STDLIB
Reference Manual
Version 3.12.1.2
User's Guide
Reference Manual
Release Notes
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Table of Contents
STDLIB (App)
array
Top of manual page
default/1
fix/1
foldl/3
foldr/3
from_list/1
from_list/2
from_orddict/1
from_orddict/2
get/2
is_array/1
is_fix/1
map/2
new/0
new/1
new/2
relax/1
reset/2
resize/1
resize/2
set/3
size/1
sparse_foldl/3
sparse_foldr/3
sparse_map/2
sparse_size/1
sparse_to_list/1
sparse_to_orddict/1
to_list/1
to_orddict/1
assert.hrl
base64
Top of manual page
decode/1
decode_to_string/1
encode/1
encode_to_string/1
mime_decode/1
mime_decode_to_string/1
beam_lib
Top of manual page
all_chunks/1
build_module/1
chunks/2
chunks/3
clear_crypto_key_fun/0
cmp/2
cmp_dirs/2
crypto_key_fun/1
diff_dirs/2
format_error/1
info/1
md5/1
strip/1
strip/2
strip_files/1
strip_files/2
strip_release/1
strip_release/2
version/1
binary
Top of manual page
at/2
bin_to_list/1
bin_to_list/2
bin_to_list/3
compile_pattern/1
copy/1
copy/2
decode_unsigned/1
decode_unsigned/2
encode_unsigned/1
encode_unsigned/2
first/1
last/1
list_to_bin/1
longest_common_prefix/1
longest_common_suffix/1
match/2
match/3
matches/2
matches/3
part/2
part/3
referenced_byte_size/1
replace/3
replace/4
split/2
split/3
c
Top of manual page
bt/1
c/1
c/2
c/3
cd/1
erlangrc/1
flush/0
help/0
i/0
i/3
l/1
lc/1
lm/0
ls/0
ls/1
m/0
m/1
memory/0
memory/1
mm/0
nc/1
nc/2
ni/0
nl/1
nregs/0
pid/3
pwd/0
q/0
regs/0
uptime/0
xm/1
y/1
y/2
calendar
Top of manual page
date_to_gregorian_days/1
date_to_gregorian_days/3
datetime_to_gregorian_seconds/1
day_of_the_week/1
day_of_the_week/3
gregorian_days_to_date/1
gregorian_seconds_to_datetime/1
is_leap_year/1
iso_week_number/0
iso_week_number/1
last_day_of_the_month/2
local_time/0
local_time_to_universal_time/1
local_time_to_universal_time_dst/1
now_to_datetime/1
now_to_local_time/1
now_to_universal_time/1
rfc3339_to_system_time/1
rfc3339_to_system_time/2
seconds_to_daystime/1
seconds_to_time/1
system_time_to_local_time/2
system_time_to_rfc3339/1
system_time_to_rfc3339/2
system_time_to_universal_time/2
time_difference/2
time_to_seconds/1
universal_time/0
universal_time_to_local_time/1
valid_date/1
valid_date/3
dets
Top of manual page
all/0
bchunk/2
close/1
delete/2
delete_all_objects/1
delete_object/2
first/1
foldl/3
foldr/3
from_ets/2
info/1
info/2
init_table/2
init_table/3
insert/2
insert_new/2
is_compatible_bchunk_format/2
is_dets_file/1
lookup/2
match/1
match/2
match/3
match_delete/2
match_object/1
match_object/2
match_object/3
member/2
next/2
open_file/1
open_file/2
pid2name/1
repair_continuation/2
safe_fixtable/2
select/1
select/2
select/3
select_delete/2
slot/2
sync/1
table/1
table/2
to_ets/2
traverse/2
update_counter/3
dict
Top of manual page
append/3
append_list/3
erase/2
fetch/2
fetch_keys/1
filter/2
find/2
fold/3
from_list/1
is_empty/1
is_key/2
map/2
merge/3
new/0
size/1
store/3
take/2
to_list/1
