Uid=grep"^$UserName:"/etc/passwd|cut-d: -f3`#此处注意变量不要使用UID,会报./usertype.sh: line 7: UID: readonly variable的错误 if[ $Uid -gt 499 ];then echo"$1 is a common user." else echo"$1 is a administrator or system user
登录后复制$./weather.sh 0It's freezing outside ...$./weather.sh 8The weather is cold.$./weather.sh 16The weather is nice.$./weather.sh 30The weather is hot. 在bash 中使用 case 语句 我们还可以在 bash 中使用 case 语句来替换多个 if 语句,其构造的一般语法如下: 登录后复制case"variabl...
$It's freezing outside ...$The weather is cold.$The weather is nice.$The weather is hot. 1. 在bash 中使用 case 语句 我们还可以在 bash 中使用case语句来替换多个 if 语句,其构造的一般语法如下: 复制 case"variable"in"pattern1"Command … ;;"pattern2"Command … ;;"pattern2"Command …...
For example, the following will match a line (stored in the shell variable line) if there is a sequence of characters anywhere in the value consisting of any number, including zero, of characters in the space character class, zero or one instances of‘a’, then a ‘b’: [[ $line =~...
=/data/logs/fizz-gateway JAVA_CMD=/usr/local/java/bin/java PID_FILE="$ 用户1499526 2020/11/30 1.4K0 常用bash脚本功能 bashhttpsbash 指令网络安全编程算法 参考:https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash YP小站 2021/11/269650 shell脚本的...
3. By comparing a variable to an empty string As the name suggests, in this method, I will be comparing the variable to an empty string using the [] operator. Here's the simple script: #!/bin/bash if [ "$variable" = "" ]; then echo "Variable is empty." else echo "Variable is...
- Test if a given string conforms the specified glob/regex: [[ $variable ==|=~ pattern ]] - Test if a given variable is [eq]ual/[n]ot [e]qual/[g]reater [t]han/[l]ess [t]han/[g]reater than or [e]qual/[l]ess than or [e]qual to the specified number: ...
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to '$var'"; fi 参考:https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash 6、换算秒为分钟、小时 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #!/bin/bash a=60100 sw...
numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is equal to 12的回显,然后在fi之后继续执行你的脚本。如果变量大于12的话,就会执行elif语句,并在fi之后继续执行。当你使用if或if/elif语句时,它是自上而下工作...
variable_int=100 # 访问变量, 在变量前添加 $ 符号, 该符号的目的是告诉 Shell 访问变量的值而非变量名本身 # echo 是 Linux 终端命令, 主要将文本, 变量, 和特殊字符输出到标准输出 ( 通常是终端屏幕 ) echo $variable_str echo $variable_int 实际上访问变量时需使用 "" 防止通配符扩展和单词拆分。① ...