read_file filename
write_file [par]
abort_file

# par-> 'uid':def 0, 'gid':def 0, 'mode':def 0644

locate regexp
incr N
reset

append str [str2 ...]
insert str [str2 ...]
replace_all str1 replacewith1 [str2 replacewith2 ...]

eval exp
eval_to regexp exp
eval_n N exp
eval_all exp
eval_where regexp1 exp1 [regexp2 exp2 ...]

delete_all regexp
delete_to regexp
delete_n N
delete_file

exist regexp

comment regexp [comment [commentend]]
comment_to regexp [comment [commentend]]
comment_n N [comment [commentend]]

uncomment regexp [comment [commentend]]
uncomment_to regexp [comment [commentend]]
uncomment_n N [comment [commentend]]

is_XXXX	sunos sunos5 sunos4 freebsd linux debian hp aix
	return: version

append_file filename
add_list prefix \@list [separator,def=: [newline_str]]