GREP - Search a file for a pattern

A>grep [-options] pattern [ud:]file [file file ... ] [>output_file]
 
More than one option may be specified.

'file' may be an ambiguous file name, and may include a user/drive
specification.  Example: 12b:foo*.?q?

'pattern' may be enclosed in double quotes ("includes blanks ")
to include white-space.

Grep finds lines in file[s] matching pattern.

Options:

  -v	Variant: all lines except matches
  -c	Count of matching lines
  -l	List of filenames containing pattern
  -n	Line numbers of lines which match
  -i	Lower case pattern will match only lower case in file
  -p    Ask for pattern (allows input of mixed case)
  -t	Verbose, show search detail

The pattern is constructed according to UNIX regular-expression conventions.

The regular-expression defines the pattern to search for. Blank lines
never match.

'x'	An ordinary character (not mentioned below) matches itself.

'\'	The backslash quotes any character.  "\$" matches a dollar-sign.

'^'	A circumflex at the beginning of an expression matches the
	beginning of a line.

'$'	A dollar-sign at the end of an expression matches the end of
	a line.

'.'	A period matches any character except "new-line"

':a'	A colon matches a class of characters described by the following
':d'	character.  ":a" matches any alphabetic, ":d" matches digits,
':n'	":n" matches alphanumerics, ": " matches spaces, tabs, and
': '	other control characters, such as new-line.

'*'	An expression followed by an asterisk matches zero or more
	occurrances of that expression: "fo*" matches "f", "fo"
	"foo", etc.

'+'	An expression followed by a plus sign matches one or more
	occurrances of that expression: "fo+" matches "fo", etc.

'-'	An expression followed by a minus sign optionally matches
	the expression.

'[]'	A string enclosed in square brackets matches any character in
	that string, but no others.  If the first character in the
	string is a circumflex, the expression matches any character
	except "new-line" and the characters in the string.  For
	example, "[xyz]" matches "xx" and "zyx", while "[^xyz]"
	matches "abc" but not "axb".  A range of characters may be
	specified by two characters separated by "-".  Note that
	[a-z] matches alphabetics, while [z-a] never matches.

The concatenation of regular expressions is a regular expression.