update/3
update/4
update_counter/3
digraph
Top of manual page
add_edge/3
add_edge/4
add_edge/5
add_vertex/1
add_vertex/2
add_vertex/3
del_edge/2
del_edges/2
del_path/3
del_vertex/2
del_vertices/2
delete/1
edge/2
edges/1
edges/2
get_cycle/2
get_path/3
get_short_cycle/2
get_short_path/3
in_degree/2
in_edges/2
in_neighbours/2
info/1
new/0
new/1
no_edges/1
no_vertices/1
out_degree/2
out_edges/2
out_neighbours/2
vertex/2
vertices/1
digraph_utils
Top of manual page
arborescence_root/1
components/1
condensation/1
cyclic_strong_components/1
is_acyclic/1
is_arborescence/1
is_tree/1
loop_vertices/1
postorder/1
preorder/1
reachable/2
reachable_neighbours/2
reaching/2
reaching_neighbours/2
strong_components/1
subgraph/2
subgraph/3
topsort/1
epp
Top of manual page
close/1
default_encoding/0
encoding_to_string/1
format_error/1
open/1
open/2
open/3
parse_erl_form/1
parse_file/2
parse_file/3
read_encoding/1
read_encoding/2
read_encoding_from_binary/1
read_encoding_from_binary/2
set_encoding/1
set_encoding/2
erl_anno
Top of manual page
column/1
end_location/1
file/1
from_term/1
generated/1
is_anno/1
line/1
location/1
new/1
set_file/2
set_generated/2
set_line/2
set_location/2
set_record/2
set_text/2
text/1
to_term/1
erl_eval
Top of manual page
add_binding/3
binding/2
bindings/1
del_binding/2
expr/2
expr/3
expr/4
expr/5
expr_list/2
expr_list/3
expr_list/4
exprs/2
exprs/3
exprs/4
new_bindings/0
erl_expand_records
Top of manual page
module/2
erl_id_trans
Top of manual page
parse_transform/2
erl_internal
Top of manual page
add_predefined_functions/1
arith_op/2
bif/2
bool_op/2
comp_op/2
guard_bif/2
list_op/2
op_type/2
send_op/2
type_test/2
erl_lint
Top of manual page
format_error/1
is_guard_test/1
module/1
module/2
module/3
erl_parse
Top of manual page
abstract/1
abstract/2
anno_from_term/1
anno_to_term/1
fold_anno/3
format_error/1
map_anno/2
mapfold_anno/3
new_anno/1
normalise/1
parse_exprs/1
parse_form/1
parse_term/1
tokens/1
tokens/2
erl_pp
Top of manual page
attribute/1
attribute/2
expr/1
expr/2
expr/3
expr/4
exprs/1
exprs/2
exprs/3
form/1
form/2
function/1
function/2
guard/1
guard/2
erl_scan
Top of manual page
category/1
column/1
end_location/1
format_error/1
line/1
location/1
reserved_word/1
string/1
string/2
string/3
symbol/1
text/1
tokens/3
tokens/4
erl_tar
Top of manual page
add/3
add/4
close/1
create/2
create/3
extract/1
extract/2
format_error/1
init/3
open/2
t/1
table/1
table/2
tt/1
ets
Top of manual page
all/0
delete/1
delete/2
delete_all_objects/1
delete_object/2
file2tab/1
file2tab/2
first/1
foldl/3
foldr/3
from_dets/2
fun2ms/1
give_away/3
i/0
i/1
info/1
info/2
init_table/2
insert/2
insert_new/2
is_compiled_ms/1
last/1
lookup/2
lookup_element/3
match/1
match/2
match/3
match_delete/2
match_object/1
match_object/2
match_object/3
match_spec_compile/1
match_spec_run/2
member/2
new/2
next/2
prev/2
rename/2
repair_continuation/2
safe_fixtable/2
