uk.ac.starlink.topcat.func

Class System

java.lang.Object

uk.ac.starlink.topcat.func.System

public class System
extends Object

Functions for executing shell commands on the local operating system and other system-level operations.

Since:

8 Jun 2005

Author:

Mark Taylor (Starlink)

Method Summary

Modifier and Type	Method and Description
static String	exec(Object... words) Executes an operating system command composed of a command and one or more arguments.
static String	exec(String line) Executes a string as an operating system command.
static void	sleep(int secs) Waits for a specified number of seconds.
static void	sleepMillis(int millis) Waits for a specified number of milliseconds.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

exec

public static String exec(Object... words)

Executes an operating system command composed of a command and one or more arguments.

Each of the words values is treated as a single (possibly quoted) word in a shell command. The first argument is the filename (either a full pathname, or the name of a file on the current path) of an executable file. These values can be numeric, or strings, or something else, and are converted automatically to string values.

Parameters:

words - one or more words composing a shell command; first is command and others are arguments

Returns:

short report message

Examples:

exec("/home/mbt/bin/process_obj.py", OBJ_NAME), exec("process_skycoords.py", RA, DEC), exec("process_sphericalcoords.sh", RA, DEC, 1.0)

exec

public static String exec(String line)

Executes a string as an operating system command. Any spaces in the string are taken to delimit words (the first word is the name of the command).

Parameters:

line - command line to execute

Returns:

short report message

Examples:

exec("do_stuff.py " + RA + " " + DEC)

sleepMillis

public static void sleepMillis(int millis)

Waits for a specified number of milliseconds.

Parameters:

millis - number of milliseconds to wait

sleep

public static void sleep(int secs)

Waits for a specified number of seconds.

Parameters:

secs - number of seconds to wait