% (1).快速浏览 3.13 节，然后测试并记忆这些行编辑命令
在 Erlang shell 中输入
Ctrl + A 行首
Ctrl + D 删除当前字符
Ctrl + E 行尾
Ctrl + F或右箭头 向前的字符（类似跨越一个单词）
Ctrl + B或左箭头 向后的字符
Ctrl + P或上箭头 前一行
Ctrl + N或下箭头 下一行
Ctrl + T 调换最近两个字符的位置
Ctrl + Tab 尝试扩展当前模块或函数的名称（补全）% (2).在 shell 里输入 help() 命令。你将会看到一长串命令。
% 可以试一试其中一些命令。
1> help().
** shell internal commands **
b() -- display all variable bindings
e(N) -- repeat the expression in query <N>
f() -- forget all variable bindings
f(X) -- forget the binding of variable X
h() -- history
history(N) -- set how many previous commands to keep
results(N) -- set how many previous command results to keep
catch_exception(B) -- how exceptions are handled
v(N) -- use the value of query <N>
rd(R,D) -- define a record
rf() -- remove all record information
rf(R) -- remove record information about R
rl() -- display all record information
rl(R) -- display record information about R
rp(Term) -- display Term using the shell's record information
rr(File) -- read record information from File (wildcards allowed)
rr(F,R) -- read selected record information from file(s)
rr(F,R,O) -- read selected record information with options
** commands in module c **
bt(Pid) -- stack backtrace for a process
c(File) -- compile and load code in <File>
cd(Dir) -- change working directory
flush() -- flush any messages sent to the shell
help() -- help info
i() -- information about the system
ni() -- information about the networked system
i(X,Y,Z) -- information about pid <X,Y,Z>
l(Module) -- load or reload module
lc([File]) -- compile a list of Erlang modules
ls() -- list files in the current directory
ls(Dir) -- list files in directory <Dir>
m() -- which modules are loaded
m(Mod) -- information about module <Mod>
memory() -- memory allocation information
memory(T) -- memory allocation information of type <T>
nc(File) -- compile and load code in <File> on all nodes
nl(Module) -- load module on all nodes
pid(X,Y,Z) -- convert X,Y,Z to a Pid
pwd() -- print working directory
q() -- quit - shorthand for init:stop()
regs() -- information about registered processes
nregs() -- information about all registered processes
uptime() -- print node uptime
xm(M) -- cross reference check a module
y(File) -- generate a Yecc parser
** commands in module i (interpreter interface) **
ih() -- print help for the i module
% (3).试着用一个元祖来表示一座房子，
% 再用一个贩子列表来表示一条街道。
% 请确保你能向这些结构中加入数据结构或从中取出数据。
1> BigHouse = {bigHouse, piano, cat, dog}.
{bigHouse,piano,cat,dog}
2> SmallHouse = {smallHouse, tortoise}.
{smallHouse,tortoise}
3> Street = {street, BigHouse, SmallHouse}.
{street,{bigHouse,piano,cat,dog},{smallHouse,tortoise}}
4> {street, B, S} = Street.
{street,{bigHouse,piano,cat,dog},{smallHouse,tortoise}}
5> B.
{bigHouse,piano,cat,dog}
6> S.
{smallHouse,tortoise}
7>