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perl -i.one -le 'chomp( my @cinfo= <> ); $cinfo[1]=0; print @cinfo' *.
+txt
perl -i.one -e 'my @cinfo= <>; $cinfo[1]= "0\n"; print @cinfo' *.txt
perl -i.one -nle 'print 2==$. ? 0 : $_' *.txt
perl -i.one -ple '$_= 0 if 2==$.' *.txt
perl -i.one -pe '$_= "0\n" if 2==$.' *.txt

perl -i.one -le "BEGIN{@ARGV= glob(@ARGV)} chomp( my @cinfo= <> ); $ci
+nfo[1]= 0; print @cinfo" *.txt
perl -i.one -e "BEGIN{@ARGV= glob(@ARGV)} my @cinfo= <>; $cinfo[1]= 0.
+$/; print @cinfo" *.txt
perl -i.one -nle "BEGIN{@ARGV= glob(@ARGV)} print 2==$. ? 0 : $_" *.tx
+t
perl -i.one -ple "BEGIN{@ARGV= glob(@ARGV)} $_= 0 if 2==$." *.txt
perl -i.one -pe "BEGIN{@ARGV= glob(@ARGV)} $_= 0.$/ if 2==$." *.txt