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4.16 Remove All Duplicated Lines
This script prints only unique lines, like ‘uniq -u’.
#!/usr/bin/sed -f
# Search for a duplicate line --- until that, print what you find.
$b
N
/^\(.*\)\n\1$/ ! {
P
D
}
:c # Got two equal lines in pattern space. At the # end of the file we simply exit $d
# Else, we keep reading lines with N until we
# find a different one
s/.*\n//
N
/^\(.*\)\n\1$/ {
bc
}
# Remove the last instance of the duplicate line # and go back to the top D
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