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[ 1 -ne 1 ] will return the value 1. [ 1 -ne 1 ] va returna valoarea 1.[ -n string ] check if string is empty. [ -n string ] verifică dacă string este gol.\. Pentru evitarea interpretării greșite a caracterelor speciale, se folosește caracterul special de evitare
\.wc -w counts words. Comanda wc -w numără cuvinte.