9.9 Eneo

9.9 Eneo

The eneo command takes one filename argument. If the file

does not exist, no action is taken. If the file does exist, it is

Tutorial

deleted. In both cases success status is returned. However, if the

file exists and cannot be deleted, eneo returns severe status.

Developer

Syntax  : eneo = "eneo" s filename

Reference

Examples: eneo result.out

1 Introduction

The eneo command was added so as to allow regression testing

2 Interface

scripts to ensure that existing output files were not present

3 Scanner

before proceeding with a test run. If FunnelWeb were to fail to

4 Parser

generate an output file, it would be extremely undesirable for

5 Analyser

the old version to be used.

6 Tangle

ENEO stands for 

E

stablish the 

N

on 

E

xistence 

O

f. Most

7 Weave

operating systems provide a command to delete files. Typically

8 Shell

these commands are verbs such as "delete", "remove", and

9 Commands

"kill". As a consequence, the designers of delete commands

10 Glossary

usually consider the command to have failed if it fails to find

11 References

the file to be deleted. However, in scripts, the delete command

is very commonly used to 

establish the non existence of

  one or

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more files. Typically, a script is starting up and needs to clear

the air before getting started. If the files are there, they should

be deleted; if they are not, then that s OK too. (Note: As far as I

know, the eneo command is original).

Webmaster

Copyright   Ross N. Williams 1992,1999. All rights

reserved.

http://www.ross.net/funnelweb/reference/commands_eneo.html [3/3/2000 10:44:47 PM]