Essential Books

Read lines of a file into an array

suggest change 
readarray -t arr <file

Or with a loop: 

arr=()
while IFS= read -r line; do
   arr+=("$line")
done <file
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Read a file:
* Read a file data stream variable line-by-line andor field-by-field
* Looping through a file line by line
* Looping through the output of a command field by field
* Read lines of a file into an array
* Read lines of a string into an array
* Looping through the output of a command line by line
* Read a file field by field
* Read a string field by field
* Read fields of a file into an array
* Read fields of a string into an array
* Looping through a string line by line
* Reads file etcpasswd line by line and field by field
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