.TH c 3erl "stdlib 3.2" "Ericsson AB" "Erlang Module Definition"
.SH NAME
c \- Command interface module.
.SH DESCRIPTION
.LP
This module enables users to enter the short form of some commonly used commands\&.
.LP

.RS -4
.B
Note:
.RE
These functions are intended for interactive use in the Erlang shell only\&. The module prefix can be omitted\&.

.SH EXPORTS
.LP
.nf

.B
bt(Pid) -> ok | undefined
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Pid = pid()
.br
.RE
.RE
.RS
.LP
Stack backtrace for a process\&. Equivalent to \fIerlang:process_display(Pid, backtrace)\fR\&\&.
.RE

.LP
.nf

.B
c(File) -> {ok, Module} | error
.br
.fi
.br
.nf

.B
c(File, Options) -> {ok, Module} | error
.br
.fi
.br
.RS
.LP
Types:

.RS 3
File = \fBfile:name()\fR\&
.br
Options = [\fBcompile:option()\fR\&]
.br
Module = module()
.br
.RE
.RE
.RS
.LP
Compiles and then purges and loads the code for a file\&. \fIOptions\fR\& defaults to \fI[]\fR\&\&. Compilation is equivalent to:
.LP
.nf

compile:file(File, Options ++ [report_errors, report_warnings])
.fi
.LP
Notice that purging the code means that any processes lingering in old code for the module are killed without warning\&. For more information, see \fIcode/3\fR\&\&.
.RE

.LP
.nf

.B
cd(Dir) -> ok
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Dir = \fBfile:name()\fR\&
.br
.RE
.RE
.RS
.LP
Changes working directory to \fIDir\fR\&, which can be a relative name, and then prints the name of the new working directory\&.
.LP
\fIExample:\fR\&
.LP
.nf

2> cd("\&.\&./erlang")\&.
/home/ron/erlang
.fi
.RE

.LP
.nf

.B
flush() -> ok
.br
.fi
.br
.RS
.LP
Flushes any messages sent to the shell\&.
.RE

.LP
.nf

.B
help() -> ok
.br
.fi
.br
.RS
.LP
Displays help information: all valid shell internal commands, and commands in this module\&.
.RE

.LP
.nf

.B
i() -> ok
.br
.fi
.br
.nf

.B
ni() -> ok
.br
.fi
.br
.RS
.LP
\fIi/0\fR\& displays system information, listing information about all processes\&. \fIni/0\fR\& does the same, but for all nodes the network\&.
.RE

.LP
.nf

.B
i(X, Y, Z) -> [{atom(), term()}]
.br
.fi
.br
.RS
.LP
Types:

.RS 3
X = Y = Z = integer() >= 0
.br
.RE
.RE
.RS
.LP
Displays information about a process, Equivalent to \fIprocess_info(pid(X, Y, Z))\fR\&, but location transparent\&.
.RE

.LP
.nf

.B
l(Module) -> code:load_ret()
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Module = module()
.br
.RE
.RE
.RS
.LP
Purges and loads, or reloads, a module by calling \fIcode:purge(Module)\fR\& followed by \fIcode:load_file(Module)\fR\&\&.
.LP
Notice that purging the code means that any processes lingering in old code for the module are killed without warning\&. For more information, see \fIcode/3\fR\&\&.
.RE

.LP
.B
lc(Files) -> ok
.br
.RS
.LP
Types:

.RS 3
Files = [File]
.br
File
.br
.RE
.RE
.RS
.LP
Compiles a list of files by calling \fIcompile:file(File, [report_errors, report_warnings])\fR\& for each \fIFile\fR\& in \fIFiles\fR\&\&.
.LP
For information about \fIFile\fR\&, see \fB\fIfile:filename()\fR\&\fR\&\&.
.RE

.LP
.nf

.B
ls() -> ok
.br
.fi
.br
.RS
.LP
Lists files in the current directory\&.
.RE

.LP
.nf

.B
ls(Dir) -> ok
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Dir = \fBfile:name()\fR\&
.br
.RE
.RE
.RS
.LP
Lists files in directory \fIDir\fR\& or, if \fIDir\fR\& is a file, only lists it\&.
.RE

.LP
.nf

.B
m() -> ok
.br
.fi
.br
.RS
.LP
Displays information about the loaded modules, including the files from which they have been loaded\&.
.RE

.LP
.nf

.B
m(Module) -> ok
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Module = module()
.br
.RE
.RE
.RS
.LP
Displays information about \fIModule\fR\&\&.
.RE

.LP
.nf

.B
memory() -> [{Type, Size}]
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Type = atom()
.br
Size = integer() >= 0
.br
.RE
.RE
.RS
.LP
Memory allocation information\&. Equivalent to \fB\fIerlang:memory/0\fR\&\fR\&\&.
.RE

