Simply, the Sleep command is used in Bash shell scripts to delay the runtime of a script for a specified period before it starts running again. You can make a Bash script sleep for seconds, minutes, hours, or even days using the suffixes S, M, H, or D, respectively. Examples of Sle...
Usingsleepon the command line instructs Bash to suspend processing for the duration you provided. In our example this was five seconds. We can pass durations tosleepin days, hours, and minutes, as well as in seconds. To do this include a suffix of eitherd, h, m,orswith the duration. ...
If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: #!/bin/bashwhile[!-ddirectory_expected]doecho"`date`- Still waiting"sleep1doneecho"DIRECTORY IS THERE!!!" 3. Using a while loop to manipulate a ...
entry widgets, checkboxes, radio buttons, labels, plain text fields, scrollbars, etc., to text user interfaces. This package also contains the shared library needed by programs built with newt, as well as a CLI application whiptail, which provides the most ...
Chapter 11. Introduction to Shell Scripts(第 11 章 Shell 脚本简介 Shell 脚本简介) If you can enter commands into the shell, you can write shell scripts (also known as Bourne shell scripts). A shell script is a series of commands written in a file; the shell reads the commands from the...
For example, let’s say we want to run the “sleep” command for five seconds, but we want to timeout the command after three seconds and here is the example shell script: #!/bin/bash echo "Starting sleep command with timeout of 3 seconds..." timeout 3s sleep 5s echo "Sleep comma...
Create an Infinite Loop in Scripts You can create an infinite loop using afalsestatement as an expression. When you try to simulate infinite loops try to usesleepwhich will pass the script periodically. count=0 until false do echo "Counter = $count" ...
Another way to find the elapsed time in bash script is by using date command, with the ‘date’ command, you can retrieve the current date and time in a specified format, and store it in a variable, here is the syntax for it:
If a script requires multiple inputs, we can simply useprintfto answer them in the specified order. 3.1. A Sample Script That Requires Multiple Inputs Let’s consider a bash script that asks three simple questions to the user: #!/usr/bin/env bashecho"Hello, please introduce yourself."echo...
Using Date in Scripts Enabling a Bash shell script to print the time and date is trivial. Create a text file with the following content, and save it asgd.sh. #!/bin/bash TODAY=$(date +"Today is %A, %d of %B") TIMENOW=$(date +"The local time is %r") ...