Essential Books

Reading an entire file into an array

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Reading in a single step: 

IFS=$'\n' read -r -a arr < file

Reading in a loop: 

arr=()
while IFS= read -r line; do
  arr+=("$line")
done

Using mapfile or readarray (which are synonymous): 

mapfile -t arr < file
readarray -t arr < file
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Arrays:
*Arrays
*Array Assignments
*Accessing Array Elements
*Array Modification
*Array Length
*Array Iteration
*Associative Arrays
*Looping through an array
*Destroy Delete or Unset an Array
*List of initialized indexes
*Array from string
*Reading an entire file into an array
*Array insert function
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