Dear all.. I'm very new to perl script, I'm able to read input from a file, and split them into column. The problem is I've no idea how compare line 1 and line 2 variable. For example : 
scf7180000168636        1       40919   40986   Pseudo  TGT     0     
+  0       25.93
scf7180000168636        2       28112   28037   Asn     GTT     0     
+  0       86.57
scf7180000168636        3       27372   27295   Ile     GAT     0     
+  0       54.85
scf7180000168636        4       27287   27213   Gly     TCC     0     
+  0       45.71
scf7180000168636        5       839     753     Leu     CAG     0     
+  0       72.78
scf7180000168667        1       1672    1598    Arg     CCT     0     
+  0       72.32
scf7180000168683        1       509     584     Met     CAT     0     
+  0       90.27
scf7180000168700        1       1405    1329    Val     GAC     0     
+  0       91.08
scf7180000168709        1       11151   11067   Leu     CAA     0     
+  0       75.09
scf7180000168716        1       481     406     Thr     TGT     0     
+  0       81.30
scf7180000168723        1       999     923     Val     GAC     0     
+  0       90.22
scf7180000168736        1       813     888     Val     TAC     0     
+  0       93.03
scf7180000168736        2       912     988     Asp     GTC     0     
+  0       95.34
scf7180000168827        1       5375    5451    Val     GAC     0     
+  0       91.08

[download]
I know how to compare the value for each of the variable horizontally, but what if i want to compare something from line 1 and line 2? My current code : 
#!/usr/local/bin/perl -w
#tRANSCAN-SE_extract
die "usage: $0 tRNASCAN-SE.list\n" unless @ARGV ==1;
while (<>) {
    my ($seq, $tRNA_no, $p1, $p2, $amino, $anticodon, $stat1, $stat2, 
+$percent) = split;
    $beg = $p1 if $p2 > $p1; 
    $beg = $p2 if $p2 < $p1;
    $end = $p1 if $p1 > $p2; 
    $end = $p2 if $p1 < $p2;
        system ("extractseq -sequence=$seq.seq -auto -stdout -separate
+ -reg=$beg..$end");
    }

[download]
I can print out line by line. By how can I print out only $p1 and $p2 if the $seq is the same? Something like "$seq $beg..$end,$beg..$end..." ? Thanks in advanced for helping me...tq!

In reply to Perl Multiline Regex by joomanji

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