Article Directory
ex
Start the ex editing mode of the vim editor
Supplementary note:
Start the vim text editor in ex mode. The execution effect of ex is the same as vi -E. For the applicable method and parameters, please refer to the vi command. If you want to return to the normal mode from Ex mode, enter :vi or :visual in vim.
grammar
ex(参数)
parameter
File: Specify the file to be edited.
exec
Call and execute the specified command
Supplementary note:
The exec command is used to call and execute the command of the instruction. The exec command is usually used in shell scripts to call other commands. If the command is used in the current terminal, the terminal will be exited immediately after the specified command is executed.
grammar
exec(选项)(参数)
options
-c: Execute the specified command in an empty environment.
parameter
Instruction: The instruction to be executed and the corresponding parameters.
example
First use the echo command to output the text "Linux C++", enter the following command:
echo Linux C++ # 输出指定信息
After executing the above command, the following information is output:
Linux C++ # 输出信息
Then use the exec command to call the echo command to output the same information, and compare the output information. The input command is as follows:
exec -c echo Linux C++ # 调用命令
After executing the above command, the output information is as follows:
Linux C++ # 使用指定指令输出信息
By comparing the results after the execution of the two, the implemented functions are the same, that is, the echo command is successfully invoked with the exec command.
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[Learn python from zero] 92. Use Python's requests library to send HTTP requests and process responses
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[Learn python from zero] 86. In-depth understanding of HTTP protocol and its role in browser and server communication
[Learn python from zero] 85. Parallel computing technology application of Python process pool
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[learning python from zero] 82. Realization of chat programs based on multi-threading
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[learning python from zero] 66 .In-depth understanding of regular expressions: a powerful tool for pattern matching and text processing
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[Learn python from zero] 55. Serialization and processing in Python Deserialization, application of JSON and pickle modules
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[learning python from zero] 52. Reading and writing files - Python file operation guide
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[learning python from zero] 49. Object-related built-in functions in Python and their usage
[learning python from zero] 48 .Detailed explanation of inheritance and multiple inheritance in Python
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[Learn python from zero] 42. Built-in attributes and methods in Python
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[Learn python from zero] 40. Python magic method (1)
[Learn python from zero] 39. Object-oriented basic grammar and application examples
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