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Annotation of coherent/a/usr/man/MULTI/egrep, revision 1.1

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        !             2: 
        !             3: egrep                        Command                        egrep
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        !             8: Extended pattern search
        !             9: 
        !            10: eeggrreepp [_o_p_t_i_o_n ...] [_p_a_t_t_e_r_n] [_f_i_l_e ...]
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        !            12: egrep is  an extended and  faster version of  grep.  It  searches
        !            13: each  file for  occurrences  of pattern  (also  called a  regular
        !            14: expression).  If  no file is specified,  it searches the standard
        !            15: input.  Normally, it prints each line matching the pattern.
        !            16: 
        !            17: ***** Wildcards *****
        !            18: 
        !            19: The simplest patterns accepted by egrep are ordinary alphanumeric
        !            20: strings.  Like  eedd, eeggrreepp can also  process _p_a_t_t_e_r_n_s that include
        !            21: the following wildcard characters:
        !            22: 
        !            23: ^   Match beginning  of line, unless it appears immediately after
        !            24:     `[' (see below).
        !            25: 
        !            26: $   Match end of line.
        !            27: 
        !            28: *   Match zero or more repetitions of preceding character.
        !            29: 
        !            30: .   Match any character except newline.
        !            31: 
        !            32: [_c_h_a_r_s]
        !            33:     Match any  one of the  enclosed chars.  Ranges  of letters or
        !            34:     digits may be indicated using `-'.
        !            35: 
        !            36: [^_c_h_a_r_s]
        !            37:     Match any character except one of the enclosed chars.  Ranges
        !            38:     of letters or digits may be indicated using `-'.
        !            39: 
        !            40: \_c  Disregard special meaning of character c.
        !            41: 
        !            42: ***** Metacharacters *****
        !            43: 
        !            44: In addition,  egrep accepts the  following additional metacharac-
        !            45: ters:
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        !            47: |   Match  the preceding pattern  or the following  pattern.  For
        !            48:     example, the  pattern cat|dog matches  either cat or  dog.  A
        !            49:     newline within the pattern has the same meaning as `|'.
        !            50: 
        !            51: +   Match  one or more  occurrences of the  immediately preceding
        !            52:     pattern  element; it  works like  `*',  except it  matches at
        !            53:     least one occurrence instead of zero or more occurrences.
        !            54: 
        !            55: ?   Match zero or one  occurrence of the preceding element of the
        !            56:     pattern.
        !            57: 
        !            58: (...)
        !            59:     Parentheses  may be  used  to group  patterns.  For  example,
        !            60:     (Ivan)+ matches a sequence  of one or more occurrences of the
        !            61:     four letters `I' `v' `a' or `n'.
        !            62: 
        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            68: 
        !            69: egrep                        Command                        egrep
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        !            73: 
        !            74: Because the metacharacters `*', `?', `$', `(', `)', `[', `]', and
        !            75: `|'   are also  special to  the shell  sshh, patterns  that contain
        !            76: those  literal characters  must  be quoted  by enclosing  pattern
        !            77: within single quotation marks.
        !            78: 
        !            79: ***** Options *****
        !            80: 
        !            81: The following lists the available options:
        !            82: 
        !            83: -bb  With  each output line,  print the block number  in which the
        !            84:     line started (used to search file systems).
        !            85: 
        !            86: -cc  Print how many lines match, rather than the lines themselves.
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        !            88: -ee  The  next argument is  pattern (useful if  the pattern starts
        !            89:     with `-').
        !            90: 
        !            91: -ff  The next argument is a  file that contains a list of patterns
        !            92:     separated by newlines; there is no pattern argument.
        !            93: 
        !            94: -hh  When more than one  file is specified, output lines are norm-
        !            95:     ally accompanied by the file name; -h suppresses this.
        !            96: 
        !            97: -ll  Print the name of  each file that contains the string, rather
        !            98:     than the lines themselves.   This is useful when you are con-
        !            99:     structing a batch file.
        !           100: 
        !           101: -nn   When a  line is  printed, also print  its number  within the
        !           102:     file.
        !           103: 
        !           104: -ss  Suppress all output, just return exit status.
        !           105: 
        !           106: -vv  Print a line only if the pattern is not found in the line.
        !           107: 
        !           108: -yy  Lower-case letters in the pattern match lower-case and upper-
        !           109:     case letters  on the input lines.  A  letter escaped with `\'
        !           110:     in the pattern must be matched in exactly that case.
        !           111: 
        !           112: ***** See Also *****
        !           113: 
        !           114: awk, commands, ed, expr, grep, lex, sed
        !           115: 
        !           116: ***** Diagnostics *****
        !           117: 
        !           118: egrep  returns an  exit status  of zero for  success, one  for no
        !           119: matches, and two for error.
        !           120: 
        !           121: ***** Notes *****
        !           122: 
        !           123: Besides the  difference in the  range of patterns  allowed, egrep
        !           124: uses a  deterministic finite automaton (DFA)  for the search.  It
        !           125: builds the  DFA dynamically, so  it begins doing  useful work im-
        !           126: mediately.  This  means that egrep  is is much  faster than grep,
        !           127: often by  more than an  order of magnitude,  and is  considerably
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        !           129: 
        !           130: COHERENT Lexicon                                           Page 2
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        !           134: 
        !           135: egrep                        Command                        egrep
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        !           137: 
        !           138: 
        !           139: faster  than earlier  pattern-searching commands,  on  almost any
        !           140: length of file.
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        !           196: COHERENT Lexicon                                           Page 3
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