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Full Discussion: perl: When dealing with files that do not exist
Top Forums Shell Programming and Scripting perl: When dealing with files that do not exist Post 302169232 by joeyg on Wednesday 20th of February 2008 03:03:17 PM
Old 02-20-2008
Question perl: When dealing with files that do not exist
I have a process run weekly where I must convert data formats for about thirty files. I read a text file that provides all of the filenames and switch settings.

My perl code is:

Code:
for ($j = 1; $j <= $k; $j++)
{

   open(FIN2,$fin2) || die "open: $!";

   do other stuff
}

Every once in a while, one of the files is empty, & this is ok.
But the perl program aborts at that open line. Right now, when this happens, I simply remove the file info from the text file listing, and restart. But, I must remember to put the line(s) back in for the next week.

QUESTION:
is it better to do a "next" when the file open fails, or
do some kind of File::stat command to know if the file exists first

In shell scripting, one can do an "if [ -e filename ] " kind of thing
 

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LEARN ABOUT NETBSD

weekly

WEEKLY(5)						      BSD File Formats Manual							 WEEKLY(5)

NAME

     weekly, weekly.conf -- weekly maintenance

DESCRIPTION

     The /etc/weekly script is run, by default, every Saturday morning on a NetBSD system.  The /etc/weekly.conf file specifies which of the stan-
     dard weekly services are performed.

     The variables described below can be set to ``YES'' or ``NO'' in the /etc/weekly.conf file.  The default settings are in the
     /etc/defaults/weekly.conf file.  (Note that you should never edit /etc/defaults/weekly.conf directly, as it is often replaced during system
     upgrades.)

     rebuild_locatedb  This rebuilds the locate(1) database, /var/db/locate.database, which must also exist, in order to be rebuilt.

     rebuild_mandb     This rebuilds the apropos(1) database /var/db/man.db, using makemandb(8) with the -f option.

     rebuild_whatisdb  This rebuilds the whatis(1) database(s).  Note that NetBSD provides a default whatis.db for the system manual pages and
		       this may not be needed.	(Adjust your /etc/man.conf as necessary; see man.conf(5) for details.)

FILES

     /etc/weekly	weekly maintenance script
     /etc/weekly.conf	weekly maintenance configuration
     /etc/weekly.local	local site additions to /etc/weekly

SEE ALSO

     daily.conf(5), monthly.conf(5)

HISTORY

     The /etc/weekly script first appeared in 4.3BSD.  The /etc/weekly.conf configuration file appeared in NetBSD 1.3.

BSD
								   March 6, 2012							       BSD
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