Provided by: erlang-manpages_25.2.3+dfsg-1_all 
NAME
c - Command interface module.
DESCRIPTION
This module enables users to enter the short form of some commonly used commands.
Note:
These functions are intended for interactive use in the Erlang shell only. The module
prefix can be omitted.
EXPORTS
bt(Pid) -> ok | undefined
Types:
Pid = pid()
Stack backtrace for a process. Equivalent to erlang:process_display(Pid,
backtrace).
c(Module) -> {ok, ModuleName} | error
Types:
Module = file:name()
ModuleName = module()
Works like c(Module, []).
c(Module, Options) -> {ok, ModuleName} | error
Types:
Module = file:name()
Options = [compile:option()] | compile:option()
ModuleName = module()
Compiles and then purges and loads the code for a module. Module can be either a
module name or a source file path, with or without .erl extension.
If Module is a string, it is assumed to be a source file path, and the compiler
will attempt to compile the source file with the options Options. If compilation
fails, the old object file (if any) is deleted.
If Module is an atom, a source file with that exact name or with .erl extension
will be looked for. If found, the source file is compiled with the options Options.
If compilation fails, the old object file (if any) is deleted.
If Module is an atom and is not the path of a source file, then the code path is
searched to locate the object file for the module and extract its original compiler
options and source path. If the source file is not found in the original location,
filelib:find_source/1 is used to search for it relative to the directory of the
object file.
The source file is compiled with the the original options appended to the given
Options, the output replacing the old object file if and only if compilation
succeeds.
Notice that purging the code means that any processes lingering in old code for the
module are killed without warning. For more information, see the code module.
c(Module, Options, Filter) -> {ok, ModuleName} | error
Types:
Module = atom()
Options = [compile:option()]
Filter = fun((compile:option()) -> boolean())
ModuleName = module()
Compiles and then purges and loads the code for module Module, which must be an
atom.
The code path is searched to locate the object file for module Module and extract
its original compiler options and source path. If the source file is not found in
the original location, filelib:find_source/1 is used to search for it relative to
the directory of the object file.
The source file is compiled with the the original options appended to the given
Options, the output replacing the old object file if and only if compilation
succeeds. The function Filter specifies which elements to remove from the original
compiler options before the new options are added. The Filter fun should return
true for options to keep, and false for options to remove.
Notice that purging the code means that any processes lingering in old code for the
module are killed without warning. For more information, see the code module.
cd(Dir) -> ok
Types:
Dir = file:name()
Changes working directory to Dir, which can be a relative name, and then prints the
name of the new working directory.
Example:
2> cd("../erlang").
/home/ron/erlang
erlangrc(PathList) -> {ok, file:filename()} | {error, term()}
Types:
PathList = [Dir :: file:name()]
Search PathList and load .erlang resource file if found.
flush() -> ok
Flushes any messages sent to the shell.
help() -> ok
Displays help information: all valid shell internal commands, and commands in this
module.
h(Module :: module()) -> h_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
Print the documentation for Module
h(Module :: module(), Function :: function()) -> hf_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
hf_return() = h_return() | {error, function_missing}
Print the documentation for all Module:Functions (regardless of arity).
h(Module :: module(), Function :: function(), Arity :: arity()) ->
hf_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
hf_return() = h_return() | {error, function_missing}
Print the documentation for Module:Function/Arity.
hcb(Module :: module()) -> h_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
Print the callback documentation for Module
hcb(Module :: module(), Callback :: atom()) -> hcb_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
hcb_return() = h_return() | {error, callback_missing}
Print the callback documentation for all Module:Callbacks (regardless of arity).
hcb(Module :: module(), Callback :: atom(), Arity :: arity()) ->
hcb_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
hcb_return() = h_return() | {error, callback_missing}
Print the callback documentation for Module:Callback/Arity.
ht(Module :: module()) -> h_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
Print the type documentation for Module
ht(Module :: module(), Type :: atom()) -> ht_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
ht_return() = h_return() | {error, type_missing}
Print the type documentation for Type in Module regardless of arity.
