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Top Forums UNIX for Advanced & Expert Users same file being opened by two users at a time Post 302272858 by methyl on Thursday 1st of January 2009 10:25:31 AM
Old 01-01-2009
In addition to cjcox advice.

You could intercept the editor and script a flag file to show that the file is being edited and then stop edits if the flag file exists. The flag method used by unix command "vipw" to prevent two "vipw" users editing the password file at the same time.

Depending on how the file is being edited you may find unix command "fuser" useful. It is however no good for editor processes which don't open the file for write (e.g. vi).
 

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edquota(8)						      System Manager's Manual							edquota(8)

Name
       edquota - edit user quotas

Syntax
       edquota [ -p proto-user ] users...

Description
       The  command  is  a quota editor.  You can specify one or more users on the command line.  For each user, creates  a temporary file with an
       ASCII representation of the current disc quotas for that user and an editor is then invoked on the file.  You can then modify  the  quotas,
       add new quotas, and so forth.  Upon leaving the editor, reads the temporary file and modifies the binary quota files to reflect the changes
       made.

       If a valid quota file does not exist, refers the user to The user then has the option of either supplying the command  which  automatically
       creates the necessary quota file, or creating an empty quota file by various other means.

       If  the	option	is specified, duplicates for each user, the quotas of the prototypical user specified. This is the usual mechanism used to
       initialize quotas for groups of users.

       The editor invoked is unless the environment variable EDITOR specifies otherwise.

       Only the superuser can edit quotas.

Diagnostics
       Various messages about inaccessible files. Other messages are self-explanatory.

Files
       quotas	      At the root of each file system with quotas

       Used to find file system names and locations

See Also
       quota(1), quota(2), quotacheck(8), quotaon(8), repquota(8)
       ``Disk Quotas in a UNIX Environment,'' ULTRIX Supplementary Documents, Volume 3: System Manager

																	edquota(8)
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