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If you want to preserve order, this is how you uniq with awk: awk '!x[$0]++'

Yeah, but what if the strings I wanted to sort contain newlines?

You haven't specified a delimiter.

You (sir|madam), are a feature creep. If it weren’t for people like you and their “real requirements” software would be easy.

By the time you say “unicode” and “collation” the programmer is going to be in serious trouble.

Fortunately the programmer can lawyer the problem. The original requirements don’t specify what the strings are sorted by. I choose “position in original source” file and complete the task with a NOP.

echo "Input file already sorted."

protip:

tr ' ' '\n' < foo | sort | uniq