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E
- echo
- echo arguments to the standard output
- ed, 
red
- basic line editor
- eqn, 
neqn, 
checkeq
- typeset mathematics
- error
- categorize compiler error messages, insert at responsible source file lines
- ex, 
edit, 
e
- line editor
- expand, 
unexpand
- expand TAB characters to SPACE characters, and vice versa
- expr
- evaluate  arguments  as a  logical,  arithmetic, or string expression
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