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  1. or download this
    $line=`cmd 1; cmd 2 ; cmd 3 .... cmd n `;
    
  2. or download this
    $line=`cmd 1; cmd 2 ; cmd 3 ;alarm() { /bin/perl -e 'alarm shift; exec
    + @ARGV' "$@"; } ;alarm 4 'cmd 4 '.... cmd n `;