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exis not mandated to support+commandsyntax, and also (b) it is very brittle if used in scripting as the non-existence offile2will hangexup waiting on user input. See my answer for a version that avoids these pitfalls.file2is not readableexwill still wait forever. Ifexis unable to write the changes tofile1it will wait forever. Any error will makeexwait for user input. For a scripted use ofex, you should never do otherwise than feeding it commands in a way that guarantees it will receive an EOF (such as using a pipe or heredoc).