Commands by hypatiafu (0)

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Localize provenance of current established connections
Sample command to obtain a list of geographic localization for established connections, extracted from netstat. Need geoiplookup command ( part of geoip package under CentOS)

Delete all empty lines from a file with vim

Remove a line from a file using sed (useful for updating known SSH server keys when they change)
For example, to remove line 5 from foo, type: vi +5d +wq foo

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"

Fetch the Gateway Ip Address
Better use iproute2 !

List only hidden files
You can omit the -d to see what's inside directories. In that case, you may want -a to see dotfiles inside those directories. (Otherwise you don't need -a since you're explicitly looking at them.)

It decripts all pgp files in a selection folder and move the output into a file.

list block devices
Shows all block devices in a tree with descruptions of what they are.

check open ports without netstat or lsof

for all who don't have the watch command


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