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ed is a line-oriented text editor.
It is used to create, display, modify, and otherwise
manipulate text files, both interactively and via shell
scripts. A restricted version of ed, `red', can only edit
files in the current directory and cannot execute shell
commands. ed is the `standard' text editor in the sense
that it is the original editor for Unix, and thus widely
available. For most purposes, however, it is superseded by
full-screen editors such as Emacs.
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