Network
 Network devices /proc/net/dev
Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:    1540      22    0    0    0     0          0         0     1540      22    0    0    0     0       0          0
 dummy:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
  eth0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
  ppp0:  450142     560    3    0    0     3          0         0    61889     597    0    0    0     0       0          0
 

root@deltabell:/proc/net>cat tcp
  sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode
   0: 00000000:1770 00000000:0000 0A 00000000:00000000 00:00000000 00000000   501        0 186
   1: 00000000:1B59 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 174
   2: 00000000:1538 00000000:0000 0A 00000000:00000000 00:00000000 00000000   100        0 157
   3: 00000000:0050 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 149
   4: 00000000:0203 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 128
   5: 00000000:0062 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 123
   6: 00000000:0071 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 122
   7: 00000000:0025 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 120
   8: 00000000:004F 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 119
   9: 00000000:008F 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 118
  10: 00000000:006E 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 117
  11: 00000000:006D 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 116
  12: 00000000:0201 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 113
  13: 00000000:0202 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 112
  14: 00000000:0046 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 111
  15: 00000000:0017 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 110
  16: 00000000:0015 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 109
  17: 00000000:006F 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 98
root@deltabell:/proc/net>tca udp
tca: Command not found.
root@deltabell:/proc/net>cat udp
  sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode
   0: 00000000:0025 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 121
   1: 00000000:0206 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 115
   2: 00000000:0205 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 114
   3: 00000000:006F 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 96
   4: 00000000:0202 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 78
root@deltabell:/proc/net>cat unix
Num       RefCount Protocol Flags    Type St Inode Path
c30e2020: 00000001 00000000 00040000 0001 03   201 @00000009
c3ca3d20: 00000001 00000000 00000000 0001 03   197 @00000007
c3ca3000: 00000000 00000000 00010000 0001 01   158 /tmp/.s.PGSQL.5432
c30e2800: 00000001 00000000 00000000 0001 03   203 @0000000a
c2fe8a80: 00000001 00000000 00000000 0001 03  3201 @0000008c
c3ca3540: 00000000 00000000 00010000 0001 01   187 /tmp/.X11-unix/X0
c30e2d40: 00000001 00000000 00000000 0001 03   228 @00000010
c2fe82a0: 00000001 00000000 00040000 0001 03  5640 @000000f4
c0093aa0: 00000000 00000000 00010000 0001 01    76 /dev/log
c2fe8d20: 00000001 00000000 00000000 0001 03  8677 @00000161
c3ca37e0: 00000001 00000000 00000000 0001 03   189 @00000004
c3b4c560: 00000000 00000000 00010000 0001 01   141 /var/run/gpmctl
c3b4c020: 00000000 00000000 00010000 0001 01   126 /dev/printer
c0824000: 00000001 00000000 00000000 0001 03  8678 /tmp/.X11-unix/X0
c2fe8000: 00000001 00000000 00000000 0001 03  5641 /tmp/.X11-unix/X0
c2fe8540: 00000001 00000000 00000000 0001 03  3202 /tmp/.X11-unix/X0
c2fe87e0: 00000001 00000000 00000000 0001 03   229 /tmp/.X11-unix/X0
c30e2aa0: 00000001 00000000 00000000 0001 03   204 /tmp/.X11-unix/X0
c30e22c0: 00000001 00000000 00000000 0001 03   202 /tmp/.X11-unix/X0
c30e2560: 00000001 00000000 00000000 0001 03   198 /tmp/.X11-unix/X0
c3ca3a80: 00000001 00000000 00000000 0001 03   190 /tmp/.X11-unix/X0
c3b71540: 00000000 00000000 00000000 0001 01   139
 

