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Diff btw Command Substitution And Pipeli

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by pandadude 1 view

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Newbie question:
I'm puzzled at this pt of learning: What's the difference btw the usage of comm. substituion (`) and pipelines (|) ?
I mean HOW do you determine which one to use
to feed Inputs ? They are NOT interchangeale under any circumstanceat all, are they ?
Pls be as specific as u can..I'm pretty new to this. Thanks

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by cavedweller

Command output substitiution is used to place a calculated value into the current command. Piping is used to feed the output of a command into another command (as input to the second command).

For instance, echo "The current directory is "`pwd` would cause the result of the pwd command to be printed at the end of the output line. The command "find . -depth -print | cpio -ocv -Osaveset.cpio" generates a list of filenames (with find) and pipes the list into cpio which saves the files.

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