Windows nt scripting

Using start-index allows multiple switches of the same name to be sequentially processed. The switch index is returned in the RET variable. The value 0 is returned if the switch cannot be located. The value of the switch if any is returned in the RETV variable. These procedures thus provide a way for a script to maintain persistent state information, even across system restarts. Typically, the script uses the script name as the context value.

The variables to save are specified by the prefix argument. The REG command has one undocumented peculiarity. In the value string passed, the backslash character is treated as an escape character to allow special values to be passed.

Therefore, before the variable values are stored in the Registry, each backslash character is converted to a double backslash. The context specifies the context from which to restore the variables. It should be the same context name that was used to store the variables.

To restore an individual variable, specify it using the variable argument. To restore all the variables from a context, omit the variable argument. When restoring a complete context, only variables that are found in the Registry are altered. The output of this command is somewhat verbose, but by filtering the output by a FIND command, only those lines that actually define a variable are isolated.

Double quotes are also removed from the variable values. The context specifies the context from which to delete the variables. To delete an individual variable, specify it using the variable argument. To delete all the variables from a context, omit the variable argument. Since this command prompts for confirmation before proceeding with the delete operation, a temporary file is created containing the needed response, and the console input of the REG command is redirected to this file.

This has the effect of changing the sequence of pseudo-random numbers generated by RAND. Therefore, all this procedure does is assign a new value to this variable. The RAND procedure returns the next pseudo-random number in the pseudo-random sequence used by the generator. These values are between 0 and , inclusive.

The algorithm is fast and simple, and generates numbers with uniform distribution. It should not, however, be used for serious statistical analysis.

The command shell scans all script commands for variable references to expand. However, if the value of a variable that is expanded contains additional variables to expand, these are not expanded. This text can contain any number of variable references each surrounded by percent signs, as usual. In addition, the value of any of these variables can also contain variable references to resolve and so on to any nesting depth.

RESOLVE is particularly useful when variable information must be accessed indirectly for example, when arrays of data are accessed , or a variable name must be composed from fragments and then resolved.

The new text with the variable substitutions made is then stored back into the RET variable, thus resolving one layer of variable indirection. This indicates that no more variable substitution is required. This allows a script to prompt for and receive interactive input. The line is copied to a temporary file, and this file is then parsed by the FOR command to capture the file contents into the RET variable. This is because the FOR command cannot correctly process a file name containing spaces it mistakenly assumes that the spaces separate multiple file names.

Instead, the TYPE command which can correctly handle file names with spaces is used, and its output is parsed. The file name is returned in the RET variable. A slave script typically sets a synchronization file to indicate to a master script s that it has completed processing. Therefore, the procedure simply uses the ECHO command line to output a single period character to the file. The file to delete is specified by the filename argument.

Otherwise, the Windows temporary directory will gradually fill with old synchronization files. The file upon which to wait is specified by the filename argument. The procedure waits for up to timeout seconds the default is 60 seconds before failing with a timeout. The loop and procedure exits as soon as the file exists.

While the file does not exist, the loop continues. Thus, the file is polled every second until it exists. Forcing the script to sleep for one second also yields the CPU while the script is waiting, and the loop thus consumes almost no CPU time while waiting.

Since the loop executes once per second approximately , the timeout code simply counts down until the timeout reaches zero, at which time the loop executes regardless of the state of the synchronization file.

The pseudo-random number uses the same algorithm as the RAND procedure, though it uses an independent seed value. If the TEMP variable exists, it is used as the path name for the file. Otherwise, if the TMP variable exists, it is used as the path name.

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Stats New Riders Rate me:. Please Sign up or sign in to vote. An introduction to the native Windows NT scripting language, including shell command syntax. Building Scripts This chapter provides guidelines for using tools to build scripts, and also provides two complete script skeletons:templates that can be used as starting points for customized scripts. BAT script library source code is presented and described in detail. This library contains many useful procedures that can be accessed directly from custom scripts.

BAT script library. However, certain special script requirements place two specific constraints on this editor: First, some scripts require trailing spaces at the end of a line for example, the PJCOUNT.

BAT script of Chapter 6. Therefore, check that the editor does not automatically strip trailing white space from lines. BAT script of this chapter. Therefore, make sure that any editor you use does not convert tab characters into spaces or vice versa. The Windows Notepad editor correctly handles both trailing spaces and literal tab characters. These can be removed when development is complete.

Add PAUSE commands before a critical part of a script, so that the script can be stopped if something appears to be wrong. Most of these techniques are highlighted in the sample script presented in this chapter.

Standard Script Skeleton Figure 5. BAT to a new script file. Copy Code. A list of licenses authors might use can be found here. New Riders. First Prev Next Fine thing mloibl Feb Kastellanos Nikos Feb Anonymous Jun Kastellanos Nikos 8-Jun John Hamlin 1-Jan Go to top. Layout: fixed fluid. United States. First Prev Next.

Fine thing mloibl Feb Not that I can use these things by not I think its important that a developer is familiar with batch-processing. Is this a joke? Kastellanos Nikos. Does this think really exist?

Re: Is this a joke? Well, at least one uses it - me - for years already and hopefully for years to come If you are administrator you will appreciate the power of these scripts and you can often spare to use Perl. Thanks for remind me.

Batch scripting will outlive us all. The batch interpreter opens the batch file, reads a command line, closes the batch file, and executes the command. Then it reopens the batch file, seeks to the last position, reads a line, closes the batch file and executes.

And so on. That means you can edit a batch while it is running. There are many other scripting languages that are a lot cleaner, safer, more powerful and easier to read Perl, python, PHP, powershell just to name a few. But those are all memory resident. That's the price you pay for a more complex grammar. For some applications, only batch scripting is suitable. Hahaha Feb Now, I known I will not buy the book Re: Hahaha Feb Thats a bit unfair. Tim Hill has written a second book called Windows Windows Script Host, and that's probably what you are looking for.

Establish trust relationships. Manage resource-domain computer accounts by adding, deleting, listing, and querying resource domains. Managing computer accounts is useful for building a list of servers before you run automated administration tasks.

Netdom has one command for BDCs and another command for Member servers. If you want to automate the task, you need to add the computer account for that server and then join the domain. Forcing a shutdown.

Querying and checking on the status of trust. Testing trust relationships and the state of domain controller DC replication in a Windows domain. Forcing a user-account database into sync on Windows NT 4.

Trust describes a relationship between two Windows domains. Each domain in the relationship can become either the trusting domain or the trusted domain. This is an example of a one-way trust.

Trust relationships are not transitive. The administrator in each domain must grant explicit permission on either side of the trust relationship for the relationship to begin. Another form of trust relationship is sometimes referred to as an implicit trust.

In a single domain model or in an environment where there are no explicit trust relationships between any two domains, the implicit trust relationship is functionally needed and active. Explicit trust relationships are established through User Manager For Domains.

Implicit trust relationships are established when a Windows computer becomes a member of a domain. In domains where an explicit trust has been defined, Nltest can test the trust relationship that exists between all domain controllers in the trusting domain and a domain controller in the trusted domain. These sessions of communication are called secure channels.