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Forum: Shell Programming and Scripting 09-01-2013

Bash - remove duplicates without sort

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Hi. I tried: echo -e...

Hi.
I tried:

echo -e "prova\012zappa\012prova\012quadro\012cesto\012zappa" | awk '!a[$0]++'
and it works :).

Please explain me what does it means:
'!a[$0]++'

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