to network only
On Mageia (and Mandriva) Linux, this command will clear your existing urpmi configuration and configure it to use only network sources. It can be useful after you have installed from CD/DVD and don't want to continually be prompted to insert CD/DVD each time you install a package. acknowledgement: blino

Test for Weak SSL Ciphers
...if you get a certificate back, the server is accepting weak SSL ciphers


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