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Re: Need a little help appending lines

by johngg (Canon)
on Sep 11, 2007 at 21:31 UTC ( [id://638439]=note: print w/replies, xml ) Need Help??

in reply to Need a little help appending lines

Without seeing your "somefile.txt" I'm not sure what you are doing to get your $word. Certainly, the second chomp is superfluous as you can't remove the line terminator twice. My code below is the equivalent of yours except that I don't do the final chop as I can't tell whether it was necessary; it's easy enough to add back in. I perform the parsing of "somefile.txt" in a BEGIN {...} block before going on to append to the lines in the "address" file.

moritz points out that it can be a bad idea to edit a file in place. Perl does, however, have a handy -i flag for in-place editing which, if given an extension, will preserve your original file with that extension, the modified file taking the original name. Given a spurious "tcp" file and an "address" file

$ cat spw638403.txt aajkaj XYZtcpHJHKtcpKJHKH ashhgdasjh JKHKJHtcpUUHtcpHDKJHtcpJHDJAHD kjkjn NHYtcpHHGJJH $ cat spw638403.addr Address1= Address2= Address3= $

running this code (note the -i.bak flag

#!/usr/bin/perl -i.bak # use strict; use warnings; my @list = (); BEGIN { my $inFile = q{spw638403.txt}; open my $inFH, q{<}, $inFile or die qq{open: $inFile: $!\n}; while ( <$inFH> ) { chomp; push @list, ( split m{tcp}, ( split )[1] )[0]; } close $inFH or die qq{close: $inFile: $!\n}; } while ( <> ) { s{$}{$list[$. - 1]}; print; }

with the address file as the argument results in the original file preserved as spw638403.addr.bak and the modified file as spw638403.addr

$ ./spw638403 spw638403.addr $ cat spw638403.addr Address1=XYZ Address2=JKHKJH Address3=NHY $

I hope this is of use.



Update: Clarified point that the scripts needs the name of the file to be modified as an argument.

Update 2: Corrected senior moment with flag. It is, of course, the -i flag, not -p

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