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Top Forums Shell Programming and Scripting PERL: removing blank lines from multiple files Post 302354673 by hcclnoodles on Saturday 19th of September 2009 10:11:42 AM
Old 09-19-2009
PERL: removing blank lines from multiple files

Hi Guru's , I have a whole bunch of files in /var/tmp that i need to strip any blank lines from, so ive written the following script to identify the lines (which works perfectly).. but i wanted to know, how can I actually strip the identified lines from the actual source files ??





Code:
	my @all = qx{ls /var/tmp}; # perform an ls on the folder
	
	foreach (@all) {
				
		open(IN, "/var/tmp/$_");
			chomp(my $file = $_);
			my $counter = "0";
			while  (<IN>) {
				$counter++;
				if ($_ =~ /^$/) {
				  print "blank line found in $file at line number $counter\n";
                                  #something here to go and fix it in the actual file ?
				}
			}
		close(IN);
	}

Any help or advice on this would be greatly appreciated
 

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

NAME
inncheck - check inn configuration and database files. SYNOPSIS
inncheck [ -a ] [ -v ] [ -pedantic ] [ -f ] [ -perm ] [ -noperm ] [ file=value | file ] DESCRIPTION
Inncheck examines various configuration files and databases and verifies things about them. Things verified depend on the file being checked, but generally are things like permissions, ownership, syntax errors in config files, etc. Inncheck does not make changes to any files -- it just reports what it thinks may be wrong, and it is up to the operator to fix the prob- lem. The set of files checked may be restricted by using file or file=value arguments. For example, putting incoming.conf causes only the incom- ing.conf file to be checked. Using incoming.conf=/tmp/incoming.conf on the command line will cause inncheck to only verify the incom- ing.conf file, and it will perform the checks on the file /tmp/incoming.conf file instead of the default one. Valid values for file are: active control.ctl expire.ctl incoming.conf inn.conf moderators newsfeeds nntpsend.ctl passwd.nntp readers.conf OPTIONS
-a If any ``file'' value or ``file=value'' pairs (see below) are given, then normally only the files they refer to are checked. Use the ``-a'' flag to specify that all files should be checked regardless. In this case the form file=value will be the more useful. -v Use the ``-v'' option to get more verbose output. -pedantic Use the ``-pedantic'' option to get reports on things that are not necessarily wrong, but may indicate a bad configuration -- such as inn.conf missing a key. -f Use the ``-f'' flag to have inncheck print the appropriate chown/chgrp/chmod command necessary to fix a problem that it reports. Any other output lines will be prefixed with a ``#'' character to make the output be valid input for a shell. Note that the ``-perm'' flag must be used as well when using this flag. -perm Inncheck checks all files for permission problems. If the ``-perm'' flag is used, then only the files specified by the file or file=value command line arguments will be checked for problems other than permission problems. -noperm To avoid doing any checking of file permissions or ownership, use the ``-noperm'' option. EXAMPLES
To have inncheck check all files for syntax and permission problems simply: inncheck To have inncheck check all files for permission problems and to verify the syntax of the active and incoming.conf files do: inncheck -perm active incoming.conf To fix the permissions problems noted in the output of the above command, modify it as follow: inncheck -f -perm | sh To have inncheck check the test newsfeeds file in /var/tmp/newsfeeds.testing, do: inncheck newsfeeds=/var/tmp/newsfeeds.testing To have inncheck check all the files as it normally does, but to specify a different location for the newsfeeds file, so: inncheck -a newsfeeds=/var/tmp/newsfeeds.testing BUGS
If the ``-f'' and ``-perm'' options are used together, along with ``-a'' or some ``file'' or ``file=value'' arguments that refer to a file with a syntax problem, then the output will no longer be valid input for a shell. HISTORY
Written by Brendan Kehoe <brendan@cygnus.com> and Rich Salz <rsalz@uunet.uu.net> This is revision 8409, dated 2009-04-11. SEE ALSO
active(5), expire.ctl(5), history(5), incoming.conf(5), inn.conf(5), newsfeeds(5) INNCHECK(8)
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