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542.

Formats and prints ARGUMENTS under control of the FORMAT.

Options:
-v var[tab]assign the output to shell variable VAR rather than
[tab][tab]display it on the standard output

FORMAT is a character string which contains three types of objects: plain
characters, which are simply copied to standard output; character escape
sequences, which are converted and copied to the standard output; and
format specifications, each of which causes printing of the next successive
argument.

In addition to the standard format specifications described in printf(1)
and printf(3), printf interprets:

%b[tab]expand backslash escape sequences in the corresponding argument
%q[tab]quote the argument in a way that can be reused as shell input
%(fmt)T output the date-time string resulting from using FMT as a format
string for strftime(3)

Exit Status:
Returns success unless an invalid option is given or a write or assignment
error occurs.

543.

Specify how arguments are to be completed by Readline.

For each NAME, specify how arguments are to be completed. If no options
are supplied, existing completion specifications are printed in a way that
allows them to be reused as input.

Options:
-p[tab]print existing completion specifications in a reusable format
-r[tab]remove a completion specification for each NAME, or, if no
[tab]NAMEs are supplied, all completion specifications
-D[tab]apply the completions and actions as the default for commands
[tab]without any specific completion defined
-E[tab]apply the completions and actions to "empty" commands --
[tab]completion attempted on a blank line

When completion is attempted, the actions are applied in the order the
uppercase-letter options are listed above. The -D option takes
precedence over -E.

Exit Status:
Returns success unless an invalid option is supplied or an error occurs.

544.

Display possible completions depending on the options.

Intended to be used from within a shell function generating possible
completions. If the optional WORD argument is supplied, matches against
WORD are generated.

Exit Status:
Returns success unless an invalid option is supplied or an error occurs.

545.

Modify or display completion options.

Modify the completion options for each NAME, or, if no NAMEs are supplied,
the completion currently being executed. If no OPTIONs are given, print
the completion options for each NAME or the current completion specification.

Options:
[tab]-o option[tab]Set completion option OPTION for each NAME
[tab]-D[tab][tab]Change options for the "default" command completion
[tab]-E[tab][tab]Change options for the "empty" command completion

Using `+o' instead of `-o' turns off the specified option.

Arguments:

Each NAME refers to a command for which a completion specification must
have previously been defined using the `complete' builtin. If no NAMEs
are supplied, compopt must be called by a function currently generating
completions, and the options for that currently-executing completion
generator are modified.

Exit Status:
Returns success unless an invalid option is supplied or NAME does not
have a completion specification defined.

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.

547.

Read lines from a file into an array variable.

A synonym for `mapfile'.