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Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

show ALL iptable rules
show your current iptable rules from every available iptable table

Bring the word under the cursor on the :ex line in Vim
Very handy to bring the word currently under the cursor into a :s command in Vim. Example: If the cursor was on the word "eggs": :s/ ==> :s/eggs

Compare a remote dir with a local dir
You can compare directories on two different remote hosts as well: $ diff -y

Sort installed rpms by decreasing size.
It's all said in the title.

currently mounted filesystems in nice layout
since fuse mounts do not appear in /etc/mtab (fuse can't write there, dunno if it would if it could) this is propably a better way.

Add prefix onto filenames
Best to try first with -n flag, to preview

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

tcpdump whole packets to file in ascii and hex with ip adresses instead of hostname

Short one line while loop that outputs parameterized content from one file to another
There is a common command for outputting a field or list of fields from each line in a file. Why wouldn't you just use cut?


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