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Top Forums UNIX for Dummies Questions & Answers Anyone know what if [ -z "${DTS}" ] ; then means Post 302215501 by ggmar on Wednesday 16th of July 2008 01:43:52 PM
Old 07-16-2008
Anyone know what if [ -z "${DTS}" ] ; then means

Does anyone know what the followig if expression means

if [ -z "${DTS}" ] ; then

What is DTS
What is -z
 

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dts_intro(1m)															     dts_intro(1m)

NAME
dts_intro - Introduction to the DCE DTS commands DESCRIPTION
The DCE Distributed Time Service (DTS) provides the following facilities: The dtsd daemon The DTS control program (dtscp) The DTS local clock setting program (dtsdate) The DTS is implemented in the dtsd process. Both clerks and servers use the same daemon. The behavior of the dtsd daemon is determined by the dtscp command. The dtscp control program allows you to synchronize, adjust, and maintain the system clocks in a distributed network. The DTS control pro- gram commands are listed below: The advertise command, which configures the DTS server as a global server The change command, which modi- fies the epoch and sets the local time to a new time The create command, which establishes a DTS entity (a clerk or server) The delete com- mand, which causes DTS to exit on the local node The disable command, which suspends a DTS entity The enable command, which starts a DTS entity The exit command, which ends the dtscp management session and returns you to the system prompt The help command which invokes the dtscp help service. The quit command, which ends the dtscp management session and returns you to the system prompt The set command, which modifies characteristics of a DTS entity The show command, which displays characteristics of a DTS entity The synchronize command, which synchronizes the system clock with the time obtained from DTS servers in the network The unadvertise command, which removes the global server entry The update command, which gradually adjusts the system clock to a new time For more information on any of the above dtscp commands, see the appropriate reference page in this chapter. The dtsd command restarts the DTS daemon (clerk or server process). When the host system is rebooted, this command is automatically exe- cuted as part of the overall DCE configuration procedure. For more information, see the dtsd reference page in this chapter. Invocation of dtsd leaves it in an idle state. In order for it to assume an identity, it must be ``created'' with the dtscp create command. After the DTS entity is created, it is still in a non-functioning state. To put it into operation, you must invoke dtscp enable, which causes an immediate synchronization to take place. For more information, see the enable reference page in this chapter. To bring down a DTS entity, you must first stop it with dtscp disable and then delete it with dtscp delete. For more information, see the disable and delete reference pages in this chapter. The dtsdate command sets the local clock of a system to be the same as the host remote_host, running a dtsd server. For more information see the tsdate reference page in this chapter. RELATED INFORMATION
Command: dtscp(1m) dtsdate(1m) Books: DCE Administration Guide, DCE Administration Reference dts_intro(1m)
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