select/1
select/2
select/3
select_count/2
select_delete/2
select_replace/2
select_reverse/1
select_reverse/2
select_reverse/3
setopts/2
slot/2
tab2file/2
tab2file/3
tab2list/1
tabfile_info/1
table/1
table/2
take/2
test_ms/2
to_dets/2
update_counter/3
update_counter/4
update_element/3
whereis/1
file_sorter
Top of manual page
check/1
check/2
keycheck/2
keycheck/3
keymerge/3
keymerge/4
keysort/2
keysort/3
keysort/4
merge/2
merge/3
sort/1
sort/2
sort/3
filelib
Top of manual page
ensure_dir/1
file_size/1
find_file/2
find_file/3
find_source/1
find_source/2
find_source/3
fold_files/5
is_dir/1
is_file/1
is_regular/1
last_modified/1
wildcard/1
wildcard/2
filename
Top of manual page
absname/1
absname/2
absname_join/2
basedir/2
basedir/3
basename/1
basename/2
dirname/1
extension/1
find_src/1
find_src/2
flatten/1
join/1
join/2
nativename/1
pathtype/1
rootname/1
rootname/2
safe_relative_path/1
split/1
gb_sets
Top of manual page
add/2
add_element/2
balance/1
del_element/2
delete/2
delete_any/2
difference/2
empty/0
filter/2
fold/3
from_list/1
from_ordset/1
insert/2
intersection/1
intersection/2
is_disjoint/2
is_element/2
is_empty/1
is_member/2
is_set/1
is_subset/2
iterator/1
iterator_from/2
largest/1
new/0
next/1
singleton/1
size/1
smallest/1
subtract/2
take_largest/1
take_smallest/1
to_list/1
union/1
union/2
gb_trees
Top of manual page
balance/1
delete/2
delete_any/2
empty/0
enter/3
from_orddict/1
get/2
insert/3
is_defined/2
is_empty/1
iterator/1
iterator_from/2
keys/1
largest/1
lookup/2
map/2
next/1
size/1
smallest/1
take/2
take_any/2
take_largest/1
take_smallest/1
to_list/1
update/3
values/1
gen_event
Top of manual page
add_handler/3
add_sup_handler/3
call/3
call/4
delete_handler/3
notify/2
start/0
start/1
start/2
start_link/0
start_link/1
start_link/2
stop/1
stop/3
swap_handler/3
swap_sup_handler/3
sync_notify/2
which_handlers/1
Module:code_change/3
Module:format_status/2
Module:handle_call/2
Module:handle_event/2
Module:handle_info/2
Module:init/1
Module:terminate/2
gen_fsm
gen_server
Top of manual page
abcast/2
abcast/3
call/2
call/3
cast/2
enter_loop/3
enter_loop/4
enter_loop/4
enter_loop/5
multi_call/2
multi_call/3
multi_call/4
reply/2
start/3
start/4
start_link/3
start_link/4
stop/1
stop/3
Module:code_change/3
Module:format_status/2
Module:handle_call/3
Module:handle_cast/2
Module:handle_continue/2
Module:handle_info/2
Module:init/1
Module:terminate/2
gen_statem
Top of manual page
call/2
call/3
cast/2
enter_loop/4
enter_loop/5
enter_loop/6
reply/1
reply/2
start/3
start/4
start_link/3
start_link/4
stop/1
stop/3
Module:StateName/3
Module:StateName/3
Module:callback_mode/0
Module:code_change/4
Module:format_status/2
Module:handle_event/4
Module:handle_event/4
Module:init/1
Module:terminate/3
io
Top of manual page
columns/0
columns/1
format/1
format/2
format/3
fread/2
fread/3
fwrite/1
fwrite/2
fwrite/3
get_chars/2
get_chars/3
get_line/1
get_line/2
