File: histsort.awk

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# histsort.awk --- compact a shell history file
# Arnold Robbins, arnold@gnu.ai.mit.edu, Public Domain
# May 1993

# Thanks to Byron Rakitzis for the general idea
{
    if (data[$0]++ == 0)
        lines[++count] = $0
}

END {
    for (i = 1; i <= count; i++)
        print lines[i]
}