uniq
SafeCollapse duplicate lines
sort <file> | uniq -c
Collapses adjacent duplicates (sort first). -c counts occurrences — the classic log frequency idiom.
Examples
awk '{print $1}' access.log | sort | uniq -c | sort -rn | headTop client IPs
Syntax
uniq [-c] [-d] [file]
Before you run it
Read only.
The same reference, with no signal at all
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