blocks|key|1273243|text|ps+-p+<pid>+-o+%25cpu,%25mem,cmd|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1273244|(您可以去掉"cmd“，但这可能对调试有帮助)。|unstyled|1273245|请注意，这提供了进程在运行期间的平均CPU使用率。|1273246|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>ps -p &lt;pid&gt; -o %cpu,%mem,cmd
</code></pre>

(You can leave off "cmd" but that might be helpful in debugging).

Note that this gives average CPU usage of the process over the time it has been running.

blocks|key|1273492|text|caf's+answer的一个变体：top+-p+<pid>|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1273493|这会自动刷新CPU使用率，以便进行监控。|1273494|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/1221597/13326^0|I|C|0|C|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

A variant of <a href="https://stackoverflow.com/a/1221597/13326">caf's answer</a>:
<code>top -p &lt;pid&gt;</code>

This auto-refreshes the CPU usage so it's good for monitoring.

blocks|key|1488302|text|您可以使用以下命令按进程的名称获取结果|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1488303|ps+-C+chrome+-o+%25cpu,%25mem,cmd|code-block|syntax|javascript|1488304|-C选项允许您使用进程名称，而无需知道它的pid。|offset|length|style|CODE|1488305|entityMap^0|0|0|0|2|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can get the results by the name of the process using 

<pre><code>ps -C chrome -o %cpu,%mem,cmd
</code></pre>

the <code>-C</code> option allows you to use process name without knowing it's pid.

blocks|key|1488241|text|使用pidstat+(从sysstat+-+Refer+Link)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1488242|例如，要每5秒监视这两个进程ID+(12345和11223)，请使用|1488243|$+pidstat+-h+-r+-u+-v+-p+12345,11223+5|code-block|syntax|javascript|1488244|entityMap|0|LINK|mutability|MUTABLE|url|http://sebastien.godard.pagesperso-orange.fr/documentation.html^0|M|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Use pidstat (from sysstat - <a href="http://sebastien.godard.pagesperso-orange.fr/documentation.html">Refer Link</a>).

e.g. to monitor these two process IDs (12345 and 11223) every 5 seconds use

<pre><code>$ pidstat -h -r -u -v -p 12345,11223 5
</code></pre>

blocks|key|1487838|text|您可以使用top+-b和grep获得所需的pid+(使用-b标志top以批处理模式运行)，也可以使用-p标志并指定pid，而不使用grep。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1487839|entityMap^0|5|6|S|2|1E|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

You could use <code>top -b</code> and grep out the pid you want (with the <code>-b</code> flag top runs in batch mode), or also use the <code>-p</code> flag and specify the pid without using grep.

blocks|key|1488414|text|正如上面在caf's+answer中所评论的，ps和在某些情况下pidstat会给出pCPU的平均寿命。若要获得更准确的结果，请使用top。如果您需要运行top，则可以运行：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1488415|top+-b+-n+1+-p+<PID>|code-block|syntax|javascript|1488416|或者仅用于处理数据和标头：|1488417|top+-b+-n+1+-p+<PID>+%7C+tail+-3+%7C+head+-2|1488418|不带标头：|1488419|top+-b+-n+1+-p+<PID>+%7C+tail+-2+%7C+head+-1|1488420|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/1221597/13326^0|5|C|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

As commented in <a href="https://stackoverflow.com/a/1221597/13326">caf's answer</a> above, ps and in some cases pidstat will give you the lifetime average of the pCPU.
To get more accurate results use top. If you need to run top once you can run:

<pre><code>top -b -n 1 -p &lt;PID&gt;
</code></pre>

or for process only data and header:

<pre><code>top -b -n 1 -p &lt;PID&gt; | tail -3 | head -2
</code></pre>

without headers:

