.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.1.

.TH FLEX "1" "March 2016" "flex 2.6.1" "User Commands"

.SH NAME

flex \- the fast lexical analyser generator

.SH SYNOPSIS

.B flex

[\fI\,OPTIONS\/\fR] [\fI\,FILE\/\fR]...

.SH DESCRIPTION

Generates programs that perform pattern\-matching on text.

.SS "Table Compression:"

.TP

\fB\-Ca\fR, \fB\-\-align\fR

trade off larger tables for better memory alignment

.TP

\fB\-Ce\fR, \fB\-\-ecs\fR

construct equivalence classes

.TP

\fB\-Cf\fR

do not compress tables; use \fB\-f\fR representation

.TP

\fB\-CF\fR

do not compress tables; use \fB\-F\fR representation

.TP

\fB\-Cm\fR, \fB\-\-meta\-ecs\fR

construct meta\-equivalence classes

.TP

\fB\-Cr\fR, \fB\-\-read\fR

use read() instead of stdio for scanner input

.TP

\fB\-f\fR, \fB\-\-full\fR

generate fast, large scanner. Same as \fB\-Cfr\fR

.TP

\fB\-F\fR, \fB\-\-fast\fR

use alternate table representation. Same as \fB\-CFr\fR

.TP

\fB\-Cem\fR

default compression (same as \fB\-\-ecs\fR \fB\-\-meta\-ecs\fR)

.SS "Debugging:"

.TP

\fB\-d\fR, \fB\-\-debug\fR

enable debug mode in scanner

.TP

\fB\-b\fR, \fB\-\-backup\fR

write backing\-up information to lex.backup

.TP

\fB\-p\fR, \fB\-\-perf\-report\fR

write performance report to stderr

.TP

\fB\-s\fR, \fB\-\-nodefault\fR

suppress default rule to ECHO unmatched text

.TP

\fB\-T\fR, \fB\-\-trace\fR

flex should run in trace mode

.TP

\fB\-w\fR, \fB\-\-nowarn\fR

do not generate warnings

.TP

\fB\-v\fR, \fB\-\-verbose\fR

write summary of scanner statistics to stdout

.TP

\fB\-\-hex\fR

use hexadecimal numbers instead of octal in debug outputs

.SH FILES

.TP

\fB\-o\fR, \fB\-\-outfile\fR=\fI\,FILE\/\fR

specify output filename

.TP

\fB\-S\fR, \fB\-\-skel\fR=\fI\,FILE\/\fR

specify skeleton file

.TP

\fB\-t\fR, \fB\-\-stdout\fR

write scanner on stdout instead of lex.yy.c

.TP

\fB\-\-yyclass\fR=\fI\,NAME\/\fR

name of C++ class

.TP

\fB\-\-header\-file\fR=\fI\,FILE\/\fR

create a C header file in addition to the scanner

.HP

\fB\-\-tables\-file\fR[=\fI\,FILE\/\fR] write tables to FILE

.SS "Scanner behavior:"

.TP

\fB\-7\fR, \fB\-\-7bit\fR

generate 7\-bit scanner

.TP

\fB\-8\fR, \fB\-\-8bit\fR

generate 8\-bit scanner

.TP

\fB\-B\fR, \fB\-\-batch\fR

generate batch scanner (opposite of \fB\-I\fR)

.TP

\fB\-i\fR, \fB\-\-case\-insensitive\fR

ignore case in patterns

.TP

\fB\-l\fR, \fB\-\-lex\-compat\fR

maximal compatibility with original lex

.TP

\fB\-X\fR, \fB\-\-posix\-compat\fR

maximal compatibility with POSIX lex

.TP

\fB\-I\fR, \fB\-\-interactive\fR

generate interactive scanner (opposite of \fB\-B\fR)

.TP

\fB\-\-yylineno\fR

track line count in yylineno

.SS "Generated code:"

.TP

\-+,  \fB\-\-c\fR++

generate C++ scanner class

.TP

\fB\-Dmacro\fR[=\fI\,defn\/\fR]

#define macro defn  (default defn is '1')

.TP

\fB\-L\fR,  \fB\-\-noline\fR

suppress #line directives in scanner

.TP

\fB\-P\fR,  \fB\-\-prefix\fR=\fI\,STRING\/\fR

use STRING as prefix instead of "yy"

.TP

\fB\-R\fR,  \fB\-\-reentrant\fR

generate a reentrant C scanner

.TP

\fB\-\-bison\-bridge\fR

scanner for bison pure parser.

.TP

\fB\-\-bison\-locations\fR

include yylloc support.

.TP

\fB\-\-stdinit\fR

initialize yyin/yyout to stdin/stdout

.HP

\fB\-\-noansi\-definitions\fR old\-style function definitions

.TP

\fB\-\-noansi\-prototypes\fR

empty parameter list in prototypes

.TP

\fB\-\-nounistd\fR

do not include <unistd.h>

.TP

\fB\-\-noFUNCTION\fR

do not generate a particular FUNCTION

.SS "Miscellaneous:"

.TP

\fB\-c\fR

do\-nothing POSIX option

.TP

\fB\-n\fR

do\-nothing POSIX option

.HP

\-?

.TP

\fB\-h\fR, \fB\-\-help\fR

produce this help message

.TP

\fB\-V\fR, \fB\-\-version\fR

report flex version

.SH "SEE ALSO"

The full documentation for

.B flex

is maintained as a Texinfo manual.  If the

.B info

and

.B flex

programs are properly installed at your site, the command

.IP

.B info flex

.PP

should give you access to the complete manual.