a

ksh 实现的基于hpux下的性能数据以及故障的采集程序。可以作为新手练手使用

		     The value of a tracked alias becomes undefined when the
		     value of PATH is reset, but the alias remains tracked.
		     Without the -t option, for each name in the argument
		     list for which no value is given, the name and value of
		     the alias is printed.  The -x option is used to set or
		     print exported aliases.  An exported alias is defined
		     across sub-shell environments.  Alias returns true
		     unless a name is given for which no alias has been
		     defined.

      bg [job ...]   Puts the specified jobs into the background.  The
		     current job is put in the background if job is
		     unspecified.  See Jobs for a description of the format
		     of job.

      % break [n]    Exit from the enclosing for, while, until, or select
		     loop, if any.  If n is specified, break n levels.

      % continue [n] Resume the next iteration of the enclosing for, while,
		     until, or select loop.  If n is specified, resume at
		     the n-th enclosing loop.

      cd [-L|-P] [arg]
      cd old new     This command can take either of two forms.	 In the
		     first form it changes the current directory to arg.  If
		     arg is - the directory is changed to the previous
		     directory.	 The -L option (default) preserves logical
		     naming when treating symbolic links.  cd -L .. moves
		     the current directory one path component closer to the
		     root directory.  The -P option preserves the physical
		     path when treating symbolic links.	 cd -P .. changes
		     the working directory to the parent directory of the
		     current directory.	 The shell parameter HOME is the
		     default arg.  The parameter PWD is set to the current
		     directory.	 The shell parameter CDPATH defines the
		     search path for the directory containing arg.
		     Alternative directory names are separated by a colon
		     (:).  If CDPATH is null or undefined, the default value
		     is the current directory.	Note that the current
		     directory is specified by a null path name which can
		     appear immediately after the equal sign or between the
		     colon delimiters anywhere else in the path list.  If
		     arg begins with a /, the search path is not used.



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		     Otherwise, each directory in the path is searched for
		     arg.  See also cd(1).

		     The second form of cd substitutes the string new for
		     the string old in the current directory name, PWD and
		     tries to change to this new directory.

		     The cd command cannot be executed by rksh.

      echo [arg ...] See echo(1) for usage and description.

      % eval [arg ...]
		     Reads the arguments as input to the shell and executes
		     the resulting command(s).

      % exec [arg ...]
		     Parameter assignments remain in effect after the
		     command completes.	 If arg is given, the command
		     specified by the arguments is executed in place of this
		     shell without creating a new process.  Input/output
		     arguments can appear and affect the current process.
		     If no arguments are given, the effect of this command
		     is to modify file descriptors as prescribed by the
		     input/output redirection list.  In this case, any file
		     descriptor numbers greater than 2 opened with this
		     mechanism are closed when invoking another program.

      % exit [n]     Causes the shell to exit with the exit status specified
		     by n.  If n is omitted, the exit status is that of the
		     last command executed.  An end-of-file also causes the
		     shell to exit, except when a shell has the ignoreeof
		     option set (see set below).

      %% export [name [=value] ...]
		     The given names are marked for automatic export to the
		     environment of subsequently executed commands.

      fc [-eename] [-nlr] [first [last]]
      fc -e - [old=new] [command]
		     In the first form, a range of commands from first to
		     last is selected from the last HISTSIZE commands typed
		     at the terminal.  The arguments first and last can be
		     specified as a number or string.  A given string is
		     used to locate the most recent command.  A negative
		     number is used to offset the current command number.
		     The -l option causes the commands to be listed on
		     standard output.  Otherwise, the editor program ename
		     is invoked on a file containing these keyboard
		     commands.	If ename is not supplied, the value of the
		     parameter FCEDIT (default /usr/bin/ed) is used as the
		     editor.  Once editing has ended, the commands (if any)



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		     are executed.  If last is omitted, only the command
		     specified by first is used.  If first is not specified,
		     the default is the previous command for editing and -16
		     for listing.  The -r option reverses the order of the
		     commands and the -n option suppresses command numbers
		     when listing.  In the latter, the command is re-
		     executed after the substitution old=new is performed.

      fg [job ...]   Brings each job into the foreground in the order
		     specified.	 If no job is specified, the current job is
		     brought into the foreground.  See Jobs for a
		     description of the format of job.

      getopts optstring name [arg ...]
		     Checks arg for legal options.  If arg is omitted, the
		     positional parameters are used.  An option argument
		     begins with a + or a -.  An option not beginning with +
		     or -, or the argument -- ends the options.	 optstring
		     contains the letters that getopts recognizes.  If a
		     letter is followed by a :, that option is expected to
		     have an argument.	The options can be separated from
		     the argument by blanks.

		     getopts places the next option letter it finds inside
		     variable name each time it is invoked with a +
		     preceding it when arg begins with a +.  The index of
		     the next arg is stored in OPTIND.	The option argument,
		     if any, gets stored in OPTARG.

