How to use read command in Linux system

This article will explain in detail how to use the read command in the Linux system. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The Linux read command is used to read values from standard input. Read internal commands are used to read a single line of data from standard input. This command can be used to read keyboard input and to read a line of data in a file when redirecting is used.

Syntax read (option) (parameter)

Option-p: prompt when you specify the read value

-t: specifies the time to wait when reading the value (in seconds).

Parameter variable: specifies the variable name of the read value.

The instance uses the read command to read the variable value from the keyboard and assign the value to the specified variable. Enter the following command:

Read v1 v3 # read variable value

After executing the above instructions, you are required to type two pieces of data, as follows:

Linux c + # input data

When you are finished, you can use the echo command to output the value of the specified variable and enter the following command:

Echo v3 # output variable value

After executing the command that outputs the value of the variable, the data value entered by the user is displayed, as follows:

Linux c + # output variable value

Note: when you use the echo command to output a variable value, you must add the symbol $before the variable name. Otherwise, echo will output the variable name directly.

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