man flex Command

Man page for apt-get flex Command

Man Page for flex in Linux

This tutorial shows the man page for man flex in linux.

Open terminal with 'su' access and type the command as shown below:
man flex

Result of the Command Execution shown below:

FLEX(1)                                                                     User Commands                                                                    FLEX(1)



NAME
       flex   the fast lexical analyser generator

SYNOPSIS
       flex [OPTIONS] [FILE]...

DESCRIPTION
       Generates programs that perform pattern matching on text.

   Table Compression:
        Ca,   align
              trade off larger tables for better memory alignment

        Ce,   ecs
              construct equivalence classes

        Cf    do not compress tables; use  f representation

        CF    do not compress tables; use  F representation

        Cm,   meta ecs
              construct meta equivalence classes

        Cr,   read
              use read() instead of stdio for scanner input

        f,   full
              generate fast, large scanner. Same as  Cfr

        F,   fast
              use alternate table representation. Same as  CFr

        Cem   default compression (same as   ecs   meta ecs)

   Debugging:
        d,   debug
              enable debug mode in scanner

        b,   backup
              write backing up information to lex.backup

        p,   perf report
              write performance report to stderr

        s,   nodefault
              suppress default rule to ECHO unmatched text

        T,   trace
              flex should run in trace mode

        w,   nowarn
              do not generate warnings

        v,   verbose
              write summary of scanner statistics to stdout

   Files:
        o,   outfile=FILE
              specify output filename

        S,   skel=FILE
              specify skeleton file

        t,   stdout
              write scanner on stdout instead of lex.yy.c

         yyclass=NAME
              name of C++ class

         header file=FILE
              create a C header file in addition to the scanner

         tables file[=FILE] write tables to FILE

   Scanner behavior:
        7,   7bit
              generate 7 bit scanner

        8,   8bit
              generate 8 bit scanner

        B,   batch
              generate batch scanner (opposite of  I)

        i,   case insensitive
              ignore case in patterns

        l,   lex compat
              maximal compatibility with original lex

        X,   posix compat
              maximal compatibility with POSIX lex

        I,   interactive
              generate interactive scanner (opposite of  B)

         yylineno
              track line count in yylineno

   Generated code:
        +,    c++
              generate C++ scanner class

        Dmacro[=defn]
              

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