getopts/0
getopts/1
nl/0
nl/1
parse_erl_exprs/1
parse_erl_exprs/2
parse_erl_exprs/3
parse_erl_exprs/4
parse_erl_form/1
parse_erl_form/2
parse_erl_form/3
parse_erl_form/4
printable_range/0
put_chars/1
put_chars/2
read/1
read/2
read/3
read/4
rows/0
rows/1
scan_erl_exprs/1
scan_erl_exprs/2
scan_erl_exprs/3
scan_erl_exprs/4
scan_erl_form/1
scan_erl_form/2
scan_erl_form/3
scan_erl_form/4
setopts/1
setopts/2
write/1
write/2
io_lib
Top of manual page
build_text/1
char_list/1
deep_char_list/1
deep_latin1_char_list/1
format/2
format/3
fread/2
fread/3
fwrite/2
fwrite/3
indentation/2
latin1_char_list/1
nl/0
print/1
print/4
printable_latin1_list/1
printable_list/1
printable_unicode_list/1
scan_format/2
unscan_format/1
write/1
write/2
write_atom/1
write_atom_as_latin1/1
write_char/1
write_char_as_latin1/1
write_latin1_char/1
write_latin1_string/1
write_string/1
write_string_as_latin1/1
lists
Top of manual page
all/2
any/2
append/1
append/2
concat/1
delete/2
droplast/1
dropwhile/2
duplicate/2
filter/2
filtermap/2
flatlength/1
flatmap/2
flatten/1
flatten/2
foldl/3
foldr/3
foreach/2
join/2
keydelete/3
keyfind/3
keymap/3
keymember/3
keymerge/3
keyreplace/4
keysearch/3
keysort/2
keystore/4
keytake/3
last/1
map/2
mapfoldl/3
mapfoldr/3
max/1
member/2
merge/1
merge/2
merge/3
merge3/3
min/1
nth/2
nthtail/2
partition/2
prefix/2
reverse/1
reverse/2
search/2
seq/2
seq/3
sort/1
sort/2
split/2
splitwith/2
sublist/2
sublist/3
subtract/2
suffix/2
sum/1
takewhile/2
ukeymerge/3
ukeysort/2
umerge/1
umerge/2
umerge/3
umerge3/3
unzip/1
unzip3/1
usort/1
usort/2
zip/2
zip3/3
zipwith/3
zipwith3/4
log_mf_h
Top of manual page
init/3
init/4
maps
Top of manual page
filter/2
find/2
fold/3
from_list/1
get/2
get/3
is_key/2
iterator/1
keys/1
map/2
merge/2
new/0
next/1
put/3
remove/2
size/1
take/2
to_list/1
update/3
update_with/3
update_with/4
values/1
with/2
without/2
math
Top of manual page
acos/1
acosh/1
asin/1
asinh/1
atan/1
atan2/2
atanh/1
ceil/1
cos/1
cosh/1
erf/1
erfc/1
exp/1
floor/1
fmod/2
log/1
log10/1
log2/1
pi/0
pow/2
sin/1
sinh/1
sqrt/1
tan/1
tanh/1
ms_transform
Top of manual page
format_error/1
parse_transform/2
transform_from_shell/3
orddict
Top of manual page
append/3
append_list/3
erase/2
fetch/2
fetch_keys/1
filter/2
find/2
fold/3
from_list/1
is_empty/1
is_key/2
map/2
merge/3
new/0
size/1
store/3
take/2
to_list/1
update/3
update/4
update_counter/3
ordsets
Top of manual page
add_element/2
del_element/2
filter/2
fold/3
from_list/1
intersection/1
intersection/2
is_disjoint/2
is_element/2
is_empty/1
is_set/1
is_subset/2
new/0
size/1
subtract/2
to_list/1
union/1
union/2
pool
Top of manual page
attach/1
get_node/0
get_nodes/0
pspawn/3
pspawn_link/3
start/1
start/2
stop/0
proc_lib
Top of manual page
format/1
format/2
format/3
hibernate/3
init_ack/1
init_ack/2
initial_call/1
spawn/1
spawn/2
spawn/3
spawn/4
spawn_link/1
spawn_link/2
spawn_link/3
spawn_link/4
spawn_opt/2
