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Top Forums Shell Programming and Scripting Unable to overwrite but can delete file Post 302399733 by savage66 on Monday 1st of March 2010 10:28:42 AM
Old 03-01-2010
Unable to overwrite but can delete file

I'm debugging a ksh script written by someone else that does the following:

It runs a command and redirects stdout to a file called dberror that already exists using ">". This command fails with the following error:

The file access permissions do not allow the specified action.
Code:
dberror: 0403-005 Cannot create the specified file.

The script continues and a couple lines later it deletes the error file like this:
rm -f dberror

The file is successfully deleted but no file permissions are changed in the script.

My question is why the ">" operator can't overwrite the file but the rm -f can delete it? I always thought that anyone who has write permissions on the file could overwrite it with ">".

Last edited by Yogesh Sawant; 03-01-2010 at 01:40 PM.. Reason: added code tags
 

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times(1)							   User Commands							  times(1)

NAME
times - shell built-in function to report time usages of the current shell SYNOPSIS
sh times ksh times DESCRIPTION
sh Print the accumulated user and system times for processes run from the shell. ksh Print the accumulated user and system times for the shell and for processes run from the shell. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), sh(1), time(1), attributes(5) SunOS 5.11 15 Apr 1994 times(1)
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