root@deltabell:/proc/net>netstat -a
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 *:6000                  *:*                     LISTEN
tcp        0      0 *:7001                  *:*                     LISTEN
tcp        0      0 *:5432                  *:*                     LISTEN
tcp        0      0 *:www                   *:*                     LISTEN
tcp        0      0 *:printer               *:*                     LISTEN
tcp        0      0 *:linuxconf             *:*                     LISTEN
tcp        0      0 *:auth                  *:*                     LISTEN
tcp        0      0 *:time                  *:*                     LISTEN
tcp        0      0 *:finger                *:*                     LISTEN
tcp        0      0 *:imap                  *:*                     LISTEN
tcp        0      0 *:pop                   *:*                     LISTEN
tcp        0      0 *:pop-2                 *:*                     LISTEN
tcp        0      0 *:login                 *:*                     LISTEN
tcp        0      0 *:shell                 *:*                     LISTEN
tcp        0      0 *:gopher                *:*                     LISTEN
tcp        0      0 *:telnet                *:*                     LISTEN
tcp        0      0 *:ftp                   *:*                     LISTEN
tcp        0      0 *:sunrpc                *:*                     LISTEN
udp        0      0 *:time                  *:*
udp        0      0 *:ntalk                 *:*
udp        0      0 *:talk                  *:*
udp        0      0 *:sunrpc                *:*
udp        0      0 *:syslog                *:*
raw        0      0 *:1                     *:*
raw        0      0 *:6                     *:*
Active UNIX domain sockets (including servers)
Proto RefCnt Flags       Type       State         I-Node Path
unix  1      [ N ]       STREAM     CONNECTED     201    @00000009
unix  1      [ ]         STREAM     CONNECTED     197    @00000007
unix  0      [ ACC ]     STREAM     LISTENING     158    /tmp/.s.PGSQL.5432
unix  1      [ ]         STREAM     CONNECTED     203    @0000000a
unix  1      [ ]         STREAM     CONNECTED     3201   @0000008c
unix  0      [ ACC ]     STREAM     LISTENING     187    /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     228    @00000010
unix  1      [ N ]       STREAM     CONNECTED     5640   @000000f4
unix  0      [ ACC ]     STREAM     LISTENING     76     /dev/log
unix  1      [ ]         STREAM     CONNECTED     8677   @00000161
unix  1      [ ]         STREAM     CONNECTED     189    @00000004
unix  0      [ ACC ]     STREAM     LISTENING     141    /var/run/gpmctl
unix  0      [ ACC ]     STREAM     LISTENING     126    /dev/printer
unix  1      [ ]         STREAM     CONNECTED     8678   /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     5641   /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     3202   /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     229    /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     204    /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     202    /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     198    /tmp/.X11-unix/X0
unix  1      [ ]         STREAM     CONNECTED     190    /tmp/.X11-unix/X0
unix  0      [ ]         STREAM                   139
 
 

/usr/src/linux/fs/proc/array.c

pid  pid,
name            tsk->comm,
state           state,
ppid            tsk->p_pptr->pid,
?                tsk->pgrp,
                tsk->session,
                tsk->tty ? kdev_t_to_nr(tsk->tty->device) : 0,
                tty_pgrp,
                tsk->flags,
                tsk->min_flt,
                tsk->cmin_flt,
                tsk->maj_flt,
                tsk->cmaj_flt,
uptime          tsk->times.tms_utime,
starttime        tsk->times.tms_stime,
                tsk->times.tms_cutime,
                tsk->times.tms_cstime,
                priority,
                nice,
                tsk->timeout,
                tsk->it_real_value,
                tsk->start_time,
                vsize,
                tsk->mm ? tsk->mm->rss : 0, /* you might want to shift this lef
t 3 */
                tsk->rlim ? tsk->rlim[RLIMIT_RSS].rlim_cur : 0,
                tsk->mm ? tsk->mm->start_code : 0,
                tsk->mm ? tsk->mm->end_code : 0,
                tsk->mm ? tsk->mm->start_stack : 0,
                esp,
                eip,
                /* The signal information here is obsolete.
                 * It must be decimal for Linux 2.0 compatibility.
                 * Use /proc/#/status for real-time signals.
                 */
                tsk->signal .sig[0] & 0x7fffffffUL,
                tsk->blocked.sig[0] & 0x7fffffffUL,
                sigign      .sig[0] & 0x7fffffffUL,
                sigcatch    .sig[0] & 0x7fffffffUL,
                wchan,
                tsk->nswap,
                tsk->cnswap,
                tsk->exit_signal);

      SHORT   LONG            DESCRIPTION
       c       cmd             simple name of executable
       C       cmdline         full command line
       f       flags           flags as in long format F field
       g       pgrp            process group ID
       G       tpgid           controlling tty process group ID
       j       cutime          cumulative user time
       J       cstime          cumulative system time
       k       utime           user time
       K       stime           system time
       m       min_flt         number of minor page faults
       M       maj_flt         number of major page faults
       n       cmin_flt        cumulative minor page faults
       N       cmaj_flt        cumulative major page faults
       o       session         session ID
       p       pid             process ID
       P       ppid            parent process ID
       r       rss             resident set size
       R       resident        resident pages
       s       size            memory size in kilobytes
       S       share           amount of shared pages
       t       tty             the minor device number of tty
       T       start_time      time process was started
       U       uid             user ID number
       u       user            user name
       v       vsize           total VM size in bytes
       y       priority        kernel scheduling priority