TwitterのTLで知ったコマンドオプション yesとnetstat

yesコマンドにはオプションがある

[oc@centos5 ~]$ man yes
yes(1)                                                                  yes(1)



名前
       yes - kill されるまで文字列を繰り返して出力する

書式
       yes [string...]

       yes [--help] [--version]

説明
       yes はコマンドライン引数をスペースで区切って末尾に改行 (newline) を付加
       し、 kill されるまで繰り返して表示する。引数が一つも与えられな い と 、
       yes は ‘y’ に改行を付加したものを kill されるまで表示しつづける。

オプション
       GNU  yes が引数一つだけで起動された場合には、以下のオプションが認識され
       る:

       --help 標準出力に使用方法のメッセージを出力して正常終了する。

       --version
              標準出力にバージョン情報を出力して正常終了する。

注意
       プログラムのバグについては bug-sh-utils@gnu.org に報告してください。 ペ
       ージの更新は Ragnar Hojland Espinosa <ragnar@ragnar-hojland.com> が行っ
       ています。



GNU Shell Utilities 2.1          18 June 2002                           yes(1)

yesと言えば、「we can」しか思いつかない。

netstat --ip でUnixドメイン


netstat -aon (--ipなし)
[oc@centos5 ~]$ netstat -aon
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       Timer
tcp        0      0 0.0.0.0:645                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:139                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:21                  0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:5432                0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:445                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 192.168.170.21:445          192.168.170.1:1064          ESTABLISHED keepalive (3306.58/0/0)
tcp        0      0 :::80                       :::*                        LISTEN      off (0.00/0/0)
tcp        0      0 :::22                       :::*                        LISTEN      off (0.00/0/0)
tcp        0      0 :::5432                     :::*                        LISTEN      off (0.00/0/0)
tcp        0      0 :::25                       :::*                        LISTEN      off (0.00/0/0)
tcp        0    520 ::ffff:192.168.170.21:22    ::ffff:192.168.170.1:1692   ESTABLISHED on (0.24/0/0)
udp        0      0 127.0.0.1:32768             127.0.0.1:32768             ESTABLISHED off (0.00/0/0)
udp        0      0 0.0.0.0:32769               0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:642                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 192.168.170.21:137          0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:137                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 192.168.170.21:138          0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:138                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:5353                0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:111                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 192.168.170.21:123          0.0.0.0:*                               off (0.00/0/0)
udp        0      0 127.0.0.1:123               0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:123                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:639                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 :::32771                    :::*                                    off (0.00/0/0)
udp        0      0 :::5353                     :::*                                    off (0.00/0/0)
udp        0      0 fe80::20c:29ff:fec9:123     :::*                                    off (0.00/0/0)
udp        0      0 ::1:123                     :::*                                    off (0.00/0/0)
udp        0      0 :::123                      :::*                                    off (0.00/0/0)
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING     5827   /tmp/.font-unix/fs7100
unix  2      [ ACC ]     STREAM     LISTENING     7351   @/tmp/fam-root-
unix  2      [ ACC ]     STREAM     LISTENING     7152   /tmp/.X11-unix/X0
unix  2      [ ACC ]     STREAM     LISTENING     5481   /tmp/.s.PGSQL.5432
unix  2      [ ACC ]     STREAM     LISTENING     5671   /dev/gpmctl
unix  2      [ ACC ]     STREAM     LISTENING     7125   /tmp/.gdm_socket
unix  2      [ ACC ]     STREAM     LISTENING     6119   @/var/run/hald/dbus-Y6WUEzGrgw
unix  2      [ ACC ]     STREAM     LISTENING     6086   /var/run/avahi-daemon/socket
unix  2      [ ACC ]     STREAM     LISTENING     4319   /var/run/audispd_events
unix  2      [ ]         DGRAM                    1198   @/org/kernel/udev/udevd
unix  2      [ ]         DGRAM                    6128   @/org/freedesktop/hal/udev_event
unix  2      [ ACC ]     STREAM     LISTENING     5334   /var/lib/mysql/mysql.sock
unix  2      [ ACC ]     STREAM     LISTENING     4828   /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     4892   /var/run/sdp
unix  2      [ ACC ]     STREAM     LISTENING     4978   /var/run/pcscd.comm
unix  2      [ ACC ]     STREAM     LISTENING     5105   /var/run/acpid.socket
unix  2      [ ACC ]     STREAM     LISTENING     6120   @/var/run/hald/dbus-YrhFOOWN6h
unix  17     [ ]         DGRAM                    4350   /dev/log
unix  3      [ ]         STREAM     CONNECTED     22481
unix  3      [ ]         STREAM     CONNECTED     22480
unix  2      [ ]         DGRAM                    22476
unix  2      [ ]         DGRAM                    7744
unix  3      [ ]         STREAM     CONNECTED     7546   /tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     7545
