test.sh
#!/bin/bash
echo “Script name$0”
echo “The first parameter $1”
echo “The second parameter $2”
echo “The third parameter $3”
echo “The fourth parameter $4”
echo “The fifth parame
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 exercise -20
Question requirements Write a greeting program that can output greetings to the user according to the current time of the system when it is executed. Assume that from midnight to noon is morning, n
Shell read-only variable
test.sh:
#!/bin/bash
myUrl=”http://www.google.com span>”
readonly myUrl
myUrl=”http://www.runoob.com span>” Output
bogon:Desktop macname $ ./test.sh
./test.sh: line 4: myUrl: reado
Record the special variables in the shell script
1. Special location variables
About the above related variables introduction , You can also refer to the man manual, execute the command “man bash”, and then search for the keyword “Special P
Shell – interactive input
Interactive input and for statement (8-15)
Interactive input
1, read Usage: The read command can define multiple variable values at the same time, and the input content can be used as
VIM configuration
Detect installed vim
rpm -qa | grep vi< span style="color: #000000; font-size: 16px;"> Install vim yum -y install vim-enhanced
Replace with vimvi
vi ~/.bashrc #Need to restart or use source to r
My computer thinks Signed Int is less than -1?
See the answer in English> Why is (sizeof(int)> -1) false?
#include
int main(void)
{
printf(“%d”, sizeof(signed int)> -1);
return 0;
} The result is 0(FALSE).
How could this happen?
I am
Bash – single quotes of characters AWK scan string
I have a line and I want to know if there are any embedded single quote characters in it. Using awk, I tried several variations
badix = index($0,” 47″) – this does not find it
badix = index($
[Clear, explain white! 】 VIM editor profile
Vim is a well-known powerful and highly customizable text editor similar to Vi. It has improved many new features on the basis of Vi. Vim is free software. Vim is generally regarded as one of the b
MQTT service – Mosquitto simple installation and TLS two-way authentication configuration
1. Install and configure Mosquitto
1. yum install Mosquitto
yum< /span> install epel-release -y
yum search mosquitto
yum install mosquitto-devel mosquitto -y pre> 2. Configuration Mo