		     A leading : in optstring causes getopts to store the
		     letter of an invalid option in OPTARG, and to set name
		     to ? for an unknown option and to : when a required
		     option is missing.	 Otherwise, getopts prints an error
		     message.  The exit status is non-zero when there are no
		     more options.  See also getopts(1).

      jobs [-lnp] [job ...]
		     Lists information about each given job; or all active
		     jobs if job is omitted.  The -l option lists process
		     ids in addition to the normal information.	 The -n
		     option only displays jobs that have stopped or exited
		     since last notified.  The -p option causes only the
		     process group to be listed.  See Jobs for a description
		     of the format of job.

      kill [-sig] process ...
		     Sends either the TERM (terminate) signal or the
		     specified signal to the specified jobs or processes.
		     Signals are given either by number or name (as given in
		     signal(5), stripped of the prefix SIG).  The signal
		     names are listed by kill -l.  No default exists; merely



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		     typing kill does not affect the current job.  If the
		     signal being sent is TERM (terminate) or HUP (hangup),
		     the job or process is sent a CONT (continue) signal
		     when stopped.  The process argument can be either a
		     process ID or job.	 If the first argument to kill is a
		     negative integer, it is interpreted as a sig argument
		     and not as a process group.  See also kill(1).

      let arg ...    Each arg is a separate arithmetic expression to be
		     evaluated.	 See Arithmetic Evaluation above, for a
		     description of arithmetic expression evaluation.  The
		     exit status is 0 if the value of the last expression is
		     non-zero, and 1 otherwise.

      % newgrp [arg ...]
		     Equivalent to exec newgrp arg ....

      print[-Rnprsu[n]] [arg ...]
		     The shell output mechanism.  With no options or with
		     option - or -- the arguments are printed on standard
		     output as described by echo(1).  Raw mode, -R or -r,
		     ignores the escape conventions of echo.  The -R option
		     prints all subsequent arguments and options other than
		     -n.  The -p option causes the arguments to be written
		     onto the pipe of the process spawned with |& instead of
		     standard output.  The -s option causes the arguments to
		     be written onto the history file instead of standard
		     output.  The -u option can be used to specify a one-
		     digit file descriptor unit number n on which the output
		     is to be placed.  The default is 1.  If the option -n
		     is used, no new-line character is added to the output.

      pwd [-L|-P]    With no arguments prints the current working directory
		     (equivalent to print -r - $PWD).  The -L option
		     (default) preserves the logical meaning of the current
		     directory and -P preserves the physical meaning of the
		     current directory if it is a symbolic link.  See the
		     special cd command, cd(1), ln(1)), and pwd(1).

      read [-prsu[n]] [name] [?prompt] [name ...]
		     The shell input mechanism.	 One line is read and broken
		     up into words using the characters in IFS as
		     separators.  In -r raw mode, \ at the end of a line
		     does not signify line continuation.  The first word is
		     assigned to the first name, the second word to the
		     second name, etc., with remaining words assigned to the
		     last name.	 The -p option causes the input line to be
		     taken from the input pipe of a process spawned by the
		     shell using |&.  If the -s option is present, the input
		     is saved as a command in the history file.	 The option
		     -u can be used to specify a one-digit file descriptor



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		     unit to read from.	 The file descriptor can be opened
		     with the exec special command.  The default value of n
		     is 0.  If name is omitted, REPLY is used as the default
		     name.  The return code is 0, unless an end-of-file is
		     encountered.  An end-of-file with the -p option causes
		     cleanup for this process so that another process can be
		     spawned.  If the first argument contains a ?, the
		     remainder of this word is used as a prompt when the
		     shell is interactive.  If the given file descriptor is
		     open for writing and is a terminal device, the prompt
		     is placed on this unit.  Otherwise the prompt is issued
		     on file descriptor 2.  The return code is 0, unless an
		     end-of-file is encountered.  See also read(1).

      %% readonly [name[=value] ...]
		     The given names are marked read-only and these names
		     cannot be changed by subsequent assignment.

      % return [n]   Causes a shell function to return to the invoking
		     script with the return status specified by n.  If n is
		     omitted, the return status is that of the last command
		     executed.	Only the low 8 bits of n are passed back to
		     the caller.  If return is invoked while not in a
		     function or executing a script by the . (dot) built-in
		     command, it has the same effect as an exit command.

      set [_aefhkmnopstuvx | _o option] ... [ _A name] [arg ...]
		     The following options are used for this command:
			  -A	  Array assignment.  Unset the variable name
				  and assign values sequentially from the
				  list arg.  If +A is used, the variable
				  name is not unset first.
			  -a	  All subsequent defined parameters are
				  automatically exported.
			  -e	  If the shell is non-interactive and if a
				  command fails, execute the ERR trap, if
				  set, and exit immediately.  This mode is
				  disabled while reading profiles.
			  -f	  Disables file name generation.
			  -h	  Each command whose name is an identifier
				  becomes a tracked alias when first
				  encountered.
			  -k	  All parameter assignment arguments (not
				  just those that precede the command name)
				  are placed in the environment for a
				  command.
			  -m	  Background jobs are run in a separate
				  process group and a line is printed upon
				  completion.  The exit status of background
				  jobs is reported in a completion message.
				  This option is turned on automatically for



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				  interactive shells.
			  -n	  Read commands and check them for syntax
				  errors, but do not execute them.  The -n
				  option is ignored for interactive shells.
			  -o	  The -o argument takes any of several
				  option names, but only one option can be
				  specified with each -o option.  If none is
				  supplied, the current option settings are
				  printed.  The -o argument option names
				  fo