<pre><code>top -b -n 1 -p &lt;PID&gt; | tail -2 | head -1
</code></pre>

blocks|key|1488183|text|ps+aux+%7C+awk+'{print+$4"\t"$11}'+%7C+sort+%7C+uniq+-c+%7C+awk+'{print+$2"+"$1"+"$3}'+%7C+sort+-nr|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1488184|或每个进程|unstyled|1488185|ps+aux+%7C+awk+'{print+$4"\t"$11}'+%7C+sort+%7C+uniq+-c+%7C+awk+'{print+$2"+"$1"+"$3}'+%7C+sort+-nr+%7Cgrep+mysql|1488186|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>ps aux | awk '{print $4"\t"$11}' | sort | uniq -c | awk '{print $2" "$1" "$3}' | sort -nr
</code></pre>

or per process

<pre><code>ps aux | awk '{print $4"\t"$11}' | sort | uniq -c | awk '{print $2" "$1" "$3}' | sort -nr |grep mysql
</code></pre>

blocks|key|1273992|text|以下命令获取特定进程每40秒的CPU和内存使用率平均值(Pid)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1273993|pidstat+40+-ru+-p+<pid>|code-block|syntax|javascript|1273994|我的输出(前两行表示CPU使用情况，后两行表示内存使用情况)：|1273995|02:15:07+PM+++++++PID++++%25usr+%25system++%25guest++++%25CPU+++CPU++Command
02:15:47+PM+++++24563++++0.65++++0.07++++0.00++++0.73+++++3++java

02:15:07+PM+++++++PID++minflt/s++majflt/s+++++VSZ++++RSS+++%25MEM++Command
02:15:47+PM+++++24563++++++6.95++++++0.00+13047972+2123268+++6.52++java|1273996|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The following command gets the average of CPU and memory usage every 40 seconds for a specific process(pid)

<pre><code>pidstat 40 -ru -p &lt;pid&gt;
</code></pre>

Output for my case(first two lines for CPU usage, second two lines for memory):

<pre><code>02:15:07 PM PID %usr %system %guest %CPU CPU Command
02:15:47 PM 24563 0.65 0.07 0.00 0.73 3 java

02:15:07 PM PID minflt/s majflt/s VSZ RSS %MEM Command
02:15:47 PM 24563 6.95 0.00 13047972 2123268 6.52 java
</code></pre>

blocks|key|1273890|text|对于那些苦苦挣扎了一段时间的人来说，他们想知道为什么选择的答案不起作用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1273891|ps+-p+<pid>+-o+%25cpu,%25mem|code-block|syntax|javascript|1273892|%25cpu,和%25mem之间没有空格。|offset|length|style|CODE|1273893|entityMap^0|0|0|0|5|6|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

For those who struggled for a while wonderring why the selected answer does not work:

<pre><code>ps -p &lt;pid&gt; -o %cpu,%mem
</code></pre>

No SPACE ibetween <code>%cpu,</code> and <code>%mem</code>.

blocks|key|1273297|text|要只获取应用程序的内存使用情况(而不是它使用的共享库，您需要使用Linux+smaps接口)。This+answer+explains+it+well。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1273298|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/860878/tracking-actively-used-memory-in-linux-programs/872456#872456^0|1B|S|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

To get the memory usage of just your application (as opposed to the shared libraries it uses, you need to use the Linux smaps interface). <a href="https://stackoverflow.com/questions/860878/tracking-actively-used-memory-in-linux-programs/872456#872456">This answer explains it well</a>.

blocks|key|1488285|text|(如果您使用的是MacOS+10.10，请尝试top的accumulative+-c选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1488286|top+-c+a+-pid+PID|code-block|syntax|javascript|1488287|(此选项在其他linux中不可用，已在Scientific+Linux+el6和RHEL6中试用)|1488288|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

(If you are in MacOS 10.10, try the accumulative -c option of top:

<pre><code>top -c a -pid PID
</code></pre>

(This option is not available in other linux, tried with Scientific Linux el6 and RHEL6)

blocks|key|1273664|text|ps+aux%7Cawk++'{print+$2,$3,$4}'%7Cgrep+PID|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1273665|其中第一列是PID、第二列CPU使用率、第三列内存使用率。|unstyled|1273666|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>ps aux|awk '{print $2,$3,$4}'|grep PID
</code></pre>

where the first column is the PID,second column CPU usage ,third column memory usage.

blocks|key|1273724|text|ps+axo+pid,etime,%25cpu,%25mem,cmd+%7C+grep+'processname'+%7C+grep+-v+grep|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1273725|PID+-进程ID|unstyled|1273726|etime+-进程运行/活动持续时间|1273727|%25cpu+-+CPU使用率|1273728|内存使用率%25|1273729|cmd+-命令|1273730|将processname替换为您想要跟踪的任何进程，mysql+nginx+php-fpm等...|1273731|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<pre><code>ps axo pid,etime,%cpu,%mem,cmd | grep 'processname' | grep -v grep
</code></pre>

