Outside the function, we try to access the variable 'inside_variable' and print its value. However, since 'inside_variable' is declared as a local variable inside the function, it is not accessible outside the
printf “%s\n” “usage:$SCRIPT [-h][--help] -c companyid” exit 0 ;; -c ) shift if [ $# -eq 0 ] ; then printf “$SCRIPT:$LINENO:%s\n” “company for -c is missing” >&2 exit 192 fi COMPANY=”$1” ;; -* ) printf“$SCRIPT:$LINENO: %s\n” “switch $1 not suppo...
# 位置参数调用, 假设在终端输入 bash bash_tutorial.sh 1 2 3 echo "current script name: \$0 $0" # 当前脚本名称 echo "incoming parameters: \$1 $1 \$2 $2 \$3 $3" # 访问传入的参数 echo "the number of parameters: \$# $#" # 传入的参数数量 echo "all parameters: \$@ $@" # ...
# Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 1. 2. 3. 4. 5. 6. 7. 8. 9. 或者,在bash4.3+上: $ hello_world="value" $ var="world" # Declare a namere...
source ./script.sh . ./script.sh # source 命令的简化写法 进程替换进程替换(Process Substitution)将一个命令的输出作为一个文件来使用,而不需要创建一个实际的临时文件。通常用于将命令的输出传递给只接受文件作为输入的命令。语法:<(some command) <( ) 会将括号中的命令放入后台执行,并将其输出连接到一个...
Hello Worldis the most simple bash script to start with. We will create a new variable calledlearningbashand print out the wordsHello World. First, open a new shell script file with a text editor of your choice: nano hello.sh Paste the following lines into it: ...
# Usage: basename "path" : "${1%/}" printf '%s\n' "${_##*/}" } 用法示例: $ basename ~/Pictures/Wallpapers/1.jpg 1.jpg $ basename ~/Pictures/Downloads/ Downloads 变量 使用变量分配和访问变量 $ hello_world="value" # Create the variable name. ...
read variable_name 其中,variable_name是你自定义的变量名,用于保存用户输入的值。读取用户输入后,可以通过该变量名来获取输入的内容。 以下是获取用户输入的完整示例代码: 代码语言:txt 复制 #!/bin/bash echo "Please enter your name: " read name echo "Hello, $name! How are you?" 在上述代码中,用户...
Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && operators instead of a Bash If Statement? Detailed Examples & FAQ How to check if a variable exists or is “null”? How to check if a file exists?
variable=$(echo "OPTIONS; OPERATIONS" | bc) 一个实例,不过不推荐你去看其中的算法,你只要只要怎么用bc去盘算就够了 #!/bin/bash # 盘算按月归还存款的数量. echo echo "Given the principal, interest rate, and term of a mortgage," echo "calculate the monthly payment." ...