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I/O redirection is used in shell scripting. This feature enables one to take the output of a command and redirect it as an input for another command, or a command can take the input from a file instead of from the standard input stream or from the terminal. The whole process helps connect data streams in various ways.

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I want to invoke a command for every line of the standard input, much like xargs, but the line should be passed as standard input, not as a command-line argument: cat some-file.txt | <magic> | wc -c …
asked Sep 26 '13 by Tgr