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http://www.unix.com – Code: lyang0@lyang0-OptiPlex-755:~$ tr 'A-Z' 'a-z' <<< `printf 'DE:EF:BE:%02X:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256)) $((RANDOM%256))` de:ef:be:20:a2:e8 lyang0@lyang0-OptiPlex-755:~$ GUEST_MAC=`tr 'A-Z' 'a-z' <<< `printf 'DE:EF:BE:%02X:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256)) $((RANDOM%256))`` bash: command substitution: line 1: syntax error near unexpected token `newline' bash: command substitution: line 1: `tr 'A-Z' 'a-z' <<< ' DE:EF:BE:%02X:%02X:%02X\n: command not found (HowTos)