1. 从键盘读取输入内容 #!/bin/bash read -p 'please input something:' input echo 'your input:' $input 运行效果: ./read.sh please input something:123your input: 123 2. 循环及分支 #!/bin/bashprintf '\nplease input a number or
echo"FILE EXTENSION = ${EXTENSION}"echo"SEARCH PATH = ${SEARCHPATH}"echo"DEFAULT = ${DEFAULT}"echo"Number files in SEARCH PATH with EXTENSION:"$(ls-1"${SEARCHPATH}"/*."${EXTENSION}" | wc -l) if [[ -n $1 ]]; then echo "The non option arguments are:" $@ fi EOF chmod +x...
--gid --no-create-home --selinux-user [root@host ~]# useradd -- ①按Tab键两次。 命令历史记录 history命令显示之前执行的命令的列表,带有命令编号作为前缀。 感叹号字符(!) 是元字符,用于扩展之前的命令而不必重新键入它们。!number命令扩展至与指定编号匹配的命令。!string命令扩展至最近一个以指定字符...
WebGL: Count the number of rendered vertices Using the WebGL API, is there a way to count the number of vertices rendered within a given canvas? I've seen some tools that attempt to accomplish this task but some are giving strange results (e.g. ... ...
In this example,RANDOM % 100generates a random number between 0 and 99. By adding 1 to the result (1 + RANDOM % 100), we shift the range to be between 1 and 100. Each time you run this script, a new random number within this range will be printed. ...
To begin with, we can usesedto add a thousands separator. Thesedcommand enables us to perform text transformations using regular expressions.We can use it to insert commas as a thousands separator within a number: $ echo "123456789" | sed ':a;s/\B[0-9]\{3\}\>/,&/;ta' 123,456,...
bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then e...
printf'message to print' YPeegPe之前的公式过于简化;事实上,printf 还允许您格式化字符串(不仅仅是用于打印;它的作用还不止于此)。让我们看一个例子:如果我们想显示网络中活动主机的数量,我们可以使用以下模式: printf"%s %d\n""Number of live hosts:" ...
$ todo -r 2 Sucessfully removed task number 2 01). The first task Tue Jun 26 14:51:30 IST 2018 要清除所有任务,运行: $ todo -c Tasks cleared. 19、 Transfer Transfer 脚本允许你通过互联网快速轻松地传输文件和目录。 让我们上传一个文件: $ transfer test.txt Uploading test.txt ### 100.0...
random_number.sh - prints a random integer between two integer arguments (inclusive) random_string.sh - prints a random alphanumeric string of a given length shields_embed_logo.sh - base64 encodes a given icon file or url and prints the logo=... url parameter you need to add the shields...