//Tips tagged uniq
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You can use the 'uniq' command to handle duplicate lines in a file:

$ cat tst
a
a
b
c
c
d

$ uniq -d tst //show duplicated lines a c
$ uniq -u tst //show unique lines b d
$ uniq tst //remove duplicates a b c d


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You might want to get rid of the awk, sort, uniq and grep depending on how much info you need.

for dir in $(find /proc -maxdepth 1 -type d -name "*[0-9]");do ls -l $dir/fd/ | awk '{print $11}';done | sort | uniq | grep "^/var/"



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