我想写一个循环15个字符串的脚本(可能是数组?)这可能吗?

类似于:

for databaseName in listOfNames
then
  # Do something
end

当前回答

这也很容易阅读:

FilePath=(
    "/tmp/path1/"    #FilePath[0]
    "/tmp/path2/"    #FilePath[1]
)

#Loop
for Path in "${FilePath[@]}"
do
    echo "$Path"
done

其他回答

单线循环,

 declare -a listOfNames=('db_a' 'db_b' 'db_c')
 for databaseName in ${listOfNames[@]}; do echo $databaseName; done;

你会得到这样的输出,

db_a
db_b
db_c

脚本或函数的隐式数组:

除了anubhava的正确答案:如果循环的基本语法是:

for var in "${arr[@]}" ;do ...$var... ;done

bash中有一个特殊情况:

当运行脚本或函数时,在命令行传递的参数将被分配给$@数组变量,您可以通过$1、$2、$3等进行访问。

可以通过以下方式填充(用于测试)

set -- arg1 arg2 arg3 ...

这个数组上的循环可以简单地写:

for item ;do
    echo "This is item: $item."
  done

请注意,中的保留工作不存在,也没有数组名称!

示例:

set -- arg1 arg2 arg3 ...
for item ;do
    echo "This is item: $item."
  done
This is item: arg1.
This is item: arg2.
This is item: arg3.
This is item: ....

注意,这与

for item in "$@";do
    echo "This is item: $item."
  done

然后进入脚本:

#!/bin/bash

for item ;do
    printf "Doing something with '%s'.\n" "$item"
  done

将其保存在脚本myscript.sh、chmod+x myscript.shh中,然后

./myscript.sh arg1 arg2 arg3 ...
Doing something with 'arg1'.
Doing something with 'arg2'.
Doing something with 'arg3'.
Doing something with '...'.

在函数中相同:

myfunc() { for item;do cat <<<"Working about '$item'."; done ; }

Then

myfunc item1 tiem2 time3
Working about 'item1'.
Working about 'tiem2'.
Working about 'time3'.

试试这个。它正在运行和测试。

for k in "${array[@]}"
do
    echo $k
done

# For accessing with the echo command: echo ${array[0]}, ${array[1]}

您可以这样使用:

## declare an array variable
declare -a arr=("element1" "element2" "element3")

## now loop through the above array
for i in "${arr[@]}"
do
   echo "$i"
   # or do whatever with individual element of the array
done

# You can access them using echo "${arr[0]}", "${arr[1]}" also

也适用于多行数组声明

declare -a arr=("element1" 
                "element2" "element3"
                "element4"
                )

我循环浏览一系列项目以进行git pull更新:

#!/bin/sh
projects="
web
ios
android
"
for project in $projects do
    cd  $HOME/develop/$project && git pull
end