BASH - Seeking name function then

Question

Someone please advise what it's called in bash function that reads the file and creates an array from it? Thank you

Possible duplicate of http://stackoverflow.com/questions/9736202/bash-read-file-line-into-array — jitendra, Mar 02 '13 at 00:24
Reading file and creating from file array...is a direct function, but I can not find it — user2093552, Mar 02 '13 at 00:26
@jitendra: The OP is explicitly asking for a built-in, which is different from the linked question (although the built-in might have been an answer for that, it wasn't provided). — rici, Mar 02 '13 at 03:48

score 1 · Accepted Answer · answered Mar 02 '13 at 00:26

1

I'm currently using windows so no bash here but this is how you do it:

value=0;

while read line
do
value=`expr $value + 1`;
arr[$value]=$line;

done < "myfile"

answered Mar 02 '13 at 00:26

Chen Harel

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what makes you think exists a function that does it in bash? – Chen Harel Mar 02 '13 at 00:28
alternatively: `declare -a arr=($(cat myfile))` – Swiss Mar 02 '13 at 00:31
`$( < myfile)` is more efficient. – chepner Mar 02 '13 at 16:23

score 1 · Answer 2 · answered Mar 02 '13 at 03:45

I think you're looking for the built-in mapfile.

From help mapfile:

mapfile: mapfile [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
    Read lines from the standard input into an indexed array variable.

    Read lines from the standard input into the indexed array variable ARRAY, or
    from file descriptor FD if the -u option is supplied.  The variable MAPFILE
    is the default ARRAY.

    Options:
      -n count  Copy at most COUNT lines.  If COUNT is 0, all lines are copied.
      -O origin Begin assigning to ARRAY at index ORIGIN.  The default index is 0.
      -s count  Discard the first COUNT lines read.
      -t                Remove a trailing newline from each line read.
      -u fd             Read lines from file descriptor FD instead of the standard input.
      -C callback       Evaluate CALLBACK each time QUANTUM lines are read.
      -c quantum        Specify the number of lines read between each call to CALLBACK.

    Arguments:
      ARRAY             Array variable name to use for file data.

    If -C is supplied without -c, the default quantum is 5000.  When
    CALLBACK is evaluated, it is supplied the index of the next array
    element to be assigned and the line to be assigned to that element
    as additional arguments.

    If not supplied with an explicit origin, mapfile will clear ARRAY before
    assigning to it.

    Exit Status:
    Returns success unless an invalid option is given or ARRAY is readonly or
    not an indexed array.

BASH - Seeking name function then

2 Answers2