shell script sleep

Sometimes a shell script is used to execute a series of programs sequentially. Some programs do not immediately exit after the stop, for example, there is a tomcat hung, even with the kill-9 command has not been an instant to end. So if the shell

Knowledge before learning shell scripts1) Record command historyThe commands we've knocked on, Linux will be recorded, and presets can record 1000 historical commands. These commands are saved in the. bash_history file in the user's home directory.

What is a shell script. First, it is a script and cannot be used as a formal programming language. Because it's running in the shell of Linux, it's called a shell script. To be blunt, a shell script is a collection of commands. For example, I want

1. Signal ProcessingLinux uses signals to communicate with processes running in the system.Signal Value Description1 SIGHUP Suspend process2 SIGINT Terminate Process3 Sigquit Stop Process9 SIGKILL Unconditional Termination processSIGTERM terminate

  #!/bin/bash( echo "user" sleep 2 echo "passwd" sleep 3 echo "do something in remote device" sleep 3 echo "exit") | telnet IP The above is non-interactive usage. If you need interactive usage, you can use round CT, and then

Loop Control statement:Continue: End this cycle prematurely, and go directly to the next round of cycle judgment;While CONDITION1; DoCMD1...if CONDITION2; ThenContinueFiCmdn...DoneExample: The sum of all even numbers within 100;#!/bin/bash#declare-i

I. about the shellShell, English is shell, the meaning of the shell, as in the computer, there is also a layer of meaning, that is, the shell can be seen as a computer system encapsulation of the shell for the user to use, so the user can manipulate

5.11. cat/etc/passwdYou can view each user's own default shell program.2. The default interactive shell starts when the user logs in to a Virtual Console terminal.But there is another default shell is/bin/sh, which acts as the default shell for

What is a shell script. First, it is a script and cannot be used as a formal programming language. Because it's running in the shell of Linux, it's called a shell script. To be blunt, a shell script is a collection of commands. For example, I want

It's time to enter the fourth chapter, just see a post title: I have a good talent, but unfortunately I am a girl. Khan ~ this ... Music Without Borders, this should not have no gender sector? Fourth Chapter Text Processing tools The book first