uniq - report or omit repeated lines
Source code on GitHub: https://github.com/coreutils/coreutils/blob/master/src/uniq.c
uniq Cheat Sheet
uniq -c | sed -e 's/^[ \t]//' uniq -u
Practice until you can't make it wrong.
uniq - report or omit repeated lines
Source code on GitHub: https://github.com/coreutils/coreutils/blob/master/src/uniq.c
uniq -c | sed -e 's/^[ \t]//' uniq -u