通过命令行在 Linux 中查找进程数
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Finding process count in Linux via command line
提问by Traker
I was looking for the best way to find the number of running processes with the same name via the command line in Linux. For example if I wanted to find the number of bash processes running and get "5". Currently I have a script that does a 'pidof ' and then does a count on the tokenized string. This works fine but I was wondering if there was a better way that can be done entirely via the command line. Thanks in advance for your help.
我一直在寻找通过 Linux 中的命令行查找具有相同名称的正在运行的进程数量的最佳方法。例如，如果我想找到正在运行的 bash 进程的数量并获得“5”。目前我有一个脚本，它执行 'pidof '，然后对标记化的字符串进行计数。这工作正常，但我想知道是否有更好的方法可以完全通过命令行完成。在此先感谢您的帮助。
采纳答案by David Z
On systems that have pgrepavailable, the -coption returns a count of the number of processes that match the given name
在pgrep可用的系统上，该-c选项返回与给定名称匹配的进程数的计数
pgrep -c command_name
Note that this is a grep-style match, not an exact match, so e.g. pgrep shwill also match bashprocesses. If you want an exact match, also use the -xoption.
请注意，这是一个grep-style 匹配，而不是完全匹配，因此 egpgrep sh也将匹配bash进程。如果您想要完全匹配，也可以使用该-x选项。
If pgrepis not available, you can use psand wc.
如果pgrep不可用，您可以使用ps和wc。
ps -C command_name --no-headers | wc -l
The -Coption to pstakes command_nameas an argument, and the program prints a table of information about processes whose executable name matches the given command name. This is an exact match, not grep-style. The --no-headersoption suppresses the headers of the table, which are normally printed as the first line. With --no-headers, you get one line per process matched. Then wc -lcounts and prints the number of lines in its input.
该-C选项ps需要command_name作为参数，该程序将打印信息表，谁的可执行文件名给定的命令名称相匹配的过程。这是完全匹配，而不是grep风格。该--no-headers选项禁止表格的标题，通常打印为第一行。使用--no-headers，每个匹配的进程都会得到一行。然后wc -l计算并打印其输入中的行数。
回答by Amardeep AC9MF
result=`ps -Al | grep command-name | wc -l`
echo $result
回答by Alex B
ps -Al | grep -c bash
回答by Sury Soni
Following bash script can be run as a cron job and you can possibly get email if any process forks itself too much.
以下 bash 脚本可以作为 cron 作业运行，如果任何进程分叉太多，您可能会收到电子邮件。
for i in `ps -A -o comm= --sort=+comm | uniq`;
do
if (( `ps -C $i --no-headers | wc -l` > 10 )); then
echo `hostname` $i `ps -C $i --no-headers | wc -l` ;
fi
done
Replace 10 with your number of concern.
将 10 替换为您关注的号码。
TODO: "10" could be passed as command line parameter as well. Also, few system processes can be put into exception list.
TODO：“10”也可以作为命令行参数传递。此外，很少有系统进程可以放入例外列表。
回答by Niall O Shea
Some of the above didn't work for me, but they helped me on my way to this.
上面的一些方法对我不起作用，但它们在我实现这一目标的过程中帮助了我。
ps aux | grep [j]ava -c
For newbies to Linux:
对于 Linux 新手：
ps auxprints all the currently running processes, grepsearches for all processes that match the word java, the []brackets remove the process you just ran so it wont include that as a running process and finally the -coption stands for count.
ps aux打印所有正在运行的进程，grep为匹配词，所有的进程搜索的Java中，[]括号中移除刚才跑得那么它不会有，作为一个正在运行的进程，最后的处理-c选项代表计数。
回答by Bhagya Prasad NR
You can try :
你可以试试 ：
ps -ef | grep -cw [p]rocess_name
OR
或者
ps aux | grep -cw [p]rocess_name
For e.g.,:
例如：
ps -ef | grep -cw [i]nit
回答by fraff
List all process names, sort and count
列出所有进程名称，排序和计数
ps --no-headers -A -o comm | sort | uniq -c
You also can list process attached to a tty
您还可以列出附加到 tty 的进程
ps --no-headers a -o comm | sort | uniq -c
You may filter with:
您可以过滤：
ps --no-headers -A -o comm | awk '{ list[] ++ } END { for (i in list) { if (list[i] > 10) printf ("%20s: %s\n", i, list[i]) } }'
回答by BreakBadSP
You can use ps(will show snapshot of processes) with wc(will count number of words, wc -loption will count lines i.e. newline characters).
Which is very easy and simple to remember.
您可以使用ps（将显示进程的快照）与wc（将计算单词数，wc -l选项将计算行数，即换行符）。这很容易记住。
ps -e | grep processName | wc -l
ps -e | grep processName | wc -l
This simple command will print number of processes running on current server.
If you want to find the number of process running on current server for current user then use -Uoption of ps.
这个简单的命令将打印当前服务器上运行的进程数。如果您想了解当前服务器上运行的当前用户进程的数量，然后使用-U的选项ps。
ps -U root | grep processName | wc -l
ps -U root | grep processName | wc -l
change root with username.
用用户名更改root。
But as mentioned in lot of other answers you can also use ps -e | grep -c process_namewhich is more elegant way.
但是正如许多其他答案中提到的，您也可以使用ps -e | grep -c process_name哪种更优雅的方式。
回答by spoorthi vaidya
ps aux | wc -l
ps aux | wc -l
This command shows number of processes running on the system by all the users.
此命令显示所有用户在系统上运行的进程数。
For a specific user you can use the following command:
对于特定用户，您可以使用以下命令：
ps -u <username> | wc -l
ps -u <username> | wc -l
replace with the actual username before running :)
在运行之前替换为实际用户名:)
