Login or Register to Ask a Question and Join Our Community

Sponsored Content
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
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

testing if files exist

I am trying to test arguments to see if they are files in any directory. I have : but it's not working (7 Replies)
Discussion started by: skooly5
7 Replies

2. Shell Programming and Scripting

Dealing with log files

Hi , My requirement is that i need to search for a number of strings in a log file and print them with line numbers.The search should be date wise. The sample log file is : Jan 17 02:45:34 srim6165 MQSIv500: (UKBRKR1P_B.LZ_ BENCHMARKS)BIP2648E: Message backed out to a queue; node... (6 Replies)
Discussion started by: charudpss
6 Replies

3. Shell Programming and Scripting

Dealing with files with spaces in the name

Hello, I'm a computer science major and I'm having problems dealing with file names with spaces in them. Particularly I'm saving a file name in a variable and then using the variable in a compare function i.e. a='te xt.txt' b='file2.txt' cmp $a $b If anyone could help me with this particular... (10 Replies)
Discussion started by: jakethegreycat
10 Replies

4. Shell Programming and Scripting

Perl: One action if an element doesn't exist in array

Hello, I want to run one (not multiple) action if an element doesn't exist in array. for example: @array = (1..10); foreach $el (@array) { if ($el != 11) { print "number not found\n"; } } the output of this simple script: number not found (3 Replies)
Discussion started by: ahmed_zaher
3 Replies

5. Shell Programming and Scripting

Check if file .jpg is exist perl

Hi, I just wondering I done program which will list .jpg extension file but if there is not .jpg file in current directory display error how to do it ; here is my code #!/bin/sh echo "Enter a program function :" # declear User input read func1 func2 ## user must input list follow by... (1 Reply)
Discussion started by: guidely
1 Replies

6. Shell Programming and Scripting

Iterating over subdirectories and dealing with files within them

Hello, I am working on a coding project for a class and to test the program I have created, I have come up with 100 different test cases. The program takes four text files as input, so each of the test cases is contained in a folder with four files. I have a folder called 'tests', within which... (1 Reply)
Discussion started by: dpryor
1 Replies

7. UNIX for Dummies Questions & Answers

Dealing with Empty files, AWK and Loops

I write this bit of code to calculate the mean and variance for all the files in one directory and print the mean and variance in a separate folder but with the same file name. FILES="data/*" for X in $FILES do name=$(basename $X) awk '{x=$0; s+=$0; n++} END{mean=s/n; for (i in x){ss... (20 Replies)
Discussion started by: A-V
20 Replies

8. Shell Programming and Scripting

Dealing with multiple files

Korn Shell I have hundreds of small files like below created every day. A midnight cron job moves them to the location /u04/temp/logs But sometimes I have to manually move these files based a certain dates or time. I have two basic requirements 1.Using mv command I want to move all .dat... (2 Replies)
Discussion started by: kraljic
2 Replies

9. Shell Programming and Scripting

Perform an action if certain text exist in output (PERL)

Hello, I'm attempting to write a tool that checks an IP address for existing PTR records then if there are no PTR records does a ping to see if it response. Then if there is no response, it should print a message saying This is what I have so far. #!/usr/bin/perl $nxdomain =... (4 Replies)
Discussion started by: spartan22
4 Replies

10. Shell Programming and Scripting

Dealing with filename spaces in Perl

The following command to replace text in place in multiple files in a directory is tripping up on filename spaces (Windows environment). I really don't know Perl. find '\\server\directory' | xargs perl -pi -e 's/textA/textB/g'Mike (2 Replies)
Discussion started by: Michael Stora
2 Replies

LEARN ABOUT DEBIAN

prename

RENAME(1)						 Perl Programmers Reference Guide						 RENAME(1)

NAME

       rename - renames multiple files

SYNOPSIS

       rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]

DESCRIPTION

       "rename" renames the filenames supplied according to the rule specified as the first argument.  The perlexpr argument is a Perl expression
       which is expected to modify the $_ string in Perl for at least some of the filenames specified.	If a given filename is not modified by the
       expression, it will not be renamed.  If no filenames are given on the command line, filenames will be read via standard input.

       For example, to rename all files matching "*.bak" to strip the extension, you might say

	       rename 's/.bak$//' *.bak

       To translate uppercase names to lower, you'd use

	       rename 'y/A-Z/a-z/' *

OPTIONS

       -v, --verbose
	       Verbose: print names of files successfully renamed.

       -n, --no-act
	       No Action: show what files would have been renamed.

       -f, --force
	       Force: overwrite existing files.

ENVIRONMENT

       No environment variables are used.

AUTHOR

       Larry Wall

SEE ALSO

       mv(1), perl(1)

DIAGNOSTICS

       If you give an invalid Perl expression you'll get a syntax error.

BUGS

       The original "rename" did not check for the existence of target filenames, so had to be used with care.	I hope I've fixed that (Robin
       Barker).

perl v5.14.2							    2014-09-26								 RENAME(1)
All times are GMT -4. The time now is 06:49 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy