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Re^2: Pre-process csv files before using

by DrAxeman (Beadle)
on Aug 06, 2005 at 18:40 UTC ( #481531=note: print w/ replies, xml ) Need Help??


in reply to Re: Pre-process csv files before using
in thread Pre-process csv files before using

Is there any way that I can add a line after
<code> shift @cols; <code> That will look at the @cols array and then strip column names that meet a specific regular expression?


Comment on Re^2: Pre-process csv files before using
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Re^3: Pre-process csv files before using
by sk (Curate) on Aug 06, 2005 at 18:51 UTC
    Would something like this do?

    perl -e'@cols =qw (need1 dont1 need2 dont2 need3); for (@cols) { push( +@req,$_) unless /dont.*/;} print join (",",@req),$/;' __END__ need1,need2,need3

    You mentiioned regex so the above should help you. However if the names you want to choose are sent as input then you might want to construct a hash from the list and then drop the ones that should be excluded by checking the hash

    .

      The problem is that I don't nessessarily know what all the column names are. I know that any column that ends with "Bandwidth" or has "MSTCPLoopback" in it I don't want.

      I'm trying to approach this from:
      shift @cols; #Remove the first column for (@cols) { delete $cols[$regex here] }
      Then start my sql stuff.
        You can just grep out the ones you want.
        my @cols = ...; shift @cols; # blindy throw away first column @cols = grep( $_ !~ /(Bandwidth|MSTCPLoopback)$/ , @cols); # exclude +ones ending with "Bandwidth" or "MSTCPLoopback"
        re: your code, note that delete is for hashes .. if you wanted to modify your code, you would use the slice function, but grep is much more powerful and perl-ish.
        I am not going to do Re:Re:Re now as it makes it hard to read. This reply is for this node Re^8: Pre-process csv files before using

        Could you please wrap your column header info inside code tags? Long lines don't wrap otherwise. Thanks!

        #!/usr/bin/perl use strict; use warnings; my $str = <DATA>; my @origcols = split /,/,$str; my @cols = (); foreach (@origcols) { $_ =~ s/\.//g; push ( @cols , $_ ) unless /Bandwidth.*|MSTCPLoop.*/ ; } map {print $_,$/ } @cols; __DATA__ PDHCSV40EasternDaylightTime.240,ERWW.COMMUNITIES.MemoryPagesPER.sec,ER +WWCOMMUNITIESNetwor kInterfaceEthernetAdapterModuleBytesTotalPERsec,ERWWCOMMUNITIESNetwork +InterfaceEthernetAd apterCurrentBandwidth

        Output

        PDHCSV40EasternDaylightTime240 ERWWCOMMUNITIESMemoryPagesPERsec ERWWCOMMUNITIESNetworkInterfaceEthernetAdapterModuleBytesTotalPERsec

        as you could see the periods are gone and no warnings. Also the column with bandwidth is not listd. Can you make sure your origcols array is correctly populated?

        -SK

        The code I gave you above should do what you are looking for.

        perl -e'@cols =qw (field1 fieldband field3 fieldMSTCP okfield5); for ( +@cols) { push(@req,$_) unless /band.*|MSTCP.*/;} print join (",",@req +),$/;' __END__ field1,field3,okfield5

        Here i am excluding names with band and MSTCP field names. Since I don't have any field names I am just hard coding it here

        . -SK

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