stdin is the name of the default input file descriptor of a process. Since there is really nothing special about `stdin`, you *should not* use this tag. Use [tag:io-redirection] for questions on how to redirect input, use [tag:file-descriptors] for questions on how to manage file descriptors, use ...

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Text replace literally *all* instances of a string through stdin, stdout

Linux, or specifically Ubuntu 14.04 LTS Server if necessary (and CENTOS 6.5/7 minimal would be nice). If I enter "FOO" at the command line, (regardless of whether as a word or as a substring), I'd ...