spawn_opt/3
spawn_opt/4
spawn_opt/5
start/3
start/4
start/5
start_link/3
start_link/4
start_link/5
stop/1
stop/3
translate_initial_call/1
proplists
Top of manual page
append_values/2
compact/1
delete/2
expand/2
get_all_values/2
get_bool/2
get_keys/1
get_value/2
get_value/3
is_defined/2
lookup/2
lookup_all/2
normalize/2
property/1
property/2
split/2
substitute_aliases/2
substitute_negations/2
unfold/1
qlc
Top of manual page
append/1
append/2
cursor/1
cursor/2
delete_cursor/1
e/1
e/2
eval/1
eval/2
fold/3
fold/4
format_error/1
info/1
info/2
keysort/2
keysort/3
next_answers/1
next_answers/2
q/1
q/2
sort/1
sort/2
string_to_handle/1
string_to_handle/2
string_to_handle/3
table/2
queue
Top of manual page
cons/2
daeh/1
drop/1
drop_r/1
filter/2
from_list/1
get/1
get_r/1
head/1
in/2
in_r/2
init/1
is_empty/1
is_queue/1
join/2
lait/1
last/1
len/1
liat/1
member/2
new/0
out/1
out_r/1
peek/1
peek_r/1
reverse/1
snoc/2
split/2
tail/1
to_list/1
rand
Top of manual page
export_seed/0
export_seed_s/1
jump/0
jump/1
normal/0
normal/2
normal_s/1
normal_s/3
seed/1
seed/2
seed_s/1
seed_s/2
uniform/0
uniform/1
uniform_real/0
uniform_real_s/1
uniform_s/1
uniform_s/2
random
Top of manual page
seed/0
seed/1
seed/3
seed0/0
uniform/0
uniform/1
uniform_s/1
uniform_s/2
re
Top of manual page
compile/1
compile/2
inspect/2
replace/3
replace/4
run/2
run/3
split/2
split/3
version/0
sets
Top of manual page
add_element/2
del_element/2
filter/2
fold/3
from_list/1
intersection/1
intersection/2
is_disjoint/2
is_element/2
is_empty/1
is_set/1
is_subset/2
new/0
size/1
subtract/2
to_list/1
union/1
union/2
shell
Top of manual page
catch_exception/1
history/1
prompt_func/1
results/1
start_restricted/1
stop_restricted/0
strings/1
shell_default
slave
Top of manual page
pseudo/1
pseudo/2
relay/1
start/1
start/2
start/3
start_link/1
start_link/2
start_link/3
stop/1
sofs
Top of manual page
a_function/1
a_function/2
canonical_relation/1
composite/2
constant_function/2
converse/1
difference/2
digraph_to_family/1
digraph_to_family/2
domain/1
drestriction/2
drestriction/3
empty_set/0
extension/3
family/1
family/2
family_difference/2
family_domain/1
family_field/1
family_intersection/1
family_intersection/2
family_projection/2
family_range/1
family_specification/2
family_to_digraph/1
family_to_digraph/2
family_to_relation/1
family_union/1
family_union/2
field/1
from_external/2
from_sets/1
from_term/1
from_term/2
image/2
intersection/1
intersection/2
intersection_of_family/1
inverse/1
inverse_image/2
is_a_function/1
is_disjoint/2
is_empty_set/1
is_equal/2
is_set/1
is_sofs_set/1
is_subset/2
is_type/1
join/4
multiple_relative_product/2
no_elements/1
partition/1
partition/2
partition/3
partition_family/2
product/1
product/2
projection/2
range/1
relation/1
relation/2
relation_to_family/1
relative_product/1
relative_product/2
relative_product1/2
restriction/2
restriction/3
set/1
set/2
specification/2
