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Top Forums Shell Programming and Scripting PERL: removing blank lines from multiple files Post 302354730 by hcclnoodles on Saturday 19th of September 2009 02:29:18 PM
Old 09-19-2009
Quote:
Originally Posted by durden_tyler
I think Scrutinizer's method is a very simple and elegant way of doing what you want to do.
I fail to understand why you would want to open each file and read it line by line just to remove blank lines.
You have a loaded Uzi and you want to club someone to death with it ?

tyler_durden
Hi Tyler, the files in the /var/tmp folder are generated from another process which has been known (annoyingly) to produce output files with blank lines ..the reason i have to go through each file line by line is because i need to identify exactly which line number in which file is returning blank and send it to a log file. you are right, there is no need for me to actually fix these issues within this actual script but i thought it make sense to do so if possible

I read on another site that I can set my file location within my script to say $file and then run this
Code:
my $file = "/var/tmp/0629AN1208.net";
$file =~ s/^\n//g;

but that doesnt seem to work, whereas if i run the equivalent one liner from the command line (see below) it works perfectly .

Code:
perl -pi -e "s/^\n//" /var/tmp/0629AN1208.net



is there a way to convert that one liner into something I can run within a perl script ?
 

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

NAME
faxcron - HylaFAX routine maintenance script SYNOPSIS
/usr/sbin/faxcron [ -n ] [ -l lastrun ] DESCRIPTION
faxcron is a command script that does routine upkeep tasks in a HylaFAX spooling directory hierarchy. This script is intended to be invoked from cron(8) on behalf of the fax user (often the ``fax'' user is uucp) once a day, with the standard output sent by mail to the HylaFAX administrator. For example, the following crontab might be set up for the fax user: 25 23 * * * sh /usr/sbin/faxcron | mail FaxMaster The faxcron script does the following work: o report statistics for facsimile transmitted since the last time faxcron was run. o report statistics for facsimile transmitted in the past week. o report statistics for facsimile received since the last time faxcron was run. o report statistics for facsimile received in the past week. o report any recent calls that failed suspiciously and return the associated trace log; o purge data that is 30 days or older from the remote machine information directory; o delete information that is 30 days or older from session trace log files; o remove files from the tmp directory that are older than 1 day; o remove files in the received facsimile queue that are 7 days or older; o report sites that are currently having jobs rejected; and o force all session log files to be owned by the fax user and kept with protection mode 644. OPTIONS
-n Forces faxcron to run without updating any files. -l lastrun Forces the notion of the last time that faxcron was run to be lastrun. The value of lastrun is a date and time string of the form ``MM/DD/YY HH:MM'' (the date(1) format string ``%D %H:%M''). -info n Set the expiration time for data in the info database to be n days. -log n Set the expiration time for session log data to be n days. -rcv n Set the expiration time for files in the received facsimile queue to be n days. -tmp n Set the expiration time for files in the tmp directory to be n days. -mode m Set the file protection mode for session logs to m (a command line argument to chmod(1)). NOTES
This script requires nawk(1) or gawk(1) and a date (1) program that supports the ``+format'' option. If session logs are to be kept private this script must be modified to filter out sensitive information such as calling card numbers. (It should also be run with ``-mode 0600'' so that session log files are not publicly readable.) FILES
/var/spool/hylafax spooling area /var/spool/hylafax/status/lastrun timestamp of last run /usr/sbin/xferfaxstats for generating transmit statistics /usr/sbin/recvstats for generating receive statistics /var/spool/hylafax/tmp/faxcronXXXX temporary file for truncating session logs /var/spool/hylafax/tmp/faxlogXXXX temporary file for logs of failed calls SEE ALSO
cron(8), faxq(8), faxgetty(8), faxsend(8), xferfaxstats(8), recvstats(8), hylafax-server(5) May 12, 1996 FAXCRON(8)
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