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534.

Display or manipulate the history list.

Display the history list with line numbers, prefixing each modified
entry with a `*'. An argument of N lists only the last N entries.

Options:
-c[tab]clear the history list by deleting all of the entries
-d offset[tab]delete the history entry at position OFFSET.

-a[tab]append history lines from this session to the history file
-n[tab]read all history lines not already read from the history file
[tab][tab]and append them to the history list
-r[tab]read the history file and append the contents to the history
[tab][tab]list
-w[tab]write the current history to the history file

-p[tab]perform history expansion on each ARG and display the result
[tab][tab]without storing it in the history list
-s[tab]append the ARGs to the history list as a single entry

If FILENAME is given, it is used as the history file. Otherwise,
if HISTFILE has a value, that is used, else ~/.bash_history.

If the HISTTIMEFORMAT variable is set and not null, its value is used
as a format string for strftime(3) to print the time stamp associated
with each displayed history entry. No time stamps are printed otherwise.

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

539.

Read a line from the standard input and split it into fields.

Reads a single line from the standard input, or from file descriptor FD
if the -u option is supplied. The line is split into fields as with word
splitting, and the first word is assigned to the first NAME, the second
word to the second NAME, and so on, with any leftover words assigned to
the last NAME. Only the characters found in $IFS are recognized as word
delimiters.

If no NAMEs are supplied, the line read is stored in the REPLY variable.

Options:
-a array[tab]assign the words read to sequential indices of the array
[tab][tab]variable ARRAY, starting at zero
-d delim[tab]continue until the first character of DELIM is read, rather
[tab][tab]than newline
-e[tab]use Readline to obtain the line in an interactive shell
-i text[tab]use TEXT as the initial text for Readline
-n nchars[tab]return after reading NCHARS characters rather than waiting
[tab][tab]for a newline, but honor a delimiter if fewer than
[tab][tab]NCHARS characters are read before the delimiter
-N nchars[tab]return only after reading exactly NCHARS characters, unless
[tab][tab]EOF is encountered or read times out, ignoring any
[tab][tab]delimiter
-p prompt[tab]output the string PROMPT without a trailing newline before
[tab][tab]attempting to read
-r[tab]do not allow backslashes to escape any characters
-s[tab]do not echo input coming from a terminal
-t timeout[tab]time out and return failure if a complete line of
[tab][tab]input is not read within TIMEOUT seconds. The value of the
[tab][tab]TMOUT variable is the default timeout. TIMEOUT may be a
[tab][tab]fractional number. If TIMEOUT is 0, read returns
[tab][tab]immediately, without trying to read any data, returning
[tab][tab]success only if input is available on the specified
[tab][tab]file descriptor. The exit status is greater than 128
[tab][tab]if the timeout is exceeded
-u fd[tab]read from file descriptor FD instead of the standard input

Exit Status:
The return code is zero, unless end-of-file is encountered, read times out
(in which case it's greater than 128), a variable assignment error occurs,
or an invalid file descriptor is supplied as the argument to -u.

555.

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 a job specification, waits for all processes
in that job's pipeline.

If the -n option is supplied, waits for the next job to terminate and
returns its exit status.

Exit Status:
Returns the status of the last ID; fails if ID is invalid or an invalid
option is given.

575.

Set and unset shell options.

Change the setting of each shell option OPTNAME. Without any option
arguments, list all shell options with an indication of whether or not each
is set.

Options:
-o[tab]restrict OPTNAMEs to those defined for use with `set -o'
-p[tab]print each shell option with an indication of its status
-q[tab]suppress output
-s[tab]enable (set) each OPTNAME
-u[tab]disable (unset) each OPTNAME

Exit Status:
Returns success if OPTNAME is enabled; fails if an invalid option is
given or OPTNAME is disabled.

577.

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

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.

579.

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.