uniq
uniq linux command cheatsheet by Thamizhiniyan C S
Introduction
Unique command filters the output (from either a file or stdin) to remove any duplicates.
Syntax
uniq [OPTION]... [INPUT [OUTPUT]]
Important Flags
-c
To count the occurrences of every line in file or stdin
-d
Will only print the lines that are repeated, not the one which are unique
-u
Will only print lines that are already uniq
-i
Ignores case(Default is case-sensitive)
Examples
Remove the consecutive repetitions of any line
Count the occurrences of consecutive identical lines in the input, then cut out the first six characters (presumably to remove the counts added by uniq -c), leaving only the original content of the lines
Count the occurrences of consecutive identical lines while ignoring case differences and then remove the count information, leaving only the original content of the lines
Print only the lines that occur exactly once in the input, discarding any duplicate lines.
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