Bash while Loop with sleep Command The sleep command is used to add delay in the script. The delays control the execution of the instructions and create timeouts. Let’s display the 5-second count to the standard output using thewhile loopandsleepcommand. #!/bin/bash i=1 while [ $i -l...
while : do echo "This is another infinite loop." sleep 1 done 在这两个例子中,true和:命令总是返回状态码0(表示成功),因此循环会无限进行下去。 说明如何安全地中断bash中的无限循环: 要安全地中断Bash中的无限循环,可以使用Ctrl+C组合键。这将发送一个中断信号给正在运行的脚本或命令,强制其停止执行。
#!/bin/bash while true do if [ `date +%H` -ge 17 ]; then exit # exit script fi echo keep running ~/bin/process_data # do some work done 如果要退出循环而不是退出脚本,请使用 break 命令而不是 exit。 #!/bin/bash while true do if [ `date +%H` -ge 17 ]; then break # exit...
你可以简单地运行命令bash或sh(我们之后会讲到这两个命令),加上文件名即可来运行你的示例程序。 你可能已经注意到了,我将文件扩展名改成了.sh,在文件名如bashscriptfile.sh中使用.sh扩展名表示这是一个 shell 脚本,包含一系列由 Unix shell 运行的命令。 现在,让我们写一个更好的 shell 脚本,。在上面的文件...
nano whileloop.sh Then paste in the following: #!/bin/bash n=0 while : do echo Countdown: $n ((n++)) done This will work as a countdown to infinity until you pressCTRL + Cto stop the script. Now that we’ve tested the while loop, we can move on to the for loop. Create a...
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!!!" ...
/bin/bashcdsleep3ls pwd 小quiz:假设我现在在/home/yourname/dir1/dir2/dir3/下,并且运行cd命令后,我会回到/home/yourname/。那么请问上面这个例子中的bash script运行完后,我会在哪里? 可以动手试一试。也许结果和想的不一样。 除了上面的./example.sh的方法,另一种运行bash script的方式是bash example....
Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e option. #!/bin/bash while [ ! -e myfile ]; do # Sleep until file does exists/is created ...
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问带有if语句的Bash while循环停滞在true循环中ENPython 编程中 while 语句用于循环执行程序，即在某条件...