Eshell入门【1】

在erlang的bin目录下有个erl，是个软链接，指向 ../lib/erlang/bin/erl

退出Eshell的n种方法

方法一 ctrl+g

-bash-3.2$ erl

Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]

 

Eshell V5.9.2  (abort with ^G)

 

1> %敲按键 ctrl+g，这是根据上面Eshell自己的提示   (abort with ^G) 来的，然后再敲q ，回车，就行了。

1>

User switch command

--> h

  c [nn]            - connect to job

  i [nn]            - interrupt job

  k [nn]            - kill job

  j                 - list all jobs

  s [shell]         - start local shell

  r [node [shell]]  - start remote shell

  q        - quit erlang

  ? | h             - this message

-->q

-bash-3.2$

方法二：q()

-bash-3.2$ erl

Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]

 

Eshell V5.9.2  (abort with ^G)

1> q().

ok

2> -bash-3.2$

 

方法三：halt()

-bash-3.2$ erl -sname yeq

Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]

 

Eshell V5.9.2  (abort with ^G)

(yeq@sgwapp2)1>

(yeq@sgwapp2)1>

(yeq@sgwapp2)1> halt().

-bash-3.2$ erl

 

方法四：ctlr+c【发现还是这个方法快啊】

三次击键： 先输组合键 ctrl+c ，  然后敲 a， 然后敲  回车

-bash-3.2$ erl

Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]

 

Eshell V5.9.2  (abort with ^G)

1>  ^c

BREAK: (a)bort (c)ontinue (p)roc info (i)nfo (l)oaded

       (v)ersion (k)ill (D)b-tables (d)istribution

a

-bash-3.2$

 

---

Eshell 的快捷键

之前录入shell的命令可以用Ctrl+P和Ctrl+N 来找回，也能用类似Emacs的编辑命令来编辑它们。

还没仔细研究。

 

help()的信息

-bash - 3. 2$ erl
Erlang R15B02 (erts - 5. 9. 2) [source] [ 64 -bit] [smp : 4 : 4] [async -threads : 0] [hipe] [kernel -poll :false]
Eshell V5. 9. 2 (abort with ^G)
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
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
true
2>

分布式相关命令

-name NodeName

这个选项使得启动的Erlang的运行时系统处于分布式模式下，节点名称为NodeName@FullyQualifiedName。

引用

-sname NodeName

这个选项使得启动的Erlang的运行时系统也处于分布式模式下，节点名称为NodeName@ShortName。

引用

-setcookie Cookie

该选项设置当前节点的Magic Cookie为Cookie，而不使用默认的~/.erlang.cookie中的内容作为Cookie。

引用

-connect_all false

这个选项设置该启动节点和其他Erlang节点的连接模式为非完全连接，即该节点仅仅保存和他直接通信的节点状态，非直接连接的节点状态不理会。