Linux操作系统中ps命令常见用法

今天药忘吃喽~ 2022-05-20 08:37 336阅读 0赞

本文主要介绍 Linux 操作系统中 ps 命令的常见用法。

# 1 概述 #

ps 命令的作用：report a snapshot of the current processes.

# 2 常见用法 #

## 2.1 常用选项 ##

**-e**： Select all processes. Identical to -A.

**-f**：does 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.

## 2.2 关键字及描述 ##

p -- pid -- process ID

P -- ppid -- parent ID

注意：在 Linux 操作系统中，使用 ps 打印进程及线程信息时， 实际上 PID 表示线程信息，而 PPID 表示该线程所属的进程信息。如下：

Suse-116:~ # ps -efL |head -1;ps -efL|grep agency_server
    UID        PID  PPID   LWP  C NLWP STIME TTY          TIME CMD
    root      2078 14610  2078  0    1 Jul12 ?        00:00:00 agency_server 63 0 8011 /usr/local/middle/log/agency_server/agency_server 10000000 20
    root      2079 14610  2079  0    1 Jul12 ?        00:00:00 agency_server 63 1 8011 /usr/local/middle/log/agency_server/agency_server 10000000 20
    root     32581 25137 32581  0    1 09:53 pts/0    00:00:00 grep --color agency_server
    Suse-116:~ #

从上述打印结果就能看到，线程 LWP（lighter weight process，轻量级进程）与 PID 一致，印证了上述内容。

## 2.3 打印标题信息 ##

用法样式如下：

ps -ef|head -1;ps -ef|grep 进程名

用法示例如下：

Suse-116:~ # ps -ef|head -1;ps -ef|grep agency_server
    UID        PID  PPID  C STIME TTY          TIME CMD
    root      2078 14610  0 Jul12 ?        00:00:00 agency_server 63 0 8011 /usr/local/middle/log/agency_server/agency_server 10000000 20
    root      2079 14610  0 Jul12 ?        00:00:00 agency_server 63 1 8011 /usr/local/middle/log/agency_server/agency_server 10000000 20
    root     29203 29029  0 09:26 pts/3    00:00:00 grep --color agency_server
    Suse-116:~ #

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