shell array and declare usage Usage description The declare command is a built-in command of bash, which can be used to declare shell variables and set the attributes of variables (Declare va
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 script prints rectangles
Shell script printing rectangle #!/bin/bash
for ((i=1;i<= 9;i++)) do for ((j=1;j<=9;j++)) do echo -n "*" done echo done
#!/bin/bash
for ((i=1;i<= 9;i++)) do for ((j=1;j<=9;j++)) do echo -n "*" done echo done
WeChat payment interface docking document
Create a sub-package demo, create a controller package, domain package, and service package in the demo Directory structure:
xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:sche
Shell exercise -16
Question requirements Count the number of numbers that appear in each line of the document a.txt and calculate how many numbers appear in the entire document. For example, the content of a.txt is a
Shell script – loop
1. The writing method of for statement based on C language format:
for((i=0;i<10;i++)); do【for (initial conditions ; Conditional judgment statement; Value change statement); do】
loop bo
UNIX foundation day_01
unix operating system
why? Choose an operating system according to user needs
Individual users: windows
Enterprise users: do server-side (website) development
Server-side requirements :
1) Secu
Shell script PPT script
SHELL Script PPT script Write in it on the premise that it can be used
1, determine the type of all files in the /var/ directory
[[email protected] scripts]# cat filetype.sh
#!/bin/ba
8_InlineHook
1 shellcode low 2Gb warning , Should use high 2GB stable: inkernel hook: Because the low 2gb data of each process is different; therefore, the code should be placed at the high 2gb in the kernel h
Shell script TestSrv script (init script or sysv script)
testsrv script (SysV script) I. Description: ? CentOS7 already uses Systemd to manage services, and it is recommended to use Systemd to manage services. ubuntu18.04 is now also a Systemd management
Shell script 8-19
Common logical statements
1, for statement:
for variable in list; do
Loop
done
for((初始语句; 判断语句; 值变化语句)); do
Loop
done
case statement:
2, case variable in
PAT1)