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m4 - macro processor


m4 [OPTION]... [FILE]...


Process macros in FILEs. If no FILE or if FILE is `-', standard input is read.

Mandatory or optional arguments to long options are mandatory or optional for short
options too.

Operation modes:
--help display this help and exit

output version information and exit

-E, --fatal-warnings
once: warnings become errors, twice: stop execution at first error

-i, --interactive
unbuffer output, ignore interrupts

-P, --prefix-builtins
force a `m4_' prefix to all builtins

-Q, --quiet, --silent
suppress some warnings for builtins

warn if macro definition matches REGEXP,

default \$\({[^}]*}\|[0-9][0-9]+\)

Preprocessor features:
-D, --define=NAME[=VALUE]
define NAME as having VALUE, or empty

-I, --include=DIRECTORY
append DIRECTORY to include path

-s, --synclines
generate `#line NUM "FILE"' lines

-U, --undefine=NAME
undefine NAME

Limits control:
-g, --gnu
override -G to re-enable GNU extensions

-G, --traditional
suppress all GNU extensions

-H, --hashsize=PRIME
set symbol lookup hash table size [509]

-L, --nesting-limit=NUMBER
change nesting limit, 0 for unlimited [0]

Frozen state files:
-F, --freeze-state=FILE
produce a frozen state on FILE at end

-R, --reload-state=FILE
reload a frozen state from FILE at start

-d, --debug[=FLAGS]
set debug level (no FLAGS implies `aeq')

redirect debug and trace output to FILE (default stderr, discard if empty string)

-l, --arglength=NUM
restrict macro tracing size

-t, --trace=NAME
trace NAME when it is defined

FLAGS is any of:
a show actual arguments

c show before collect, after collect and after call

e show expansion

f say current input file name

i show changes in input files

l say current input line number

p show results of path searches

q quote values as necessary, with a or e flag

t trace for all macro calls, not only traceon'ed

x add a unique macro call id, useful with c flag

V shorthand for all of the above flags

If defined, the environment variable `M4PATH' is a colon-separated list of directories
included after any specified by `-I'.

Exit status is 0 for success, 1 for failure, 63 for frozen file version mismatch, or
whatever value was passed to the m4exit macro.

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