Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

Re: Checking file for a set of strings

by vladb (Vicar)
on May 02, 2003 at 00:29 UTC ( #254858=note: print w/replies, xml ) Need Help??


in reply to Checking file for a set of strings

You are correct, a hash could be used to track number of occurrances of a given line in a file. I construct my hash from an initial array of all the lines you'd like to be present in the file and go from there.
use strict; # more lines could be added to this list my @lines = ("set CMP_DATA_INBND_DIR=C:\\h\\csscs\\data\\commi\\tmp_qu +eue", "set CMP_DATA_OUTBND_DIR=C:\\h\\CMP\\data\\outbound", "set JAVA_HOME=C:\\h\\COTS\\JAVA2\\1.3", "set CSSCS_DATA=C:\\h\\csscs\\data"); # construct a hash of initial line count # e.g. # ( # lineA => 0, # lineB => 0 # ... # ) my %lines = map { $_ => 0 } @lines; my $file = shift or die "Input file argument missing!\n"; my $outfile = shift; # determine default output file name if not specified by the user. $outfile ||= "$file.out"; open (IN, "<$file") or die "Failed to open file $file!\n"; open (OUT, ">$outfile") or die "Failed to open file $outfile!\n"; while (<IN>) { chomp; # increment line count if present in the file $lines{$_}++ if exists $lines{$_}; # for now just print back to the output file print OUT "$_\n"; } for (keys %lines) { # print lines that were missed from the input file # (count 0) print OUT $_ . "\n" unless $lines{$_}; } close(IN); close(OUT);
Sample input file:
set FOO=BAR set CMP_DATA_INBND_DIR=C:\h\csscs\data\commi\tmp_queue set BAR=FOO set CSSCS_DATA=C:\h\csscs\data
And output file generated by the script:
set FOO=BAR set CMP_DATA_INBND_DIR=C:\h\csscs\data\commi\tmp_queue set BAR=FOO set CSSCS_DATA=C:\h\csscs\data set CMP_DATA_OUTBND_DIR=C:\h\CMP\data\outbound set JAVA_HOME=C:\h\COTS\JAVA2\1.3


update: added some badly needed comments..

_____________________
# Under Construction

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://254858]
help
Chatterbox?
[Cosmic37]: Permissions are interesting earthlings. Did nature determine who gives permission and who asks permission. Who was the first to get permission? Are you not related to them as one big earthling family?
[karlgoethebier]: Cojones! We need cojones!
[karlgoethebier]: Ouch! Permissions! We need permissions!
[BarApp]: I can not use modules. I gain temporary access and still can not use modules.
[Cosmic37]: ta erix - this szabo geezer is pretty cool methinks and he writes about undef but I cannot see instructions for redefining the record separator after having undefined it
[Corion]: $/ = "wahtever";
[Corion]: (it's a magic variable)

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (7)
As of 2017-06-29 16:42 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    How many monitors do you use while coding?















    Results (672 votes). Check out past polls.