Shell Command Test
The command test in the shell is used to check whether a condition is true. It can test numbers, strings and files. Number arguments test...
Shell Flow Control
The flow control of shell cannot be empty which is different from other languages such as Java and PHP.The following is the writing of PHP...
Shell Command Printf
In the previous chapter we learn the command echo, this chapter we will introduce the command printf. Printf mimics the printf () program in the...
Shell Command Echo
Echo in shell is similar to the echo in PHP which all output string.The syntax for echo is: You can use echo to achieve more...
Shell Basic Operators
There are various operators supported by shell.We will now discuss the following operators: Arithmetic Operators Relational Operators Boolean Operators String Operators File Test Operators Bourne...
Shell Arrays
Shell arrays can hold multiple values,Bash shell only support one-dimensional values(can not support multi-dimensional) .We don’t need to define array size during initialization (similar to PHP).The...
Shell Passing Arguments
Arguments can be passed to the script when it is executed,we can get the arguments by the formats like $n.Inside the script, the $1 variable...
Shell Variable
When you define the a variable name, the name should not prefix $(excepting in PHP ),for example your_name="www.linuxcommands.site" We should not add blank space between...
Shell tutorial
The Shell is a program written in C language, it is a bridge use Linux users.The Shell is a command language and a programming language.Shell...
How to sort by size using the du command
The default options of the linux du command are not sorted according to the size of the disk. If you want to display the results...
Directory structure and meaning of Linux system
After the login system, under the command window type the command: You will see as shown in the figure below: Tree directory structure: The following is the explanation for these directories: /bin: Bin is the abbreviation of Binary, this directory holds the...
How to mount volume in docker container
Docker run use -v bind mount a volume. You can also modify the docker hostconfig.json and config.v2.json configuration files to mount volumes to existing docker...
How to map the docker container network port to the host port
When running the docker container, you can use -p for port mapping. This article describes running a new container mapping port and mapping an existing...
How to change permissions folder and all its subfolders and files in linux
Changing the permissions of a folder and its subfolders and files is often used in Linux operations.For example: To change all the directories and files...
How to set docker container host name
When we start a new container, the default host name is the container’s id. This host name is not only easy to remember, but also...