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An Ignorant Wanderer
Asked: 2020-07-20 13:49:19 +0800 CST

Wait for previous command to finish while using tee

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I'm using tee as follows:

some commands | tee -a >(command1 >> file) >(command2 >> file) >(command3 >> file)

How can I delay the execution of command2 till command1 ends, and same for command3 and command2? I tried using wait like this, but it didn't work:

some commands | tee -a >(command1 >> file) >(wait command2 >> file) >(wait command3 >> file)
command-line tee

1 Answers

  1. Best Answer

    Looks like there is some logic missing along with syntax errors.

    tee -a will pass output to STDOUT and append simultaneously, no need to use >

    And why so many output redirects? May be you should utilize && or ;

    Not sure what commands you running but below might give you at least an idea.

    some commands | tee -a file; command1 >> file; command2 >> file; command3 >> file

    some commands | tee -a file will show STDOUT and write to file, regardless of the exit code, because there is ; next command1 >> file will be executed then command2 and then command3 and so on.

    some commands | tee -a file; command1 | tee -a file; command2 | tee -a file; command3 | tee -a file

    Here every command set divided by ; will be executed in order from left to right and also every command output will be shown in STDOUT

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