unix  3      [ ]         STREAM     CONNECTED     7492   /tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     7491
unix  3      [ ]         STREAM     CONNECTED     7457   /tmp/.font-unix/fs7100
unix  3      [ ]         STREAM     CONNECTED     7456
unix  3      [ ]         STREAM     CONNECTED     7356   @/tmp/fam-root-
unix  3      [ ]         STREAM     CONNECTED     7355
unix  3      [ ]         STREAM     CONNECTED     7342   /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     7341
unix  3      [ ]         STREAM     CONNECTED     7176   /var/run/pcscd.comm
unix  3      [ ]         STREAM     CONNECTED     7175
unix  2      [ ]         DGRAM                    7164
unix  3      [ ]         STREAM     CONNECTED     7160   /var/run/acpid.socket
unix  3      [ ]         STREAM     CONNECTED     7159
unix  3      [ ]         STREAM     CONNECTED     7468   /tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     7156
unix  3      [ ]         STREAM     CONNECTED     6777   /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     6776
unix  3      [ ]         STREAM     CONNECTED     6756   @/var/run/hald/dbus-Y6WUEzGrgw
unix  3      [ ]         STREAM     CONNECTED     6755
unix  3      [ ]         STREAM     CONNECTED     6620   @/var/run/hald/dbus-Y6WUEzGrgw
unix  3      [ ]         STREAM     CONNECTED     6617
unix  3      [ ]         STREAM     CONNECTED     6583   /var/run/acpid.socket
unix  3      [ ]         STREAM     CONNECTED     6582
unix  3      [ ]         STREAM     CONNECTED     6574   @/var/run/hald/dbus-Y6WUEzGrgw
unix  3      [ ]         STREAM     CONNECTED     6573
unix  3      [ ]         STREAM     CONNECTED     6123   @/var/run/hald/dbus-YrhFOOWN6h
unix  3      [ ]         STREAM     CONNECTED     6122
unix  3      [ ]         STREAM     CONNECTED     6089   /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     6088
unix  3      [ ]         STREAM     CONNECTED     6083
unix  3      [ ]         STREAM     CONNECTED     6082
unix  2      [ ]         DGRAM                    6080
unix  2      [ ]         DGRAM                    5915
unix  2      [ ]         DGRAM                    5743
unix  3      [ ]         STREAM     CONNECTED     5721
unix  3      [ ]         STREAM     CONNECTED     5720
unix  3      [ ]         STREAM     CONNECTED     5713
unix  3      [ ]         STREAM     CONNECTED     5712
unix  2      [ ]         DGRAM                    5665
unix  2      [ ]         DGRAM                    5165
unix  2      [ ]         DGRAM                    5065
unix  2      [ ]         DGRAM                    5018
unix  2      [ ]         DGRAM                    4977
unix  3      [ ]         STREAM     CONNECTED     4891   /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     4890
unix  2      [ ]         DGRAM                    4864
unix  2      [ ]         DGRAM                    4854
unix  3      [ ]         STREAM     CONNECTED     4832
unix  3      [ ]         STREAM     CONNECTED     4831
unix  3      [ ]         STREAM     CONNECTED     4595
unix  3      [ ]         STREAM     CONNECTED     4594
unix  2      [ ]         DGRAM                    4461
unix  2      [ ]         DGRAM                    4358
unix  3      [ ]         STREAM     CONNECTED     4314
unix  3      [ ]         STREAM     CONNECTED     4313
netstat -aon --ip
[oc@centos5 ~]$ netstat -aon --ip
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       Timer
tcp        0      0 0.0.0.0:645                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:139                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:21                  0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:5432                0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 0.0.0.0:445                 0.0.0.0:*                   LISTEN      off (0.00/0/0)
tcp        0      0 192.168.170.21:445          192.168.170.1:1064          ESTABLISHED keepalive (3259.99/0/0)
udp        0      0 127.0.0.1:32768             127.0.0.1:32768             ESTABLISHED off (0.00/0/0)
udp        0      0 0.0.0.0:32769               0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:642                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 192.168.170.21:137          0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:137                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 192.168.170.21:138          0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:138                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:5353                0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:111                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 192.168.170.21:123          0.0.0.0:*                               off (0.00/0/0)
udp        0      0 127.0.0.1:123               0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:123                 0.0.0.0:*                               off (0.00/0/0)
udp        0      0 0.0.0.0:639                 0.0.0.0:*                               off (0.00/0/0)

環境

普段使ってるコマンドでも、知らないオプションはたくさんあるんだよな。
使い方が定型化してるものはマニュアルも確認しないから、TwitterのTLに
知らないコマンドやコマンドオプションが流れるのはありがたい。