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Bash Script - Prompt to Confirm (Y/N, YES/NO) - TecAdmin This time I'll show you the while loop and in my Python tutorials I'll get back to the for loop. In a while loop, integer comparison inside the square brackets should be expressed using bash's built-in comparison operators . The if Not Condition in Bash - Delft Stack 我有一个 bash 脚本，它是 perl 脚本的看门狗。如果不是我希望它在控制台中启动它，它会检查 perl 脚本是否正在运行。 . The syntax of infinite While loop is. the if not Condition in the Case of Integers in Bash ; the if not Condition in Case of Strings in Bash ; Bash if not Condition in the Expression ; In bash, if the code of the command list is true, then if | then statements execute one or more commands after the word then.If the check returns false, it executes else, if the condition requires it. Example #1: Integer Comparison in while Loop in bash. Case Statements in Bash: Examples Explained - Linux Handbook You can increase the Linux sleep timer from 10 seconds to any value for which you wish the script to wait before running the same command again. Bash - Tweaks and Tuning - blog.while-true-do.io Conclusion. Example-2: Use bash while loop with "true" - infinite Loop One of the good or bad things with while loop, it's advantage of running the loop for infinite period of time until the condition matches Bash Scripting Cheat Sheet - Learn Linux Configuration The loop starts with the while keyword, followed by a condition (usually written in square brackets). The while loop - Linux Documentation Project Bash While Loop - ByteXD CONTROL-COMMAND can be any command(s) that can exit with a success or failure status. The second match would then be skipped, as there was a match that was already found. read command will read file contents until EOL is interpreted. One of the easiest loops to work with is while loops. Use : command to set an infinite loop: #!/bin/bash # Recommend syntax for setting an infinite while loop while : do echo "Do something; hit [CTRL+C] to stop!" done. There are also a few statements which we can use to control the loops operation. The CONSEQUENT-COMMANDS can be any program, script or . This true condition implies that the loop will continue to execute until some external activity forcefully stops it. 1:30 - Executing the curl command every 100ms in a while loop. The integer value is optional, and it is 1 by default. read command reads each line passed as input from cat command and stores it in the LREAD variable. This example code will prompt for confirming once if you give wrong input, the program will exit with status 1.