RESULTADOS

matter how expert, who knows them all! _{To get you started,} we will

describe a few particularly important ones. We did not have you copy

all of them from the HZ-COM _{working disk (p.} 8) _{into your} AO: _directory.

You can either copy them now or run them from the work disk.

4.3.1

ARUNZ

A Z-System alias or alias script isa_{sequence of one or more commands}

that can be invoked by a single name. As we _{saw in Section} 3.1 (p. 13),

stand-alone _{aliases are short} COX _{fijes that, can be created by SALIAS,}

the screen oriented alias editor.

ARUNZ provides an alternative _{way to define and} use aliases. Instead

of making _{each alias its own file,} ARUNZ _allows one _{to define numerous}

aliases in a single file called ALIAS .CMD. The ARUNZ _{program extracts} a

designated alias script from the ALIAS.CHO _{file, expands any symbolic}

parameters in the script, and passes the resulting command line to the

command _processor.

The ALIAS .CMD file isan ordinary text file that is _{created with any text}

editor _{or wordprocessor} (in non-document mode). Since all the scripts are combined in a single file, they require very little disk space. As a

result, you can easily have dozens or even hundreds of them, and they can greatly enhance and ease _{your computing} life.

ARUNZ _{aliases are invoked by a command of the form:} ARUNZ ALIASNAME C0MMAND-ARGUMENTS< _cr>

ALIASNAME _{specifies which of the scripts in ALIAS} .CMD _{to use, and} COWAND-ARGUMENTS _{supplies other information needed bji the scripts,}

such as fije names. The rea) power of ARUNZ _{comes when}

it

is renamed

to CMDRUN .COM _{and serves as the extended command}

processor (see p. 26). Then the command can be issued simply as:

ALIASNAME CC)MMAND-ARGUMENTS<cr>

An example might make this clearer. One line in the ALIAS.CKD _file

reads:

This may look rather forbidding with all thEe dollar signs, but, when

we take

it

apart piece by piece,

_it

won't be _{so bad. First of all, the}

name of the alias is either "D" or "SO". ARUKZ allows multiple _names to be assigned to a single script. The program run by this alias is SDZ,

the super-directory _program.

The interesting _{part of this script is the way the command arguments} are handled. To illustrate what happens, let's assume that we entered

the following command:

D _S.C<cr>

The parameter expression "$td1" _{means the drive specified in the first} token. In our example, the first token is "S _{.C". Sincewe did not specify} a drive in that token, the current drive, A, is assumed. Similarly,

"$tu1" _{means the user number} specified in the first token. Again, none was given, so the current user number, O, is assumed. Next we

have a colon. So far the command line reads: "SDZ AO:

".

The next parameter, "$tn1" indicates _{the file name part of the first} token. _{In our example, this} is _{"S". The next characters in the script} are _{an asterisk and then} a period. Then we have the parameter

"$tt1",

which stands for the file type in the first token, or "C". Then we ha.ve

another asterisk in the script. So _{far the command line reads:} "SDZ

A0:

_S*.C*".

The final part of the script is _{the parameter expression "$-1". This}

means the entire command argument less _{the first token ("$-2" would}

omit the first two tokens). In the example, _{there are no other tokens,} but one might have used an option to SDZ such as

"le"

to get the file size as a record count instead of in kilobytes. Thus the command entered as

D _S.C<cr>

has become, courtesy of ARUNZ, SDZ _{A0: S*.C* <cr>}

Try entering the alias command and see what happens. The script gives us a _{very convenient way of automatically} making the file specification

to the SDZ _{program into a wildcard specification, saving us the nuisance}

4.3. OTHER Z-SYSTEM TOOLS 35

whose name starts with "S" and whose type starts with "C", including SALIAS.COM, STARTZCM .COM, _and SDZ .COM.

To learn more about how to write and use ARUNZ aliases, consult the references in the Bibliography. But note that the version of ARUNZ

included with nz-cox is

more recent than the one described in the reference there. Many _{new parameters} have been added, and a few

old parameters have been changed. So _{read the update documentation}

provided with the NZ-COM _package.

4.3.2

HELP

Most of the Z-Tools will provide a terse reminder of their command line syntax

if

you enter them with just a double slash, as in

NZCOK

//<

cr>

Much _{more complete} on-line information _can be _{obtained using the}

Z-System HELP _utility.

_It

_provides

an organized method (tree struc- tured) _{for searching special text files with} a file type of HLP and dis-

playing the information _{in them. You run} HELP _{as follows:}

HELP< cr>

HELP

_filename<cr>

The first form uses a file with the name HELP .HLP; the second form uses _{one with} the name

"f

lléname .HLP". For example,

_if

_{you want} help with

_salias

and there isa help file for it, enter the command

HELP _SALIAS<cr>

Help files for a number of other Z-System _{programs can} be found on

the Z-Nodes. _{You can also write your own} HLP _files.

4.3.3

_Library

Tools

Z-System library _{tools allow you to put an entire set of files into} a

single library file and then access the individual members of the library as needed. This is efTective for keeping short and related files organized

and JetLDR are able to access multiple members of a Jibrary more

rapidly than individual files could be _{read Libraries}

are also widely used on remote access CP/M systems (RASS

or RCPMS). The essential

NZ-COM _{system files, for example,} are all kept in XZCOM. LBR.

The two multi-purpose library tools are NULU (new library utility) and VLU _{(visual library utility). These two programs can create a library,}

insert and extract _{files, type files to the screen, and} a host of other

functions. NULU _{is a generic} CP/IC

program readily available from RASs;

VLU _{is a Z-System-specific tool and works somewhat like the ZFILER}

shell. We have included

_it

with the NZ-COM package. Library tools that perform _{more limited} functions are:

LPUT _{put files int.o a library} LGET _{get files out of a library}

LDIR display the directory of a library LX _{extract, and execute a member}

LT display a member (library type)

4.3.4

File Compression

Text compression and decompression tools allow files to be _"crunched"

to a fraction of their original size for more compact storage and faster

transmission by modem. Crunched files have a "Z" as the second letter

oftheirñle

type (or afiletyµeofZZZiftheoriginalfi1e had nofiletype at all). CRUNCH and UNCR do the job. We have provided them with the

NZ-COM package. LT.COM is _{quite versatile.}

It

was listed with the library tools because

it

can display text in library member file.

It

can also display individual

files, and in both cases the file can be crunched as well as normal text.

It

even figures out automatically whether uncrunching is needed. To type a library member to the screen, use the following command form:

LT LBRNAME _{FILENAME.TYP< cr>}

To display an individual file, use the form:

4.3. OTHER Z-SYSTEM TOOLS 37

4.3.5

Named Directory

Tools

The ability _{of Z-System to associate names with directories can make} life easier, especially when the computer has _{a hard disk. editndr6} is a tool for editing the assignment of directory _names.

It

_{can be used}

in either interactive _{mode or from the command line.} Let's use

it

interactively first. Enter the command EDITNDR< cr>

You will get a prompt inviting _{you to enter "?"} for help. Why not accept the invitation! Now try entering a carriage return. EDITNDR will

now show you the names that, are currently assigned. Now enter the line

A1: TEXT<cr>

This will assign the name TEXT _{to user area} 1_{on drive A. Press <}CF> _to see the new listing. You may not, notice the assignment for Al: because

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