使用ps命令查找到指定名字的进程ID，有时会出现查找的结果中进程启动的命令以及参数信息被截断了

用户wanng启动了一个进程 wanng_qytrunkcross, 启动参数是 config.lua 文件,执行 ps -u wanng 查找用户的进程。

正常显示的结果应该是: ./wanng_qytrunkcross config.lua

但实际的结果如下：

[wanng@localhost shell]# ps -u wanng
   PID TTY          TIME CMD
127271 ?        00:00:01 sshd
127272 pts/4    00:00:00 bash
127332 pts/4    00:17:19 wanng_qytrunkcros
从上面的结果中发现进程名和启动参数的显示被截断了
以下是通过man ps查询到的解决办法，提到的三种方法都可以解决这个问题
w Wide output. Use this option twice for unlimited width
-w Wide output. Use this option twice for unlimited width.
-f Do full-format listing. This option can be combined with many other UNIX-style options to add additional columns. It also causes the command arguments to be printed. When used with -L, the NLWP (number of threads) and LWP (thread ID) columns will be added. See the c option, the format keyword args, and the format keyword comm.
-F Extra full format. See the -f option, which -F implies.
在 ps 后面加上 -w w 选项,命令执行结果如下
[wanng@localhost shell]# ps -u wanng -w w
   PID TTY      STAT   TIME COMMAND
127271 ?        S      0:01 sshd: wanng@pts/4
127272 pts/4    Ss+    0:00 -bash
127332 pts/4    Sl    17:20 ./wanng_qytrunkcross config.lua
在 ps 后面加上 ww 选项,命令执行结果如下
[wanng@localhost shell]# ps -u wanng ww
   PID TTY      STAT   TIME COMMAND
127271 ?        S      0:01 sshd: wanng@pts/4
127272 pts/4    Ss+    0:00 -bash
127332 pts/4    Sl    17:20 ./wanng_qytrunkcross config.lua
在 ps 后面加上 -f 或 -F 选项,表示以全格式显示，命令执行结果如下
[wanng@localhost shell]# ps -f -u wanng
UID         PID   PPID  C STIME TTY          TIME CMD
wanng      127271 127269  0 13:55 ?        00:00:01 sshd: wanng@pts/4
wanng      127272 127271  0 13:55 pts/4    00:00:00 -bash
wanng      127332      1  3 13:55 pts/4    00:18:30 ./wanng_qytrunkcross config.lua
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