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503.

until COMMANDS; do COMMANDS-2; done

555.

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. By default, the backslash character escapes delimiter characters
and newline.

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
-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.

579.

Execute commands as long as a test succeeds.

Expand and execute COMMANDS-2 as long as the final command in COMMANDS has
an exit status of zero.

Exit Status:
Returns the status of the last command executed.

580.

Execute commands as long as a test does not succeed.

Expand and execute COMMANDS-2 as long as the final command in COMMANDS has
an exit status which is not zero.

Exit Status:
Returns the status of the last command executed.

592.

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),
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
%Q[tab]like %q, but apply any precision to the unquoted argument before
[tab][tab]quoting
%(fmt)T[tab]output the date-time string resulting from using FMT as a format
[tab] string for strftime(3)

The format is re-used as necessary to consume all of the arguments. If
there are fewer arguments than the format requires, extra format
specifications behave as if a zero value or null string, as appropriate,
had been supplied.

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