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565.

Display information about command type.

For each NAME, indicate how it would be interpreted if used as a
command name.

Options:
-a[tab]display all locations containing an executable named NAME;
[tab][tab]includes aliases, builtins, and functions, if and only if
[tab][tab]the `-p' option is not also used
-f[tab]suppress shell function lookup
-P[tab]force a PATH search for each NAME, even if it is an alias,
[tab][tab]builtin, or function, and returns the name of the disk file
[tab][tab]that would be executed
-p[tab]returns either the name of the disk file that would be executed,
[tab][tab]or nothing if `type -t NAME' would not return `file'
-t[tab]output a single word which is one of `alias', `keyword',
[tab][tab]`function', `builtin', `file' or `', if NAME is an alias,
[tab][tab]shell reserved word, shell function, shell builtin, disk file,
[tab][tab]or not found, respectively

Arguments:
NAME[tab]Command name to be interpreted.

Exit Status:
Returns success if all of the NAMEs are found; fails if any are not found.

566.

Modify shell resource limits.

Provides control over the resources available to the shell and processes
it creates, on systems that allow such control.

Options:
-S[tab]use the `soft' resource limit
-H[tab]use the `hard' resource limit
-a[tab]all current limits are reported
-b[tab]the socket buffer size
-c[tab]the maximum size of core files created
-d[tab]the maximum size of a process's data segment
-e[tab]the maximum scheduling priority (`nice')
-f[tab]the maximum size of files written by the shell and its children
-i[tab]the maximum number of pending signals
-k[tab]the maximum number of kqueues allocated for this process
-l[tab]the maximum size a process may lock into memory
-m[tab]the maximum resident set size
-n[tab]the maximum number of open file descriptors
-p[tab]the pipe buffer size
-q[tab]the maximum number of bytes in POSIX message queues
-r[tab]the maximum real-time scheduling priority
-s[tab]the maximum stack size
-t[tab]the maximum amount of cpu time in seconds
-u[tab]the maximum number of user processes
-v[tab]the size of virtual memory
-x[tab]the maximum number of file locks
-P[tab]the maximum number of pseudoterminals
-R[tab]the maximum time a real-time process can run before blocking
-T[tab]the maximum number of threads

Not all options are available on all platforms.

If LIMIT is given, it is the new value of the specified resource; the
special LIMIT values `soft', `hard', and `unlimited' stand for the
current soft limit, the current hard limit, and no limit, respectively.
Otherwise, the current value of the specified resource is printed. If
no option is given, then -f is assumed.

Values are in 1024-byte increments, except for -t, which is in seconds,
-p, which is in increments of 512 bytes, and -u, which is an unscaled
number of processes.

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

568.

Wait for job completion and return exit status.

Waits for each process identified by an ID, which may be a process ID or a
job specification, and reports its termination status. If ID is not
given, waits for all currently active child processes, and the return
status is zero. If ID is a job specification, waits for all processes
in that job's pipeline.

If the -n option is supplied, waits for a single job from the list of IDs,
or, if no IDs are supplied, for the next job to complete and returns its
exit status.

If the -p option is supplied, the process or job identifier of the job
for which the exit status is returned is assigned to the variable VAR
named by the option argument. The variable will be unset initially, before
any assignment. This is useful only when the -n option is supplied.

If the -f option is supplied, and job control is enabled, waits for the
specified ID to terminate, instead of waiting for it to change status.

Exit Status:
Returns the status of the last ID; fails if ID is invalid or an invalid
option is given, or if -n is supplied and the shell has no unwaited-for
children.

578.

Create a coprocess named NAME.

Execute COMMAND asynchronously, with the standard output and standard
input of the command connected via a pipe to file descriptors assigned
to indices 0 and 1 of an array variable NAME in the executing shell.
The default NAME is "COPROC".

Exit Status:
The coproc command returns an exit status of 0.

581.

Resume job in foreground.

Equivalent to the JOB_SPEC argument to the `fg' command. Resume a
stopped or background job. JOB_SPEC can specify either a job name
or a job number. Following JOB_SPEC with a `&' places the job in
the background, as if the job specification had been supplied as an
argument to `bg'.

Exit Status:
Returns the status of the resumed job.

582.

Evaluate arithmetic expression.

The EXPRESSION is evaluated according to the rules for arithmetic
evaluation. Equivalent to `let "EXPRESSION"'.

Exit Status:
Returns 1 if EXPRESSION evaluates to 0; returns 0 otherwise.

583.

Execute conditional command.

Returns a status of 0 or 1 depending on the evaluation of the conditional
expression EXPRESSION. Expressions are composed of the same primaries used
by the `test' builtin, and may be combined using the following operators:

( EXPRESSION )[tab]Returns the value of EXPRESSION
! EXPRESSION[tab][tab]True if EXPRESSION is false; else false
EXPR1 && EXPR2[tab]True if both EXPR1 and EXPR2 are true; else false
EXPR1 || EXPR2[tab]True if either EXPR1 or EXPR2 is true; else false

When the `==' and `!=' operators are used, the string to the right of
the operator is used as a pattern and pattern matching is performed.
When the `=~' operator is used, the string to the right of the operator
is matched as a regular expression.

The && and || operators do not evaluate EXPR2 if EXPR1 is sufficient to
determine the expression's value.

Exit Status:
0 or 1 depending on value of EXPRESSION.

590.

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][tab]NAMEs are supplied, all completion specifications
-D[tab]apply the completions and actions as the default for commands
[tab][tab]without any specific completion defined
-E[tab]apply the completions and actions to "empty" commands --
[tab][tab]completion attempted on a blank line
-I[tab]apply the completions and actions to the initial (usually the
[tab][tab]command) word

When completion is attempted, the actions are applied in the order the
uppercase-letter options are listed above. If multiple options are supplied,
the -D option takes precedence over -E, and both take precedence over -I.

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

592.

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
[tab]-I[tab][tab]Change options for completion on the initial word

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.

593.

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:
-d delim[tab]Use DELIM to terminate lines, instead of newline
-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]Remove a trailing DELIM from each line read (default newline)
-u fd[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
[tab][tab][tab]CALLBACK

Arguments:
ARRAY[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.