parallel is a command in Linux that allows you to run multiple commands simultaneously. It is particularly useful when you need to perform the same task on multiple inputs at the same time.

Here are some examples of how to use the parallel command:

• To run multiple commands in parallel, simply list them one after the other, separated by &:

command1 &
command2 &
command3 &

• To run multiple commands in parallel and use the output of one command as input to another command:

command1 | parallel --pipe command2

• To run multiple instances of a command with different arguments in parallel:

echo arg1 arg2 arg3 | parallel -j+0 --colsep ' ' command

• To run multiple commands in parallel and limit the number of commands that can run at the same time:

parallel --jobs 4 command1 command2 command3 command4

• To run a command on multiple files in parallel:

find . -name '*.txt' -print0 | parallel -0 command 

Note that parallel can be used to run command on multiple files, or process multiple inputs in parallel and can save a lot of time when dealing with large dataset and multiple computation.

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