Example 01: Sleep for 1 Second Let’s get started with a simple example of the sleep function in bash. Let’s say, you want to simply display a message “Testing…” on your terminal screen. You have to use the “echo” statement for this along with this message as per the below il...
user@linux:~$ sleepsleep: missing operandTry'sleep --help'formore information. 如果你想等待的时间远远超过几秒钟,sleep还接受指定时间单位(即分钟、小时、天)的参数,所以如果你想等待整整一周,sleep 7d是你的解决方案! 以下是sleep的一些用例。 # wait 500 millisecondssleep 0.5# wait 1 secondsleep1# wa...
sleep 1: Sleep for one second. seconds=$((seconds-1)): Reduces the value of thesecondsvariable by 1. echo: Prints the given text or variable. And if you were to execute the above script, you can expect the following result: 2. Read files line by line There are times when you want...
echo "sleep $1 seconds" sleep $1 echo "awake from sleep" 现在利用我们写的timeout函数来达到超时kill功能: $ time bash timeout.sh2'sh sleep.sh 100'sleep100secondsreal0m2.005s user0m0.002s sys0m0.001s 看最终执行的时间,差不多就是2秒钟。 上面timeout函数实现的代码中,利用了两个技巧: kill ...
echo-n'o';sleep0.5s echo-n'c';sleep0.5s echo-n'k';echo echo"Clock will display soon." echo"Press Ctrl+C to close the program." sleep3s;clear whiletrue do #Display the time date+"%H:%M:%S" #Wait for 1 second sleep1s #Clear the screen every second ...
1. Example: # 取出第一行内容 gpustat | sed -n '1p' 1. 2. 分别取出指定行内容: 融合正则指令 取出第1行以空格为分割的第2个单元内容: # 命令 第一行 以空格为分割的第2个单元内容 command | sed -n '1p' | awk '{print $2}'
sleep 1 # Second sleep Single Quotes or Double Quotes? In Bash, text between single quotes (') are taken as literal text by the Bash interpreter, whereas text between double quotes (") is interpreted (parsed) by the Bash interpreter. Whereas the difference in how things work may not be ...
115 $ echo ${SECONDS}; sleep 1; echo ${SECONDS}; echo $LINENO 174380 174381 116 注意,即便使用;来隔开命令,上面的代码也要分两行10)关联数组 谈到移植到其他语言,一条重要的规则是,如果我需要用到数组,那么我会放弃bash,使用python(为此我甚至创建了一个Docker Container来运行一个专门的工具) ...
$ echo ${LINENO}115$ echo ${SECONDS}; sleep 1; echo ${SECONDS}; echo $LINENO174380174381116 注意,即便使用;来隔开命令,上面的代码也要分两行 TMOUT 可以用来超时读取,在一些脚本中真的很好用 #!/bin/bashTMOUT=5echo You have 5 seconds to respond...readecho ${REPLY:-noreply} ...
sleep 1 ((seconds--)) done echo "Time's up!" Here, I have used asecondsvariable that is initialized at 10. Then, it will print the current value of the variable, sleep for one second, and then reduce one number from thesecondsvariable. ...