Linux Shell 脚本数组

Shell script arrays

提问by Gábor Varga

I would like to set array elements with loop:

我想用循环设置数组元素：

for i in 0 1 2 3 4 5 6 7 8 9
do
array[$i] = 'sg'
done

echo $array[0]
echo $array[1]

So it does not work. How to..?

所以它不起作用。如何..？

回答by Oliver Charlesworth

Remove the spaces:

删除空格：

array[$i]='sg'

Also, you should access the elements as^*:

此外，您应该以^{* 的形式}访问元素：

echo ${array[0]}

See e.g. http://tldp.org/LDP/abs/html/arrays.html.

参见例如http://tldp.org/LDP/abs/html/arrays.html。

---

---

_{* Thanks to @Mat for reminding me of this!* 感谢@Mat 提醒我这一点！}

回答by harish.venkat

there is problem with your echo statement: give ${array[0]}and ${array[1]}

你的 echo 语句有问题：给${array[0]}和${array[1]}

回答by Zsolt Botykai

It should work if you had declared your variable as array, and print it properly:

如果您已将变量声明为数组，并正确打印它，它应该可以工作：

declare -a array
for i in 0 1 2 3 4 5 6 7 8 9 
do
    array[$i]="sg"
done
echo ${array[0]} 
echo ${array[1]} 

See it in action here.

在这里查看它的实际效果。

HTH

HTH

回答by sehe

My take on that loop:

我对那个循环的看法：

array=( $(yes sg | head -n10) )

Or even simpler:

或者更简单：

array=( sg sg sg sg sg sg sg sg sg sg )

See http://ideone.com/DsQOZfor some proof. Note also, bash 4+ readarray:

请参阅http://ideone.com/DsQOZ以获取一些证据。另请注意，bash 4+ readarray：

readarray array -t -n 10 < <(yes "whole lines in array" | head -n 10)

In fact, readarray is most versatile, e.g. get the top 10 PIDs of processes with bash in the name into array (which could return an array size<10 if there aren't 10 such processes):

事实上， readarray 是最通用的，例如将名称中带有 bash 的进程的前 10 个 PID 放入数组（如果没有 10 个这样的进程，它可以返回一个数组大小<10）：

readarray array -t -n 10 < <(pgrep -f bash)

回答by Praveen Kumar Verma

# Declare Array

NAMEOFSEARCHENGINE=( Google Yahoo Bing Blekko Rediff )

# get length of an array
arrayLength=${#NAMEOFSEARCHENGINE[@]}

# use for loop read all name of search engine
for (( i=0; i<${arrayLength}; i++ ));
do
  echo ${NAMEOFSEARCHENGINE[$i]}
done

Output:

输出：

Google
Yahoo
Bing
Blekko
Rediff

Google
Yahoo
Bing
Blekko
Rediff