ht(Module :: module(), Type :: atom(), Arity :: arity()) ->
ht_return()
Types:
h_return() =
ok | {error, missing | {unknown_format, unicode:chardata()}}
ht_return() = h_return() | {error, type_missing}
Print the type documentation for Type/Arity in Module.
i() -> ok
ni() -> ok
i/0 displays system information, listing information about all processes. ni/0 does
the same, but for all nodes the network.
i(X, Y, Z) -> [{atom(), term()}]
Types:
X = Y = Z = integer() >= 0
Displays information about a process, Equivalent to process_info(pid(X, Y, Z)), but
location transparent.
l(Module) -> code:load_ret()
Types:
Module = module()
Purges and loads, or reloads, a module by calling code:purge(Module) followed by
code:load_file(Module).
Notice that purging the code means that any processes lingering in old code for the
module are killed without warning. For more information, see code/3.
lc(Files) -> ok
Types:
Files = [File]
File
Compiles a list of files by calling compile:file(File, [report_errors,
report_warnings]) for each File in Files.
For information about File, see file:filename().
lm() -> [code:load_ret()]
Reloads all currently loaded modules that have changed on disk (see mm()). Returns
the list of results from calling l(M) for each such M.
ls() -> ok
Lists files in the current directory.
ls(Dir) -> ok
Types:
Dir = file:name()
Lists files in directory Dir or, if Dir is a file, only lists it.
m() -> ok
Displays information about the loaded modules, including the files from which they
have been loaded.
m(Module) -> ok
Types:
Module = module()
Displays information about Module.
mm() -> [module()]
Lists all modified modules. Shorthand for code:modified_modules/0.
memory() -> [{Type, Size}]
Types:
Type = atom()
Size = integer() >= 0
Memory allocation information. Equivalent to erlang:memory/0.
memory(Type) -> Size
memory(Types) -> [{Type, Size}]
Types:
Types = [Type]
Type = atom()
Size = integer() >= 0
Memory allocation information. Equivalent to erlang:memory/1.
nc(File) -> {ok, Module} | error
nc(File, Options) -> {ok, Module} | error
Types:
File = file:name()
Options = [Option] | Option
Option = compile:option()
Module = module()
Compiles and then loads the code for a file on all nodes. Options defaults to [].
Compilation is equivalent to:
compile:file(File, Options ++ [report_errors, report_warnings])
nl(Module) -> abcast | error
Types:
Module = module()
Loads Module on all nodes.
pid(X, Y, Z) -> pid()
Types:
X = Y = Z = integer() >= 0
Converts X, Y, Z to pid <X.Y.Z>. This function is only to be used when debugging.
pwd() -> ok
Prints the name of the working directory.
q() -> no_return()
This function is shorthand for init:stop(), that is, it causes the node to stop in
a controlled fashion.
regs() -> ok
nregs() -> ok
regs/0 displays information about all registered processes. nregs/0 does the same,
but for all nodes in the network.
uptime() -> ok
Prints the node uptime (as specified by erlang:statistics(wall_clock)) in human-
readable form.
xm(ModSpec) -> void()
Types:
ModSpec = Module | Filename
Module = atom()
Filename = string()
Finds undefined functions, unused functions, and calls to deprecated functions in a
module by calling xref:m/1.
y(File) -> YeccRet
Types:
File = name()
YeccRet
Generates an LALR-1 parser. Equivalent to:
yecc:file(File)
For information about File = name(), see filename(3erl). For information about
YeccRet, see yecc:file/2.
y(File, Options) -> YeccRet
Types:
File = name()
Options, YeccRet
Generates an LALR-1 parser. Equivalent to:
yecc:file(File, Options)
For information about File = name(), see filename(3erl). For information about
Options and YeccRet, see yecc:file/2.
SEE ALSO
filename(3erl), compile(3erl), erlang(3erl), yecc(3erl), xref(3erl)