strict_relation/1
substitution/2
symdiff/2
symmetric_partition/2
to_external/1
to_sets/1
type/1
union/1
union/2
union_of_family/1
weak_relation/1
string
Top of manual page
casefold/1
centre/2
centre/3
chars/2
chars/3
chomp/1
chr/2
concat/2
copies/2
cspan/2
equal/2
equal/3
equal/4
find/2
find/3
is_empty/1
join/2
left/2
left/3
len/1
length/1
lexemes/2
lowercase/1
next_codepoint/1
next_grapheme/1
nth_lexeme/3
pad/2
pad/3
pad/4
prefix/2
rchr/2
replace/3
replace/4
reverse/1
right/2
right/3
rstr/2
slice/2
slice/3
span/2
split/2
split/3
str/2
strip/1
strip/2
strip/3
sub_string/2
sub_string/3
sub_word/2
sub_word/3
substr/2
substr/3
take/2
take/3
take/4
titlecase/1
to_float/1
to_graphemes/1
to_integer/1
to_lower/1
to_upper/1
tokens/2
trim/1
trim/2
trim/3
uppercase/1
words/1
words/2
supervisor
Top of manual page
check_childspecs/1
count_children/1
delete_child/2
get_childspec/2
restart_child/2
start_child/2
start_link/2
start_link/3
terminate_child/2
which_children/1
Module:init/1
supervisor_bridge
Top of manual page
start_link/2
start_link/3
Module:init/1
Module:terminate/2
sys
Top of manual page
change_code/4
change_code/5
debug_options/1
get_debug/3
get_log/1
get_state/1
get_state/2
get_status/1
get_status/2
handle_debug/4
handle_system_msg/6
install/2
install/3
log/2
log/3
log_to_file/2
log_to_file/3
no_debug/1
no_debug/2
print_log/1
remove/2
remove/3
replace_state/2
replace_state/3
resume/1
resume/2
statistics/2
statistics/3
suspend/1
suspend/2
terminate/2
terminate/3
trace/2
trace/3
Module:system_code_change/4
Module:system_continue/3
Module:system_get_state/1
Module:system_replace_state/2
Module:system_terminate/4
timer
Top of manual page
apply_after/4
apply_interval/4
cancel/1
exit_after/2
exit_after/3
hms/3
hours/1
kill_after/1
kill_after/2
minutes/1
now_diff/2
seconds/1
send_after/2
send_after/3
send_interval/2
send_interval/3
sleep/1
start/0
tc/1
tc/2
tc/3
unicode
Top of manual page
bom_to_encoding/1
characters_to_binary/1
characters_to_binary/2
characters_to_binary/3
characters_to_list/1
characters_to_list/2
characters_to_nfc_binary/1
characters_to_nfc_list/1
characters_to_nfd_binary/1
characters_to_nfd_list/1
characters_to_nfkc_binary/1
characters_to_nfkc_list/1
characters_to_nfkd_binary/1
characters_to_nfkd_list/1
encoding_to_bom/1
uri_string
Top of manual page
compose_query/1
compose_query/2
dissect_query/1
normalize/1
normalize/2
parse/1
recompose/1
resolve/2
resolve/3
transcode/2
win32reg
Top of manual page
change_key/2
change_key_create/2
close/1
current_key/1
delete_key/1
delete_value/2
expand/1
format_error/1
open/1
set_value/3
sub_keys/1
value/2
values/1
zip
Top of manual page
create/2
create/3
extract/1
extract/2
foldl/3
list_dir/1
list_dir/2
t/1
table/1
table/2
tt/1
unzip/1
unzip/2
zip/2
zip/3
zip_close/1
zip_get/1
zip_get/2
zip_list_dir/1
zip_open/1
zip_open/2
STDLIB Reference Manual
Version 3.12.1.2
March 18, 2024