檢視系統命令的手冊頁

man <command>

這將顯示指定命令的手冊頁。

例如，man ping 將顯示：

`PING(8)`                   BSD System Manager's Manual                  `PING(8)`

NAME
     ping -- send ICMP ECHO_REQUEST packets to network hosts

SYNOPSIS
     ping [-AaCDdfnoQqRrv] [-b boundif] [-c count] [-G sweepmaxsize]
          [-g sweepminsize] [-h sweepincrsize] [-i wait] [-k trafficclass]
          [-l preload] [-M mask | time] [-m ttl] [-P policy] [-p pattern]
          [-S src_addr] [-s packetsize] [-t timeout] [-W waittime] [-z tos]
          host
     ping [-AaDdfLnoQqRrv] [-b boundif] [-c count] [-I iface] [-i wait]
          [-k trafficclass] [-l preload] [-M mask | time] [-m ttl] [-P policy]
          [-p pattern] [-S src_addr] [-s packetsize] [-T ttl] [-t timeout]
          [-W waittime] [-z tos] mcast-group

DESCRIPTION
     The ping utility uses the ICMP protocol's mandatory ECHO_REQUEST datagram
     to elicit an ICMP ECHO_RESPONSE from a host or gateway.  ECHO_REQUEST
     datagrams (``pings'') have an IP and ICMP header, followed by a ``struct
     timeval'' and then an arbitrary number of ``pad'' bytes used to fill out
     the packet.  The options are as follows:

...

在檢視聯機幫助頁時，可以搜尋它。鍵入斜槓（/）後跟搜尋詞將跳轉到該術語的第一個出現。示例：/ping

之後按 N 將跳到下一次出現。Shift+N 將跳轉到上一次發生。