View atom_table.erl
count() ->
Info = erlang:system_info(info),
Chunks = binary:split(Info, <<"=">>, [global]),
[TabInfo] = [X || <<"index_table:atom_tab", X/binary>> <- Chunks],
Lines = binary:split(TabInfo, <<"\n">>, [global]),
Chunks2 = [binary:split(L, <<": ">>) || L <- Lines, L =/= <<>>],
View Dockerfile
FROM centos:centos6
RUN yum update -y && yum install -y


Example of OTP deadlock via the application controller.

In OTP, the application environment is handled via a ETS table, which is accessed via the application_controller process. Whilst reading an environment variable is implemented as a mere lookup operation, writes are serialized through the application controller. In other words, it is not possible to set an environment variable from a terminate/1 callback in a gen_server which traps exits,

#!/usr/bin/env bash
# Kill an Erlang process by node name
# e.g.: kill-erlang-node kred
# Check usage
if [ -z "$1" ]; then
echo "Usage: `basename $0` NODE_NAME"
exit 1

Misleading error message on ssh_sftp:start_channel/1 in case user does not have a shell

When starting a SFTP channel towards a system where user does not have a shell (i.e. it has /bin/false or equilvalent assigned in the /etc/passwd a misleading error message is returned to the user:

1> test:go(). 
** exception exit: {normal,{gen_server,call,
View ekill
# Kill an Erlang process by node name
# e.g.: ekill my_node
# Check usage
if [ -z "$1" ]; then
echo "Usage: `basename $0` NODE_NAME"
exit 1

Start an instance of the Erlang run-time system

$ erl

Show information about processes

> i().

Spawn a new process which sleeps for 10 seconds

View unescriptize
tail -n +2 $1 > $1.tmp
unzip -d $1.unescriptized $1.tmp
rm $1.tmp
View this_is_fun.erl
have_fun() ->
table = ets:new(table, [named_table]),
F = fun(X) -> X + 1 end,
ets:insert(table, {function, F}),
register(funny, spawn(?MODULE, loop, [])).
View debugging-notes
(<0.80.0>) call ct_logs:tc_print(info,50,"...")
(<0.80.0>) call ct_util:get_testdata({verbosity,info})
(<0.80.0>) call ct_util:call({get_testdata,{verbosity,info}})
(<0.80.0>) call ct_util:call({get_testdata,{verbosity,info}},infinity)
(<0.80.0>) call erlang:whereis(ct_util_server)