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546.

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

Arguments:
ARRAY[tab][tab]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.