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442.

ulimit [-SHacdefilmnpqrstuvx] [limit]

444.

wait [id]

445.

wait [pid]

473.

Set Readline key bindings and variables.

Bind a key sequence to a Readline function or a macro, or set a
Readline variable. The non-option argument syntax is equivalent to
that found in ~/.inputrc, but must be passed as a single argument:
e.g., bind '"\C-x\C-r": re-read-init-file'.

Options:
-m keymap Use KEYMAP as the keymap for the duration of this
command. Acceptable keymap names are emacs,
emacs-standard, emacs-meta, emacs-ctlx, vi, vi-move,
vi-command, and vi-insert.
-l List names of functions.
-P List function names and bindings.
-p List functions and bindings in a form that can be
reused as input.
-S List key sequences that invoke macros and their values
-s List key sequences that invoke macros and their values
in a form that can be reused as input.
-V List variable names and values
-v List variable names and values in a form that can
be reused as input.
-q function-name Query about which keys invoke the named function.
-u function-name Unbind all keys which are bound to the named function.
-r keyseq Remove the binding for KEYSEQ.
-f filename Read key bindings from FILENAME.
-x keyseq:shell-command[tab]Cause SHELL-COMMAND to be executed when
[tab][tab][tab][tab]KEYSEQ is entered.

Exit Status:
bind returns 0 unless an unrecognized option is given or an error occurs.

478.

Change the shell working directory.

Change the current directory to DIR. The default DIR is the value of the
HOME shell variable.

The variable CDPATH defines the search path for the directory containing
DIR. Alternative directory names in CDPATH are separated by a colon (:).
A null directory name is the same as the current directory. If DIR begins
with a slash (/), then CDPATH is not used.

If the directory is not found, and the shell option `cdable_vars' is set,
the word is assumed to be a variable name. If that variable has a value,
its value is used for DIR.

Options:
-L[tab]force symbolic links to be followed
-P[tab]use the physical directory structure without following symbolic
[tab]links
-e[tab]if the -P option is supplied, and the current working directory
[tab]cannot be determined successfully, exit with a non-zero status

The default is to follow symbolic links, as if `-L' were specified.

Exit Status:
Returns 0 if the directory is changed, and if $PWD is set successfully when
-P is used; non-zero otherwise.

484.

Set variable values and attributes.

Declare variables and give them attributes. If no NAMEs are given,
display the attributes and values of all variables.

Options:
-f[tab]restrict action or display to function names and definitions
-F[tab]restrict display to function names only (plus line number and
[tab]source file when debugging)
-g[tab]create global variables when used in a shell function; otherwise
[tab]ignored
-p[tab]display the attributes and value of each NAME

Options which set attributes:
-a[tab]to make NAMEs indexed arrays (if supported)
-A[tab]to make NAMEs associative arrays (if supported)
-i[tab]to make NAMEs have the `integer' attribute
-l[tab]to convert NAMEs to lower case on assignment
-r[tab]to make NAMEs readonly
-t[tab]to make NAMEs have the `trace' attribute
-u[tab]to convert NAMEs to upper case on assignment
-x[tab]to make NAMEs export

Using `+' instead of `-' turns off the given attribute.

Variables with the integer attribute have arithmetic evaluation (see
the `let' command) performed when the variable is assigned a value.

When used in a function, `declare' makes NAMEs local, as with the `local'
command. The `-g' option suppresses this behavior.

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

486.

Define local variables.

Create a local variable called NAME, and give it VALUE. OPTION can
be any option accepted by `declare'.

Local variables can only be used within a function; they are visible
only to the function where they are defined and its children.

Exit Status:
Returns success unless an invalid option is supplied, an error occurs,
or the shell is not executing a function.

487.

Write arguments to the standard output.

Display the ARGs on the standard output followed by a newline.

Options:
-n[tab]do not append a newline
-e[tab]enable interpretation of the following backslash escapes
-E[tab]explicitly suppress interpretation of backslash escapes

`echo' interprets the following backslash-escaped characters:
\a[tab]alert (bell)
\b[tab]backspace
\c[tab]suppress further output
\e[tab]escape character
\f[tab]form feed
\n[tab]new line
\r[tab]carriage return
\t[tab]horizontal tab
\v[tab]vertical tab
\\[tab]backslash
\0nnn[tab]the character whose ASCII code is NNN (octal). NNN can be
[tab]0 to 3 octal digits
\xHH[tab]the eight-bit character whose value is HH (hexadecimal). HH
[tab]can be one or two hex digits

Exit Status:
Returns success unless a write error occurs.

498.

Remember or display program locations.

Determine and remember the full pathname of each command NAME. If
no arguments are given, information about remembered commands is displayed.

Options:
-d[tab][tab]forget the remembered location of each NAME
-l[tab][tab]display in a format that may be reused as input
-p pathname[tab]use PATHNAME is the full pathname of NAME
-r[tab][tab]forget all remembered locations
-t[tab][tab]print the remembered location of each NAME, preceding
[tab][tab]each location with the corresponding NAME if multiple
[tab][tab]NAMEs are given
Arguments:
NAME[tab][tab]Each NAME is searched for in $PATH and added to the list
[tab][tab]of remembered commands.

Exit Status:
Returns success unless NAME is not found or an invalid option is given.

505.

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][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 NCHARS
[tab][tab]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 delimiter
-p prompt[tab]output the string PROMPT without a trailing newline before
[tab][tab]attempting to read
-r[tab][tab]do not allow backslashes to escape any characters
-s[tab][tab]do not echo input coming from a terminal
-t timeout[tab]time out and return failure if a complete line of input is
[tab][tab]not read withint TIMEOUT seconds. The value of the TMOUT
[tab][tab]variable is the default timeout. TIMEOUT may be a
[tab][tab]fractional number. If TIMEOUT is 0, read returns success only
[tab][tab]if input is available on the specified file descriptor. The
[tab][tab]exit status is greater than 128 if the timeout is exceeded
-u fd[tab][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,
or an invalid file descriptor is supplied as the argument to -u.