packages icon



 FLEX(1)                         flex 2.5.36                         FLEX(1)
 User Commands                                                 User Commands

                                  July 2012



 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



                                    - 1 -           Formatted:  July 6, 2022






 FLEX(1)                         flex 2.5.36                         FLEX(1)
 User Commands                                                 User Commands

                                  July 2012



      -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




                                    - 2 -           Formatted:  July 6, 2022






 FLEX(1)                         flex 2.5.36                         FLEX(1)
 User Commands                                                 User Commands

                                  July 2012



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

      -Dmacro[=defn]
           #define macro defn  (default defn is '1')

      -L,  --noline
           suppress #line directives in scanner

      -P,  --prefix=STRING
           use STRING as prefix instead of "yy"

      -R,  --reentrant
           generate a reentrant C scanner

      --bison-bridge
           scanner for bison pure parser.

      --bison-locations
           include yylloc support.

      --stdinit
           initialize yyin/yyout to stdin/stdout

      --noansi-definitions old-style function definitions

      --noansi-prototypes
           empty parameter list in prototypes

      --nounistd
           do not include <unistd.h>

      --noFUNCTION
           do not generate a particular FUNCTION

    Miscellaneous:
      -c   do-nothing POSIX option

      -n   do-nothing POSIX option

      -?

      -h, --help
           produce this help message

      -V, --version
           report flex version




                                    - 3 -           Formatted:  July 6, 2022






 FLEX(1)                         flex 2.5.36                         FLEX(1)
 User Commands                                                 User Commands

                                  July 2012



 SEE ALSO
      The full documentation for flex is maintained as a Texinfo manual.  If
      the info and flex programs are properly installed at your site, the
      command

           info flex

      should give you access to the complete manual.












































                                    - 4 -           Formatted:  July 6, 2022