/usr/bin/flex

Usage: flex [OPTIONS] [FILE]...
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
      --hex               use hexadecimal numbers instead of octal in debug outputs

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
       --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