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1.1       root        1: .TH LEX 1 "7 February 1983"
                      2: .SH NAME
                      3: lex \- generator of lexical analysis programs
                      4: .SH SYNOPSIS
                      5: .B lex
                      6: [
                      7: .B \-tvfn
                      8: ] [ file ] ...
                      9: .SH DESCRIPTION
                     10: .I Lex
                     11: generates programs to be used in simple lexical analyis of text.
                     12: The input
                     13: .I files
                     14: (standard input default) contain regular expressions
                     15: to be searched for, and actions written in C to be executed when
                     16: expressions are found.
                     17: .PP
                     18: A C source program, 'lex.yy.c' is generated, to be compiled thus:
                     19: .IP
                     20: cc lex.yy.c \-ll
                     21: .LP
                     22: This program, when run, copies unrecognized portions of
                     23: the input to the output, and executes the associated
                     24: C action for each regular expression that is recognized.
                     25: .PP
                     26: The options have the following meanings.
                     27: .TP
                     28: .B \-t
                     29: Place the result on the standard output instead of in file "lex.yy.c".
                     30: .TP
                     31: .B \-v
                     32: Print a one-line summary of statistics of the generated analyzer.
                     33: .TP
                     34: .B \-n
                     35: Opposite of
                     36: .BR \-v ;
                     37: .B \-n
                     38: is default.
                     39: .TP
                     40: .B \-f
                     41: "Faster" compilation: don't bother to pack
                     42: the resulting tables; limited to small programs.
                     43: .SH EXAMPLE
                     44: .IP
                     45: lex lexcommands
                     46: .PP
                     47: would draw
                     48: .I lex
                     49: instructions from the file
                     50: .I lexcommands,
                     51: and place the output in
                     52: .I lex.yy.c
                     53: .IP ""
                     54: .nf
                     55: .ta \w'[A\-Z] 'u
                     56: %%
                     57: [A\-Z] putchar(yytext[0]+\'a\'\-\'A\');
                     58: [ ]+$
                     59: [ ]+   putchar(\' \');
                     60: .fi
                     61: .PP
                     62: is an example of a
                     63: .I lex
                     64: program that would be put into a
                     65: .I lex
                     66: command file.  This program converts upper case to lower,
                     67: removes blanks at the end of lines,
                     68: and replaces multiple blanks by single blanks.
                     69: .SH "SEE ALSO"
                     70: yacc(1), sed(1)
                     71: .br
                     72: M. E. Lesk and E. Schmidt,
                     73: .I LEX \- Lexical Analyzer Generator

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