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FLEX(1)                                         User Commands                                        FLEX(1)



NAME
       flex - fast lexical analyzer 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]
              #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

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.



flex 2.5.33                                     February 2006                                        FLEX(1)