Operations engineers must have 150 commands (serial ... ）

OPS engineers must have 150 commands

1.mkdir make directory Create directory, example: Mkdir/data means to create a data directory under the root.

2.CD Change directorys switch directory, example: CD/ presentation into the root directory.

3.ls list directory, example: Ls/etc,-l (long) long format displays the directory or file attributes.

-d (directory), which means viewing the directory

4.Touch Create file or change file timestamp, example: Touch/data

5.pwd Print work Dirtorys printing working directory (path), example: pwd

6.vi Notepad (simple, less functional)

7.Vim Editor (complex, more functions)

8.Cat View the contents of the file (edit, append). Example: Cat Oldboy.txt

Example:

Cat >>/data/oldboy1.txt<<eof

I am studying Linux.

Eof

9.Echo is a printout of the contents of something, example: Echo ' I am study Linux. '

Example:

Echo '

1111

2222

3333

' >>oldboy.txt

Example:

Echo-e ' I am study linux\ni am study Linux ' >>b.txt

Relative path and absolute path

Windows absolute path: E:\2016-old boy-common OPS tool, the path from the beginning.

Linux absolute path: Cat/etc/sysconfig/network-scripts/ifcfg-eth0 The path from the/start.

relative path: The cat Etc/sysconfig/network-scripts/ifcfg-eth0 does not start from/to the path without starting from scratch.

Special symbols:

> or 1> output redirection, the front of the input into the following file, will erase the original contents of the file.

>> or 1>> Chase aggravating the direction, the front of the things entered into the tail of the file, will not erase the original contents of the file.

< or 0< input redirection, example: Xargs-n 2 <b.txt

<< or 0<< append input redirection,

2> Error redirection,

2>> Error Append redirect,

Description

1. The direction of the cutting head is the flow of data.

2. Number Description:

A. Standard input (stdin): code 0, using < or << data flow from right to left

B. Normal output (STDOUT): Code 1, using > or >>, Data flow from left to right. echo oldboy >a.txt 2>&1 = echo Oldboy >a.txt 2>&1

C. Error output (stderr): Code 2, using 2> or 2>>, data flow from left to right. cho Oldboy 2>a.txt 1>b.txt

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Operations engineers must have 150 commands (serial ... ）