$ for domain in `cat /usr/share/dict/* | perl -ne's/io$/.io/ && print lc if length == 6'` ; do whois $domain | grep "\- Available" ; done Domain "DUR.IO" - Available Domain "DUS.IO" - Available Domain "FER.IO" - Available Domain "GOB.IO" - Available Domain "IDD.IO" - Available Domain "KOK.IO" - Available Domain "NGA.IO" - Available Domain "PAP.IO" - Available Domain "SOD.IO" - Available Domain "TUR.IO" - Available Domain "DUR.IO" - Available Domain "DUS.IO" - Available Domain "FER.IO" - Available Domain "GOB.IO" - Available Domain "IDD.IO" - Available Domain "KOK.IO" - Available Domain "NGA.IO" - Available Domain "PAP.IO" - Available Domain "SOD.IO" - Available Domain "TUR.IO" - Available