Erlang shell Command Chinese user manual

Reproduced from--no flowering tree: http://blog.csdn.net/mycwq/article/details/16858805

The finishing is very complete, so brought over,

The Erlang shell is a tool that uses commands and Erlang interaction in command-line mode. The Erlang shell is powerful and can be directly compiled, loaded, executed, debugged, and so on, and can be used by the shell as a terminal for Erlang projects. This article will introduce the Erlang shell commands, and simply illustrate them as examples.

Opens the Help information for Erlang Shell, which becomes Chinese here. You can also look at the official documents

Shell function Help

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2. Eshell V5.10.2 (abort with ^g)
4. 1> Help ().
6. * * Shell built-in commands * *
8. B ()--Show all the bound variables
10. E (N)--Repeat a query <N>
12. F ()--Release all bound variables
14. F (X)--releasing a variable of a binding
16. H ()--Show previous actions
18. History (N)--Set the number of bars before the Save Action command
20. Results (N)--Sets the number of results of the operation before saving
22. Catch_exception (Bool)--exception handling during the execution of the set
24. V (N)--use the value of a query <N>
26. RD (R,D)--Define a record
28. RF ()--Remove all record
30. RF (R)--Remove a record
32. RL ()--Show all record
34. RL (R)--Display a record information
36. RP (term)--Displays all the contents of a tuple
38. RR (file)--reads the record definition from a file or module
40. * * C Module Command * *
42. BT (PID)--shows the stack backtracking of a process
44. C (File)--Compile and reload the module
46. CD (Dir)--Change Working directory
48. Flush ()--Refresh the mailbox (so the shell receives the message)
50. Help ()--Information
52. I ()--Display System Information
54. Ni ()--Displays system information as well as I () and also includes system information for network nodes
56. I (x, Y, z)--get information about a process with PID <X,Y,Z>
58. L (module)--load or reload modules
60. LC ([File])--Compile a list of Erlang modules
62. LS ()--Displays the list of files in the current working directory
64. LS (Dir)--Displays a list of files in a directory
66. M ()--Displays the modules that have been loaded into the system
68. M (Mod)--Display a module information
70. Memory ()--Shows the allocation information
72. Memory (T)--Displays an information about an allocation <T>
74. NC (File)--Compile and load modules on all nodes
76. NL (module)--reload module at all nodes
78. PID (x, Y, z)-PID <X,Y,Z> acquisition of a process PID
80. PWD ()--Show Current working directory
82. Q ()--close Erlang shell
84. Regs ()--Show registered process information
86. Nregs ()--Displays registered process information as well as regs (), and also includes process information for network nodes
88. XM (M)--find functions not defined in a module, unused functions, deprecated functions
90. Y (file)--Compile the Yecc file (. Yrl)
92. * * I module Command * *
94. IH ()--Display the help information of the I module
96. True

Shell Function Description

1. Show bound variables

B ()--Show all the bound variables

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1. 1> [A,b,c] = [A.]
2. [A]
3. 2> B ().
4. A = 1
5. B = 2
6. C = 3
7. Ok

2. Repeat Query

E (N)--Repeating a query

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1. 3> e (1).
2. [A]

3. Release the binding variable

F ()--Release all bound variables
F (X)--releasing a variable of a binding

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1. 4> A.
2. 1
3. 5> f (A).
4. Ok
5. 6> A.
6. * 1:variable ' A ' is unbound
7. 7> B.
8. 2
9. 8> f ().
10. Ok
11. 9> B.
12. * 1:variable ' B ' is unbound
13. 10> C.
14. * 1:variable ' C ' is unbound

4. Using Query Results

V (N)--use the value of a query

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1. 11> A1 = V (4).
2. 1
3. 12> A1.
4. 1

5. Record operation

RD (R,D)--Define a record
RF ()--Remove all record
RF (R)--Remove a record
RL ()--Show all record
RL (R)--Display a record information

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1. 13> Rd (person, {name, age, address, salary, children}).
2. Person
3. 14> Rd (Child, {name, age}).
4. Child
5. 15> RL ().
6. -record (Child,{name,age}).
7. -record (Person,{name,age,address,salary,children}).
8. Ok
9. 16> RL (Child).
10. -record (Child,{name,age}).
11. Ok

6. Display meta-group content

RP (term)--Displays all the contents of a tuple

The Erlang shell automatically omits tuples that have too long content and can be fully displayed using the RP command

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1. 17> lists:seq (1,50).
2. [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,
3. 23,24,25,26,27,28,29| ...]
4. 18> RP (Lists:seq (1,50)).
5. [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,
6. 23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,
7. 43,44,45,46,47,48,49,50]
8. Ok

7. Working directory

CD (Dir)--Change Working directory

PWD ()--Get working directory

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1. 19> pwd ().
2. D:/tmp
3. Ok
4. 20> CD ("d:/").
5. d:/
6. Ok
7. 21> pwd ().
8. d:/
9. Ok

8. Process operation

Self ()--get current process PID

PID (x, Y, z)-PID <X,Y,Z> acquisition of a process PID
Exit (Pid)--Kill a process
Catch_exception (Bool)--exception handling during the execution of the set

Erlang shell Command Chinese user manual