.LP
.nf

.B
memory(Type) -> Size
.br
.fi
.br
.nf

.B
memory(Types) -> [{Type, Size}]
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Types = [Type]
.br
Type = atom()
.br
Size = integer() >= 0
.br
.RE
.RE
.RS
.LP
Memory allocation information\&. Equivalent to \fB\fIerlang:memory/1\fR\&\fR\&\&.
.RE

.LP
.nf

.B
nc(File) -> {ok, Module} | error
.br
.fi
.br
.nf

.B
nc(File, Options) -> {ok, Module} | error
.br
.fi
.br
.RS
.LP
Types:

.RS 3
File = \fBfile:name()\fR\&
.br
Options = [Option] | Option
.br
Option = \fBcompile:option()\fR\&
.br
Module = module()
.br
.RE
.RE
.RS
.LP
Compiles and then loads the code for a file on all nodes\&. \fIOptions\fR\& defaults to \fI[]\fR\&\&. Compilation is equivalent to:
.LP
.nf

compile:file(File, Options ++ [report_errors, report_warnings])
.fi
.RE

.LP
.nf

.B
nl(Module) -> abcast | error
.br
.fi
.br
.RS
.LP
Types:

.RS 3
Module = module()
.br
.RE
.RE
.RS
.LP
Loads \fIModule\fR\& on all nodes\&.
.RE

.LP
.nf

.B
pid(X, Y, Z) -> pid()
.br
.fi
.br
.RS
.LP
Types:

.RS 3
X = Y = Z = integer() >= 0
.br
.RE
.RE
.RS
.LP
Converts \fIX\fR\&, \fIY\fR\&, \fIZ\fR\& to pid \fI<X\&.Y\&.Z>\fR\&\&. This function is only to be used when debugging\&.
.RE

.LP
.nf

.B
pwd() -> ok
.br
.fi
.br
.RS
.LP
Prints the name of the working directory\&.
.RE

.LP
.nf

.B
q() -> no_return()
.br
.fi
.br
.RS
.LP
This function is shorthand for \fIinit:stop()\fR\&, that is, it causes the node to stop in a controlled fashion\&.
.RE

.LP
.nf

.B
regs() -> ok
.br
.fi
.br
.nf

.B
nregs() -> ok
.br
.fi
.br
.RS
.LP
\fIregs/0\fR\& displays information about all registered processes\&. \fInregs/0\fR\& does the same, but for all nodes in the network\&.
.RE

.LP
.nf

.B
uptime() -> ok
.br
.fi
.br
.RS
.LP
Prints the node uptime (as specified by \fIerlang:statistics(wall_clock)\fR\&) in human-readable form\&.
.RE

.LP
.B
xm(ModSpec) -> void()
.br
.RS
.LP
Types:

.RS 3
ModSpec = Module | Filename
.br
 Module = atom()
.br
 Filename = string()
.br
.RE
.RE
.RS
.LP
Finds undefined functions, unused functions, and calls to deprecated functions in a module by calling \fIxref:m/1\fR\&\&.
.RE

.LP
.B
y(File) -> YeccRet
.br
.RS
.LP
Types:

.RS 3
File = name()
.br
YeccRet
.br
.RE
.RE
.RS
.LP
Generates an LALR-1 parser\&. Equivalent to:
.LP
.nf

yecc:file(File)
.fi
.LP
For information about \fIFile = name()\fR\&, see \fB\fIfilename(3erl)\fR\&\fR\&\&. For information about \fIYeccRet\fR\&, see \fB\fIyecc:file/2\fR\&\fR\&\&.
.RE

.LP
.B
y(File, Options) -> YeccRet
.br
.RS
.LP
Types:

.RS 3
File = name()
.br
Options, YeccRet
.br
.RE
.RE
.RS
.LP
Generates an LALR-1 parser\&. Equivalent to:
.LP
.nf

yecc:file(File, Options)
.fi
.LP
For information about \fIFile = name()\fR\&, see \fB\fIfilename(3erl)\fR\&\fR\&\&. For information about \fIOptions\fR\& and \fIYeccRet\fR\&, see \fB\fIyecc:file/2\fR\&\fR\&\&.
.RE

.SH "SEE ALSO"

.LP
\fB\fIfilename(3erl)\fR\&\fR\&, \fB\fIcompile(3erl)\fR\&\fR\&, \fB\fIerlang(3erl)\fR\&\fR\&, \fB\fIyecc(3erl)\fR\&\fR\&, \fB\fIxref(3erl)\fR\&\fR\&