Linux cli command lex

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command lex and provides detailed information about the command lex, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the lex.

  3 minute read  

NAME 🖥️ lex 🖥️

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

–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

–backup-file=FILE
write backing-up information 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

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.

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