将URL从文本文件解析为bash shell数组

i have a text file with many urls

我有一个包含许多网址的文本文件

www.example1.com
www.example2.com
www.example3.com
www.example4.com

How would i go about iterating through it, and parsing each url into an array instance..

我将如何迭代它,并将每个url解析为数组实例..

i.e.

array[0]
array[1]
array[2]
array[3]

thanks guys

2 个解决方案

#1

Pure bash way:

纯粹的bash方式:

array=($(<inFile))

then:

# list all the elements of array
echo "${array[@]}"

# echo num of elements in array
echo ${#array[@]}

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

# 1st element of array
echo ${array[0]}

# 2nd element of array
echo ${array[2]}

# ...

#2

One concern with ( $(< file.txt) ) is if a line in the file can contain whitespace. Consider the array produced from

($( ))的一个问题是文件中的一行是否可以包含空格。考虑从中生成的数组

a b
c
d

The array would have 4 elements, not 3. URLs cannot contain whitespace, so it is not an issue here. For the general case, bash 4 provides a mapfile command which ensures that each line provides a single element for an array.

该数组将有4个元素,而不是3. URL不能包含空格,因此这不是问题。对于一般情况,bash 4提供了mapfile命令,该命令确保每行为数组提供单个元素。

mapfile array < file.txt

is a one-step replacement for the following loop:

是以下循环的一步替代:

while IFS= read -r line; do
    array+=( "$line" )
done < file.txt

#1