PID - Process ID

etime - Process Running/Live Duration

%cpu - CPU usage

%mem - Memory usage

cmd - Command

Replace processname with whatever process you want to track, mysql nginx php-fpm etc ...

blocks|key|1273844|text|此处的所有答案仅显示PID的内存百分比。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1273845|以下是如何获取所有apache进程的rss内存使用量(+KB+)的示例，如果您只想查看特定的PID，请将"grep+apache“替换为"grep+PID”：|1273846|watch+-n5+"ps+aux+-y+%7C+grep+apache+%7C+awk+'{print+\$2,\$6}'"|code-block|syntax|javascript|1273847|这将打印：|1273848|Every+5.0s:+ps+aux+-y+%7C+grep+apache+%7C+awk+'{print+$2,$6}'++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Thu+Jan+25+15:44:13+2018

12588+9328
12589+8700
12590+9392
12591+9340
12592+8700
12811+15200
15453+9340
15693+3800
15694+2352
15695+1352
15697+948
22896+9360|1273849|使用CPU%25：|1273850|watch+-n5+"ps+aux+-y+%7C+grep+apache+%7C+awk+'{print+\$2,\$3,\$6}'"|1273851|输出：|1273852|Every+5.0s:+ps+aux+-y+%7C+grep+apache+%7C+awk+'{print+$2,$3,$6}'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Thu+Jan+25+15:46:00+2018

12588+0.0+9328
12589+0.0+8700
12590+0.0+9392
12591+0.0+9340
12592+0.0+8700
12811+0.0+15200
15453+0.0+9340
15778+0.0+3800
15779+0.0+2352
15780+0.0+1348
15782+0.0+948
22896+0.0+9360|1273853|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

All of the answers here show only the memory percentage for the PID. 

Here's an example of how to get the rss memory usage in KB for all apache processes, replace "grep apache" with "grep PID" if you just want to watch a specific PID:

<pre><code>watch -n5 "ps aux -y | grep apache | awk '{print \$2,\$6}'"
</code></pre>

This prints:

<pre><code>Every 5.0s: ps aux -y | grep apache | awk '{print $2,$6}' 
Thu Jan 25 15:44:13 2018

12588 9328
12589 8700
12590 9392
12591 9340
12592 8700
12811 15200
15453 9340
15693 3800
15694 2352
15695 1352
15697 948
22896 9360
</code></pre>

With CPU %:

<pre><code>watch -n5 "ps aux -y | grep apache | awk '{print \$2,\$3,\$6}'"
</code></pre>

Output:

<pre><code>Every 5.0s: ps aux -y | grep apache | awk '{print $2,$3,$6}' 
Thu Jan 25 15:46:00 2018

12588 0.0 9328
12589 0.0 8700
12590 0.0 9392
12591 0.0 9340
12592 0.0 8700
12811 0.0 15200
15453 0.0 9340
15778 0.0 3800
15779 0.0 2352
15780 0.0 1348
15782 0.0 948
22896 0.0 9360
</code></pre>

blocks|key|1488636|text|这是一个很好的技巧，可以实时跟踪一个或多个程序，同时还可以查看其他工具的输出：watch+"top+-bn1+-p$(pidof+foo),$(pidof+bar);+tool"|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1488637|entityMap^0|13|1E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

This is a nice trick to follow one or more programs in real time while also watching some other tool's output:
 <code>watch "top -bn1 -p$(pidof foo),$(pidof bar); tool"</code>

blocks|key|1273787|text|上面列出了消耗cpu和内存最多的进程|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1273788|++++++++ps+axo+%25cpu,%25mem,command+%7C+sort+-nr+%7C+head|code-block|syntax|javascript|1273789|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Above list out the top cpu and memory consuming process

