Basically, vi/vim is divided into three modes: Command mode, Insert mode and Last line mode
In command mode
1. Move the cursor p> w(e) Move the cursor to the next word
b move to
Category: Unix
The UNIX operating system (Eunice) is a powerful multi-user, multi-tasking operating system that supports multiple processor architectures. According to the classification of the operating system, it is a time-sharing operating system. It was first developed by KenThompson, Dennis Ritchie and Douglas McIlroy in 1969 Developed in AT&T’s Bell Labs in the year. At present, its trademark rights are owned by the International Open Standards Organization, and only UNIX systems that conform to a single UNIX specification can use the name UNIX, otherwise it can only be called UNIX-like (UNIX-like)
Shell programming actual combat 7
1. Count the number of digits in the document
2. Compare the differences between the files of the two machines
#!/bin/bash
dir=/data/web
[ -f /tmp/md5.list] && >/tmp/md5.lis
Shell Programming Foundation-3
1. while loop
Syntax structure: while condition; do……; done
1) Infinite loop
While:
do
command
done
2) Endless loop
While 1
Do
command
The most complete shell script statement syntax (super detailed)
Blog post outline:
Don’t talk nonsense, just use the grammar example:
Requirement①:
first name and 2. last name, and finally displayed on the screen: “Your full name is:” content:
Shell exercise -15
Question requirements
Write a shell and see if there are custom users (ordinary users) in your Linux system. If so, how many?
Core points
centos6 uid>=500
eentos7 uid>=1000
awk -F’:”
Shell Training Day6 8.20
shell
See 100 linux shell questions.
Function to reduce duplication of code.
Shell is a collection of system commands
The first line starts with #!/bin/bash
#!/bin/bash
echo “123”
w
ls
Sp
Shell, Python time function summary
Sometimes it is necessary to write some timed task scripts, a brief summary, memos.
>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(2018, 5, 23, 17, 16, 33, 61000)
>>> print
Configure the YUM source and operate with YUM
Yum (full name Yellow dog Updater, Modified) is based on RPM package management. It can automatically download and install RPM packages from a specified server, automatically handle dependencies, a
Fourth, CD YUM Source Construction
1, mount the optical drive
https:/ /www.cnblogs.com/healy/p/11428622.html
2 , Make network yum source files invalid
3, enter the configuration file view
4. Invalidate networ
N methods for shell mathematical calculation
let usage method [email protected]:/tmp# n1=5
[email protected]:/tmp# n2=10< br />[email protected]:/tmp# let result=n1+n2
[email protected]:/tmp# echo $result
15
[email protected]:/tmp# let n1++
[