Help to enchance unix tool..

Nagabhushan · #1 (**permalink**) 12-18-2007

HI friends ,

I was assigned to enhance tool in unix solaris...the tool is totaly developed on shell and perl scripts...

The tool is used to change control files....The users are of certain group..
due to many users some people are changing these control files directly by using editors ....they are not using tool to change control files.

In the tool it has feature that it will not allow multiple user to write at a time.
But other user can change by using editors ...So we need to stop this...

Please help me in this regard....

I thought file locking...but dont know how to implement...

Yogesh Sawant · #2 (**permalink**) 12-18-2007

here is a good starter for you

Nagabhushan · #3 (**permalink**) 12-18-2007

Sorry yaar sawant i have tried but its not working..still the file open with editor.

porter · #4 (**permalink**) 12-18-2007

Quote:

Originally Posted by Nagabhushan

Sorry yaar sawant i have tried but its not working..still the file open with editor.

From the link above...

Quote:

Open files and programs are not automatically locked in UNIX.

If a program does not care about locks it will not abide by them. Locks are an afterthought in UNIX, not fundamental like in Windows NT.

Yogesh Sawant · #5 (**permalink**) 12-18-2007

you probably need make use of fcntl

for example, if you are using Perl, then refer to this

porter · #6 (**permalink**) 12-18-2007

Quote:

Originally Posted by Yogesh Sawant

you probably need make use of fcntl

for example, if you are using Perl, then refer to this

But they don't stop user "joe" using editor "fred" to edit a file and ignore the locks.

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