Shulou(Shulou.com)06/02 Report--

Do not know how to use linux's read to read a single row of data? In fact, it is not difficult to solve this problem. Let the editor take you to learn how to solve it. I hope you will gain a lot 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 format: read [parameters]

Common parameters:

-an is followed by a variable, which is considered to be an array and assigned to it. By default, a space is used as a separator-- d is followed by a marker, but only the first character after it is useful. as a sign of the end-p is followed by a prompt, that is, to print a prompt before typing-e can use the command completion function when typing-n followed by a number Defines the length of the input text-- r mask\, if not,\ as an escape character, or a normal character if possible-- s quiet mode, which is no longer displayed on the screen when entering characters-- t followed by seconds, defines the waiting time for input characters-- u followed by fd, read from the file descriptor, which can be newly opened by exec.

Reference example

Simple read:

#! / bin/bash echo "enter the website name:" read file echo "the website name you entered is $file" exit 0

Allows you to specify a prompt directly on the read command line:

#! / bin/bashread-p "enter the website name:" fileecho "the website name you entered is $file" exit 0

Specifies the number of seconds the read command waits for input, and when the time expires, the read command returns a non-zero exit status:

#! / bin/bashif read-t 5-p "enter the site name:" filethen echo "the site name you entered is $file" else echo "\ nSorry, your input timed out." Fiexit 0

Sets the number of characters entered by the read command. When the number of characters entered reaches a predetermined number, it automatically exits and assigns the entered data to the variable:

#! / bin/bashread-N1-p "Do you want to continue [Ygamma N]?" Answercase $answer inY | y) echo "fine, continue"; N | n) echo "ok,good bye";; *) echo "error choice";; esacexit 0

Make the data entered in the read command not displayed on the command terminal:

#! / bin/bashread-s-p "Please enter your password:" passecho "\ nThe password you entered is $pass" exit 0 Thank you for reading this article carefully. I hope it is helpful for the editor to share the use of linux's read to read single-line data. At the same time, I also hope that you will support us, pay attention to the industry information channel, and find out if you encounter problems. Detailed solutions are waiting for you to learn!

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