Browsing Chinese (Simplified) translation

334.

Return an unsuccessful result.

335.

Runs COMMAND with ARGS ignoring shell functions. If you have a shell
function called `ls', and you wish to call the command `ls', you can
say "command ls". If the -p option is given, a default value is used
for PATH that is guaranteed to find all of the standard utilities. If
the -V or -v option is given, a string is printed describing COMMAND.
The -V option produces a more verbose description.

336.

Declare variables and/or give them attributes. If no NAMEs are
given, then display the values of variables instead. The -p option
will display the attributes and values of each NAME.

The flags are:

-a[tab]to make NAMEs arrays (if supported)
-f[tab]to select from among function names only
-F[tab]to display function names (and line number and source file name if
[tab]debugging) without definitions
-i[tab]to make NAMEs have the `integer' attribute
-r[tab]to make NAMEs readonly
-t[tab]to make NAMEs have the `trace' attribute
-x[tab]to make NAMEs export

Variables with the integer attribute have arithmetic evaluation (see
`let') done when the variable is assigned to.

When displaying values of variables, -f displays a function's name
and definition. The -F option restricts the display to function
name only.

Using `+' instead of `-' turns off the given attribute instead. When
used in a function, makes NAMEs local, as with the `local' command.

337.

Obsolete. See `declare'.

338.

Create a local variable called NAME, and give it VALUE. LOCAL
can only be used within a function; it makes the variable NAME
have a visible scope restricted to that function and its children.

339.

Output the ARGs. If -n is specified, the trailing newline is
suppressed. If the -e option is given, interpretation of the
following backslash-escaped characters is turned on:
[tab]\a[tab]alert (bell)
[tab]\b[tab]backspace
[tab]\c[tab]suppress trailing newline
[tab]\E[tab]escape character
[tab]\f[tab]form feed
[tab]\n[tab]new line
[tab]\r[tab]carriage return
[tab]\t[tab]horizontal tab
[tab]\v[tab]vertical tab
[tab]\\[tab]backslash
[tab]\0nnn[tab]the character whose ASCII code is NNN (octal). NNN can be
[tab][tab]0 to 3 octal digits

You can explicitly turn off the interpretation of the above characters
with the -E option.

340.

Output the ARGs. If -n is specified, the trailing newline is suppressed.

341.

Enable and disable builtin shell commands. This allows
you to use a disk command which has the same name as a shell
builtin without specifying a full pathname. If -n is used, the
NAMEs become disabled; otherwise NAMEs are enabled. For example,
to use the `test' found in $PATH instead of the shell builtin
version, type `enable -n test'. On systems supporting dynamic
loading, the -f option may be used to load new builtins from the
shared object FILENAME. The -d option will delete a builtin
previously loaded with -f. If no non-option names are given, or
the -p option is supplied, a list of builtins is printed. The
-a option means to print every builtin with an indication of whether
or not it is enabled. The -s option restricts the output to the POSIX.2
`special' builtins. The -n option displays a list of all disabled builtins.

342.

Read ARGs as input to the shell and execute the resulting command(s).

343.

Getopts is used by shell procedures to parse positional parameters.

OPTSTRING contains the option letters to be recognized; if a letter
is followed by a colon, the option is expected to have an argument,
which should be separated from it by white space.

Each time it is invoked, getopts will place the next option in the
shell variable $name, initializing name if it does not exist, and
the index of the next argument to be processed into the shell
variable OPTIND. OPTIND is initialized to 1 each time the shell or
a shell script is invoked. When an option requires an argument,
getopts places that argument into the shell variable OPTARG.

getopts reports errors in one of two ways. If the first character
of OPTSTRING is a colon, getopts uses silent error reporting. In
this mode, no error messages are printed. If an invalid option is
seen, getopts places the option character found into OPTARG. If a
required argument is not found, getopts places a ':' into NAME and
sets OPTARG to the option character found. If getopts is not in
silent mode, and an invalid option is seen, getopts places '?' into
NAME and unsets OPTARG. If a required argument is not found, a '?'
is placed in NAME, OPTARG is unset, and a diagnostic message is
printed.

If the shell variable OPTERR has the value 0, getopts disables the
printing of error messages, even if the first character of
OPTSTRING is not a colon. OPTERR has the value 1 by default.

Getopts normally parses the positional parameters ($0 - $9), but if
more arguments are given, they are parsed instead.