Pause Program Execution in Linux Bash
You may sometimes want to pause program execution in a bash script. This could be because of getting input from the user or asking them to confirm a case.
In DOS, you can pausedo this using the command. This article will explain how to readpause the execution of a program using the command.
readUse command to pause program execution in Bash
readThe command causes the program to pause until input is received from the user or a certain period of time. In the rest of this article, we will explain the command's parameters and give examples of its different uses.
The following example gets a character from the user to continue execution.
read -n1 -rp "Press any key to continue: " key
-nThe parameter specifies the number of characters to be taken as input. In this example, it is set to 1.-rThe parameter specifies that the input will be in raw mode. No escape characters are allowed.-pThe -p parameter creates a prompt. If used with$and' ', it allows escaping characters in the text to be printed. When used with double quotes, it prints as plain text.keyis any variable. It stores the characters given as input.
In the following example, the user can press Enterthe key to continue. They do not have to use the character.
Also, in the example, the $and ' 'characters -pare used with the parameter. It allows \nthe character to be used as a line break.
read -rsp $'Press enter to continue\n'
-sParameter is used for silent mode. Characters taken from keyboard will not be reflected on screen.
In the next example, the user must press a key 3 秒within , or the program will continue executing.
read -t3 -n1 -rp "Press [x] to exit in 3 seconds " key
-tThe parameter specifies the timeout in seconds. In this example, it is set to 3 seconds.
In the previous example, the letters Nare printed to the screen by default.
read -rp "Do you want to exit? (y/N) : " -ei "N" key;
-eParameter is used to switch toreadlinemode.-i "N"The parameter specifiesreadlinethe default character for pattern.
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