from grep manual in debian. Output a zero byte (the ASCII NUL character) instead of the character that normally follows a file name $grep -Z FACK * proc.c SNMP_MIB_ITEM(“TCPFACKReorder”, LINUX_MIB_TCPFACKREORDER), sysctl_net_ipv4.c .ctl_name = NET_TCP_FACK, tcp_input.c * Packet counting of FACK is based on in-order assumptions, therefore TCP tcp_input.c mib_idx = LINUX_MIB_TCPFACKREORDER; tcp_input.c * A”. Its …