Bash is commonly used interactively, but it can also be used to write shell scripts. Almost any computer task can be automated using a Bash script. Bash scripts can be run on demand or scheduled to run periodic
pgrep-a[Command] pgrep命令搜索命令并显示进程 ID (PID) 以及正在执行的命令详细信息。 例如,pgrep -a sleep会将相关的后台进程显示为: PID sleep 10 在这里,PID 表示分配给睡眠命令的进程 ID。 控制运算符 & 和 nohup 命令之间的区别 以下是使用&和nohup在后台运行命令或进程之间的一些区别。 nohup 可以捕获...
Loops allow you to run one or more commands multiple times until a certain condition is met. In Bash, break and continue statements allows you to control the loop execution.
The first character of PS4 is replicated multiple times, as necessary, to indicate multiple levels of indirection. The default is "+ ". SHELL The full pathname to the shell is kept in this environment variable. If it's not set when the shell starts, bash assigns to it the full pathname...
Suppose that the remote copy is the most expensive operation of this whole script and that you're willing or able to re-run this script, maybe using cron or doing so by hand two times during the day to ensure you pick up the files if one or more systems are down....
Instead of manually entering each command one by one, a Bash script lets you run multiple commands consecutively with just a single trigger. Bash scripts are powerful tools in the hands of both beginners and seasoned professionals. They simplify complex tasks, enhance efficiency, and ensure ...
Handle multiple task dependencies running on multiple hosts This last example has less to do withcronand Bash and more with creating a complex pipeline of tasks that can run on different machines and have interdependencies. Cronspecifically is not very good at putting together multiple tasks that ...
again. Note that the process is paused, so if you’re running something like tail on a file, the process will have some catching up to do. If you have multiple jobs running in the background fg 3 , for example, will resume the 3rd job. Don’t forget to run the jobs command to ...
times, trap,true, type, typeset,7ulimit, umask, unalias, unset,wait- bash built-incommands, see bash(1)89BASH BUILTIN COMMANDS10Unless otherwise noted, each builtin command documentedinthis section as accepting options preceded by - accepts --to signify the11end of the options. The :,true...
`command` 命令替换,如 filename=`basename /usr/local/bin/tcsh` --- [root@192 ~]# bash Test.sh 10 11 12& [1] 3441 [root@192 ~]# 11111 3 10 11 12 10 11 12 0 Test.sh 10 11 12 3441 [root@192 ~]# cat Test.sh while true ...