php - 使用 PHP 解析 "top"命令(Shell)的输出

Question

我正在尝试使用 PHP 导出“top”命令 (unix) 的输出。使用“exex”函数调用和读取命令/输出非常简单，但问题是:“top”命令输出(顺序、名称等)是否始终相同？还是与我使用的发行版有关？

有什么方法可以在 UNIX 系统上“通用”地解析这些信息吗？

提前致谢

Answer 1

您可以使用 ps 来代替，使用参数 -A 和 -o，如下所示:

ps -Ao %cpu,%mem,user,comm

这会为您提供与调用命令时指定的输出完全相同的输出:

 0.0  0.1 root     udisks-daemon
 0.0  0.0 root     udisks-daemon
 0.0  0.1 root     gdm-simple-slav
11.0  0.4 root     Xorg
 0.0  0.1 root     NetworkManager
 0.0  0.1 root     polkitd
 0.0  0.1 root     gdm3

参数:

-A     Select all processes.

-o format
              User-defined format.  format is a single argument in the
              form of a blank-separated or comma-separated list, which
              offers a way to specify individual output columns.  The
              recognized keywords are described in the STANDARD FORMAT
              SPECIFIERS section below.  Headers may be renamed (ps -o
              pid,ruser=RealUser -o comm=Command) as desired.  If all
              column headers are empty (ps -o pid= -o comm=) then the
              header line will not be output.  Column width will
              increase as needed for wide headers; this may be used to
              widen up columns such as WCHAN (ps -o pid,wchan=WIDE-
              WCHAN-COLUMN -o comm).  Explicit width control (ps opid,
              wchan:42,cmd) is offered too.  The behavior of ps -o
              pid=X,comm=Y varies with personality; output may be one
              column named "X,comm=Y" or two columns named "X" and "Y".
              Use multiple -o options when in doubt.  Use the PS_FORMAT
              environment variable to specify a default as desired;
              DefSysV and DefBSD are macros that may be used to choose
              the default UNIX or BSD columns.

您可以使用的所有STANDARD FORMAT SPECIFIERS，您可以在 ps 的手册页中找到，但为了方便起见，我也将它们复制到这里:

https://gist.github.com/ivankovacevic/9918272