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I need to execute a set of "piped" commands with altered niceness level. Example:

nice -n 15 command1 | command2 | command3

In this case niceness is altered to "15" only for command1. How to change it for the whole set of commands (command1, command2 and command3)?

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 nice -n 15 sh -c "command1 | command2 | command3"

This sets niceness of a subshell, and the commands 1..3 inherit it.

Edit: Sorry, the parenthesis will not do. There has to be a seperate shell invocation.

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nice -n 15 command1 | nice -n <num> command2 | nice -n <num> command3

nice isn't used differently from any other command.

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