I am writing a perl script to merge several dozen data files into one file. The merger is pretty easy but after the merger I have to change a line for each data snapshot so that they are sequential. For example, my merged data file would look something like: 
"1"
{
     "time: 1247";
     "sump:  15";
}
"2"
{
     "time: 1255";
     "sump:  9";
}
"8"
{
     "time: 1350";
     "sump:  7";
}
"5"
{
     "time: 1600";
     "sump:  3";
}

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I have to re-order the "1", "2", "5", and "8" to be "1", "2", "3", and "4". I have to do this for several thousand points. Any ideas how I can do this most efficiently?

In reply to Re-ordering data in data file by Lhamo_rin

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