Хорошо, кто бы вас ни учил писать на Perl, ему нужно уйти из девяностых.
#!/usr/bin/perl
use strict; # ALWAYS
use warnings; # Also always.
# When you learn more you can selectively turn off bits of strict and warnings
# functionality on an as needed basis.
use IO::File; # A nice OO module for working with files.
my $file_name = "SampleLogFile.txt"; # note that we have to declare $file now.
my $input_fh = IO::File->new( $file_name, '<' ); # Open the file read-only using IO::File.
# You can avoid assignment through $_ by assigning to a variable, even when you use <$fh>
while( my $line = $input_fh->getline() ) {
# chomp($line); # Chomping is usually a good idea.
# In this case it does nothing but screw up
# your output, so I commented it out.
# This does nothing of the sort:
# Convert the line to upper case.
print "$line" if $line = ~ /sent/;
}
Вы также можете сделать это с одним вкладышем:
perl -pe '$_ = "" unless /sent/;' SampleLogFile.txt
См. perlrun для получения дополнительной информации об однострочниках.