title: How to redirect output of top command in a file
body: <p>for monitoring purpose of system, i need to redirect the output of top command in a file so i will use/parse it.
  i am trying to do same thing but CPU performance stats are not getting saved in a file see
  screen shots.
  expected output:</p>
  
  <pre><code>[root@v100 /usr/local/bin]# top
  last pid:  6959;  load averages:  0.01,  0.03,  0.03                                                                                   up 0+02:47:34  17:51:16
  114 processes: 1 running, 108 sleeping, 5 zombie
  CPU:  0.0% user,  0.0% nice,  1.6% system,  0.0% interrupt, 98.4% idle
  Mem: 734M Active, 515M Inact, 226M Wired, 212M Buf, 491M Free
  Swap: 4095M Total, 4095M Free
  
   PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
   1953 root      150  20    0  3084M   635M uwait    2:44  0.00% java
   1663 mysql      46  20    0   400M   139M sbwait   1:29  0.00% mysqld
   1354 root       31  20    0 94020K 50796K uwait    0:24  0.00% beam
   4233 root        1  20    0   122M 23940K select   0:06  0.00% python
   1700 zabbix      1  20    0 20096K  2436K nanslp   0:03  0.00% zabbix_agentd
   1799 zabbix      1  20    0   103M  7240K nanslp   0:02  0.00% zabbix_server
   4222 root        1  30    0   122M 23300K select   0:02  0.00% python
   1696 zabbix      1  20    0 19968K  2424K nanslp   0:02  0.00% zabbix_agentd
   2853 root        1  20    0   126M 29780K select   0:02  0.00% python
   1793 zabbix      1  20    0   103M  7152K nanslp   0:01  0.00% zabbix_server
   1797 zabbix      1  20    0   103M  8348K nanslp   0:01  0.00% zabbix_server
   1752 root        1  20    0   122M 22344K select   0:01  0.00% python
   1796 zabbix      1  20    0   103M  8136K nanslp   0:01  0.00% zabbix_server
   1795 zabbix      1  20    0   103M  8208K nanslp   0:01  0.00% zabbix_server
   1801 zabbix      1  20    0   103M  7100K nanslp   0:01  0.00% zabbix_server
   3392 root        1  20    0   122M 23392K select   0:01  0.00% python
   1798 zabbix      1  20    0   103M  7860K nanslp   0:01  0.00% zabbix_server
   2812 root        1  20    0   134M 25184K select   0:01  0.00% python
   1791 zabbix      1  20    0   103M  7188K nanslp   0:01  0.00% zabbix_server
   1827 root        1 -52   r0 14368K  1400K nanslp   0:01  0.00% watchdogd
   1790 zabbix      1  20    0   103M  7164K nanslp   0:01  0.00% zabbix_server
   1778 zabbix      1  20    0   103M  8608K nanslp   0:01  0.00% zabbix_server
   1780 zabbix      1  20    0   103M  8608K nanslp   0:01  0.00% zabbix_server
   2928 root        1  20    0   122M 23272K select   0:01  0.00% python
   2960 root        1  20    0   116M 22288K select   0:01  0.00% python
   1776 zabbix      1  20    0   103M  7248K nanslp   0:01  0.00% zabbix_server
   2892 root        1  20    0   122M 22648K select   0:01  0.00% python
   1789 zabbix      1  20    0   103M  7128K nanslp   0:01  0.00% zabbix_server
   1814 root        1  20    0   216M 15796K select   0:01  0.00% httpd
   1779 zabbix      1  20    0   103M  8608K nanslp   0:01  0.00% zabbix_server
   1783 zabbix      1  20    0   103M  8608K nanslp   0:01  0.00% zabbix_server
   1800 zabbix      1  20    0   103M  7124K nanslp   0:01  0.00% zabbix_server
   1782 zabbix      1  20    0   103M  8608K nanslp   0:01  0.00% zabbix_server
   1781 zabbix      1  20    0   103M  8608K nanslp   0:00  0.00% zabbix_server
   1792 zabbix      1  20    0   103M  7172K nanslp   0:00  0.00% zabbix_server
   2259 root        2  20    0 48088K  4112K uwait    0:00  0.00% cb_heuristics
  </code></pre>
  
  <p>If i do: </p>
  
  <pre><code>[root@v100 /usr/local/bin]# top &gt; /tmp/top.output
  </code></pre>
  
  <p>then it shows:</p>
  
  <pre><code>[root@v100 /usr/local/bin]# cat /tmp/top.output
  
   last pid:  7080;  load averages:  0.09,  0.06,  0.03  up 0+02:52:24    17:56:06
   114 processes: 1 running, 108 sleeping, 5 zombie
  
   Mem: 731M Active, 515M Inact, 219M Wired, 212M Buf, 501M Free
   Swap: 4095M Total, 4095M Free
  
    PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
    1953 root      150  20    0  3084M   633M uwait    2:17  0.00% java
    1663 mysql      46  20    0   400M   136M sbwait   1:08  0.00% mysqld
    1354 root       31  20    0 94020K 49924K uwait    0:18  0.00% beam
    4233 root        1  20    0   122M 23776K select   0:04  0.00% python
    1700 zabbix      1  20    0 20096K  2436K nanslp   0:02  0.00% zabbix_agentd
    1799 zabbix      1  20    0   103M  7240K nanslp   0:01  0.00% zabbix_server
    2853 root        1  20    0   126M 29780K select   0:01  0.00% python
    1696 zabbix      1  20    0 19968K  2424K nanslp   0:01  0.00% zabbix_agentd
    4222 root        1  28    0   122M 23264K select   0:01  0.00% python
    1793 zabbix      1  20    0   103M  7152K nanslp   0:01  0.00% zabbix_server
    1752 root        1  20    0   122M 22344K select   0:01  0.00% python
    1797 zabbix      1  20    0   103M  8088K nanslp   0:01  0.00% zabbix_server
    1796 zabbix      1  20    0   103M  7944K nanslp   0:01  0.00% zabbix_server
    1795 zabbix      1  20    0   103M  8044K nanslp   0:01  0.00% zabbix_server
    1801 zabbix      1  20    0   103M  7100K nanslp   0:01  0.00% zabbix_server
    3392 root        1  20    0   122M 23312K select   0:01  0.00% python
    2812 root        1  20    0   134M 25184K select   0:01  0.00% python
    1798 zabbix      1  20    0   103M  7628K nanslp   0:01  0.00% zabbix_server
  </code></pre>
  
  <p>so here, I am able to monitor Memory but not CPU
  reason is during redirect output of <strong>top</strong> CPU stats did not update</p>
  
  <p><strong><em>How can i capture CPU stats also?</em></strong></p>
  
  <p>if you have any suggestion pls tell me.</p>