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  1. Prepare
  2. Linux Shell
  3. Arrays in Bash
  4. Read in an Array
  5. Discussions

Read in an Array

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  • tomade
     + 4 comments
    a=($(cat))
echo ${a[@]}

  • ravimourya
     + 6 comments
    #!bin/ksh
i=0
while read line
do
array[$i]=$line
((i+=1))
done

echo ${array[@]}

  • framirez72
     + 3 comments

    How do we loop through all the entries? When do we stop?

  • mattphihughes
     + 1 comment

    For folks who want to use an array (which it's pretty obvious is thoroughly unnecessary), you may be interested in the readarray builtin added in bash 4

    Some documentation here for mapfile, which is the same thing by another name

  • lukehod
     + 1 comment

    Here is my answer following the guidelines of actually reading input into an array first:

    i=0

while read val
do
    array[$((i++))]=$val
done

echo "${array[*]}"

    We loop through the input line-by-line using the while loop and put the value in the ith position in the array. After all input is read, you can print out the entire phrase using echo "${array[*]}"orecho "${array[@]}" (they are equivolent here).

    If you are wondering, the array[$((i++))] is simply increasing the value of i after it is used to refer to the ith position in the array. It is the same as writing:

    ...
do
    array[$i]
    ((i++))
...
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