i have a text file with many urls
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..
i.e.
array[0]
array[1]
array[2]
array[3]
thanks guys
Pure bash way:
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]}
# ...
${array[@]} and "${array[@]}" return different things.array=("a b" "c d") to see the differenceOne concern with ( $(< file.txt) ) is if a line in the file can contain whitespace. Consider the array produced from
a b
c
d
The array would have 4 elements, not 3. URLs cannot contain whitespace, so it is not an issue here. For the general case, bash 4 provides a mapfile command which ensures that each line provides a single element for an array.
mapfile array < file.txt
is a one-step replacement for the following loop:
while IFS= read -r line; do
array+=( "$line" )
done < file.txt
If you want to have the array be in your script instead of reading a file you can use this approach.
#!/bin/bash
array=(
"www.example1.com"
"www.example2.com"
"www.example3.com"
"www.example4.com"
)
for URL in "${array[@]}"; do
echo "$URL"
done
