The prompt is displayed only if input is coming from a terminal. The format is a character string which contains three types of objects: Specify the number of lines read between each call to callback. The return value is zero on success, non-zero on failure. Delimiter characters encountered in the input are not treated specially and do not cause read to return until nchars characters are read. All elements are removed from aname before the assignment. If no argument is specified, conversion behaves as if -1 had been given. The exit status is zero, unless end-of-file is encountered, read times out in which case the status is greater than , a variable assignment error such as assigning to a readonly variable occurs, or an invalid file descriptor is supplied as the argument to -u Options, if supplied, have the following meanings: Other name arguments are ignored. Readline uses the current or default, if line editing was not previously active editing settings.
Other name arguments are ignored. If read times out, read saves any partial input read into the specified variable name. Delimiter characters encountered in the input are not treated specially and do not cause read to return until nchars characters are read. The format is a character string which contains three types of objects: 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 input is coming from a terminal, characters are not echoed. The exit status is greater than if the timeout is exceeded. In addition to the standard printf 1 formats, printf interprets the following extensions: In particular, a backslash-newline pair may not be used as a line continuation. All elements are removed from aname before the assignment. If timeout is 0, read returns immediately, without trying to read and data. If there are fewer words read from the input stream than names, the remaining names are assigned empty values. Readline uses the current or default, if line editing was not previously active editing settings. If there are more words than names, the remaining words and their intervening delimiters are assigned to the last name. The result is not split on the characters in IFS; the intent is that the variable is assigned exactly the characters read with the exception of backslash; see the -r option below. The return value is zero on success, non-zero on failure. If no argument is specified, conversion behaves as if -1 had been given. The prompt is displayed only if input is coming from a terminal. The exit status is 0 if input is available on the specified file descriptor, non-zero otherwise. This option is only effective if read is reading input from a terminal, pipe, or other special file; it has no effect when reading from regular files. Arguments to non-string format specifiers are treated as C language constants, except that a leading plus or minus sign is allowed, and if the leading character is a single or double quote, the value is the ASCII value of the following character. If is specified without -c , the default quantum is The backslash is considered to be part of the line. The characters in the value of the IFS variable are used to split the line into words using the same rules the shell uses for expansion described above in Word Splitting. The format is reused as necessary to consume all of the arguments. The corresponding argument is an integer representing the number of seconds since the epoch.
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