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 Documented in Volume 1 of the UNIX Programmers Manual.

 % echo string
  will list the specified string to the standard output.

 % echo -n string
  as above, but use no newline on output.

 % echo *
  will list the files in the current directory.

 % echo "*"
  will list the character *

 % echo \!junk
  will list the literal string !junk

 % echo "''"
  will list the literal string ''

 % echo '""'
  will list the literal string ""

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