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Prepend a text to a file.
Using the sed -i (inline), you can replace the beginning of the first line of a file without redirecting the output to a temporary location.

list files recursively by size

Scroll up (or Down (PgDn)) in any terminal session (except KDE)

Run command from another user and return to current

Sed can refference parts of the pattern in the replacement:

Show total disk space on all partitions
show off how big your disks are

Check syntax of remote ruby file

This will allow you to browse web sites using "-dump" with elinks while you still are logged in
README: This require you to login on facebook with elinks without using '-dump' first time and when you have logged in you will then be able to dump all data from facebook without any advanced combos, dump is all you need for see all your friends newsfeed or whatever you wish to view in cli/terminal. Facebook is just an example, same requirements for all websites that have a login form.

Find all dot files and directories

See entire packet payload using tcpdump.
This command will show you the entire payload of a packet. The final "s" increases the snaplength, grabbing the whole packet.

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