Sam is a text editor under the Plan 9 operating system. There are Microsoft Windows and X Window System ports available. sam was originally designed by Rob Pike in the early 1980s for the DMD 5620 , Bell Labs' windowing terminal.
It aims to emulate the ed editor, but with extended capabilities, such as editing multiple files at once. It does this by opening a window dedicated to "watching" each file, and standard ed commands can be, in a sense, directed to the current file set.
Real editing power is offered by Plan 9's mouse chording capabilities, however this is available to any Plan 9 window, whether terminal or editor, not just sam.
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