grep命令-v參數過濾以井號、分號開頭的注釋信息行及空白行

grep命令-v參數（反向選擇）分別去掉所有以#（井號）和;（分號）開頭的注釋信息行，對於剩余的空白行可以再用^$來表示並反選過濾

[root@rhel7 samba]# cat smb.conf | grep -v "#" | grep -v ";" | grep -v "^$"
[global]
        workgroup = MYGROUP
        server string = Samba Server Version %v
        log file = /var/log/samba/log.%m
        max log size = 50
        security = user
        passdb backend = tdbsam
        load printers = yes
        cups options = raw
[homes]
        comment = Home Directories
        browseable = no
        writable = yes
[printers]
        comment = All Printers
        path = /var/spool/samba
        browseable = no
        guest ok = no
        writable = no
        printable = yes