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output the contents of a file removing any empty lines including lines which contain only spaces or tabs.

Bulk install
Like 7172, but much easier.

lotto generator

Use tee + process substitution to split STDOUT to multiple commands
Using process substitution, we can 'trick' tee into sending a command's STDOUT to an arbitrary number of commands. The last command (command4) in this example will get its input from the pipe.

find all non-html files

Show current working directory of a process

Get number of users on a minecraft server
I'm flat-out surprised that minecraft directory services require servers install multiple modifications to their server code, when the directories could fetch this information on their own.

send DD a signal to print its progress
Sends the "USR1" signal every 1 second (-n 1) to a process called exactly "dd". The signal in some systems can be INFO or SIGINFO ... look at the signals list in: man kill

Find the package that installed a command

find process associated with a port
e.g. fuser 25/tcp (see which pid is listening on smtp)


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