<pre><code> ps axo %cpu,%mem,command | sort -nr | head
</code></pre>

blocks|key|1274056|text|基于@Neon的回答，我的两点看法如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1274057|pidstat+-h+-r+-u+-v+-p+$(ps+aux+%7C+grep+<process+name>+%7C+awk+'{print+$2}'+%7C+tr+'\n'+',')|code-block|syntax|javascript|1274058|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Based on @Neon answer, my two cents here:
<pre class="lang-sh prettyprint-override"><code>pidstat -h -r -u -v -p $(ps aux | grep &lt;process name&gt; | awk '{print $2}' | tr '\n' ',')
</code></pre>

blocks|key|1488847|text|基于this+answer，我们可以通过使用sampling+period+T收集N+samples来估计特定进程在特定时间量内的平均CPU和内存利用率，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1488848|N=3;
T=1;
PROCESS_NAME="my_proc";

top+-b+-c+-n+$(let+tmp=N%2B1;+echo+$tmp)+-d+${T}+-p+$(pgrep+${PROCESS_NAME})+%7C+
grep+${PROCESS_NAME}+%7C++
tee+/var/tmp/foo.log+%7C
tail+-n+%2B2+%7C+
awk+-v+N=$N+'BEGIN{
++++++++++++++++c=0;+
++++++++++++++++m=0
++++++++++++}{
++++++++++++++++c=c%2B$9;+
++++++++++++++++m=m%2B$10
++++++++++++}END{
++++++++++++++++printf("%25s+%25s\n",+c/N,+m/N)+
++++++++++++}';|code-block|syntax|javascript|1488849|为了能够评估结果，我们将top的输出收集到/var/tmp/foo.log文件中。预期输出如下所示：|1488850|2.33333+6.9|1488851|和我们日志文件的内容：|1488852|196918+root++++++20+++0+++24.4g+++1.3g+113872+S+++0.0+++6.9++39:58.15+my_proc
196918+root++++++20+++0+++24.4g+++1.3g+113872+S+++2.0+++6.9++39:58.17+my_proc
196918+root++++++20+++0+++24.4g+++1.3g+113872+S+++3.0+++6.9++39:58.20+my_proc
196918+root++++++20+++0+++24.4g+++1.3g+113872+S+++2.0+++6.9++39:58.22+my_proc|1488853|请注意，我们忽略(tail+-n+%2B2)+top命令的第一次执行。|1488854|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/52751050/2194843^0|M|H|15|9|2|B|0|0|0|L|G|0|0|0|0|9|A|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1E|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1F|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1G|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

Based on <a href="https://stackoverflow.com/a/52751050/2194843">this answer</a> we can estimate the average CPU and memory utilization of a specific process for a specific amount of time by collecting <code>N samples</code> with <code>sampling period T</code> as follows:
<pre><code>N=3;
T=1;
PROCESS_NAME=&quot;my_proc&quot;;

top -b -c -n $(let tmp=N+1; echo $tmp) -d ${T} -p $(pgrep ${PROCESS_NAME}) | 
grep ${PROCESS_NAME} | 
tee /var/tmp/foo.log |
tail -n +2 | 
awk -v N=$N 'BEGIN{
 c=0; 
 m=0
 }{
 c=c+$9; 
 m=m+$10
 }END{
 printf(&quot;%s %s\n&quot;, c/N, m/N) 
 }';
</code></pre>
In order to be able to evaluate the results we are collecting the output of the top into the <code>/var/tmp/foo.log</code> file. The expected output is something like this:
<pre><code>2.33333 6.9
</code></pre>
And the content of our log file:
<pre><code>196918 root 20 0 24.4g 1.3g 113872 S 0.0 6.9 39:58.15 my_proc
196918 root 20 0 24.4g 1.3g 113872 S 2.0 6.9 39:58.17 my_proc
196918 root 20 0 24.4g 1.3g 113872 S 3.0 6.9 39:58.20 my_proc
196918 root 20 0 24.4g 1.3g 113872 S 2.0 6.9 39:58.22 my_proc
</code></pre>
Note that we ignore (<code>tail -n +2</code>) the first execution of the top command.

I want to get the CPU and memory usage of a single process on Linux - I know the PID. Hopefully, I can get it every second and write it to a CSV using the 'watch' command. What command can I use to get this info from the Linux command-line?

Retrieve CPU usage and memory usage of a single process on Linux?

我想要获得Linux上单个进程的CPU和内存使用情况--我知道PID。希望我每秒都能得到它，并使用'watch‘命令将它写入CSV。我可以使用什么命令从Linux命令行获取此信息？

问在Linux上检索单个进程的CPU使用率和内存使用率？
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