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uniq

1. Name

uniq [man page] - report or omit repeated lines

2. Synopsis

uniq [OPTION]... [INPUT [OUTPUT]]

-i, --ignore-case
      ignore differences in case when comparing
-u, --unique
      only print unique lines

Suppose we have a file with content:

$ echo -e "a\nb\nA\nc\nd\nc\nE\ne" > file

unig command will print only unique lines within file: NOTE: Only consecutive lines counts as NOT unique.

$ uniq file

Ignore differences in case when comparing a file:

$ uniq -i file