Linux下查找java进程的pid
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Find the pid of a java process under Linux
提问by Shweta B. Patil
Hello I am using MPJ library in java program for Pagerank algorithm. I compile it by
您好，我在 Java 程序中使用 MPJ 库进行 Pagerank 算法。我编译它
javac -cp .:$MPJ_HOME/lib/mpj.jar MpiPageRank.java
and run by
并运行
mpjrun.sh -np 2 MpiPageRank
where -npis number of process
-np进程数在哪里
Now i have to find its pid
现在我必须找到它的pid
ps -ef|grep java
like
喜欢
mpjrun.sh -np 2 MpiPageRank & sleep 2
ps -ef | grep java
I get
我得到
pnewaska 27866 27837 99 21:28 pts/45 00:00:09 java -cp /u/pnewaska/mpj-v0_38/lib/smpdev.jar:/u/pnewaska/mpj-v0_38/lib/xdev.jar:/u/pnewaska/mpj-v0_38/lib/mpjbuf.jar:/u/pnewaska/mpj-v0_38/lib/loader2.jar:/u/pnewaska/mpj-v0_38/lib/starter.jar:/u/pnewaska/mpj-v0_38/lib/mpiExp.jar runtime.starter.MulticoreStarter /nfs/nfs1/home/pnewaska/DistributedSystems/Project3 10 smpdev useLocalLoader EMPTY MpiPageRank -i input.500k0 -n 10 -o
Now I want to extract MpiPageRankfrom only 1 linux comman to get its pid ie 27866.
how do i do that ?
现在我只想MpiPageRank从 1 个 linux comman 中提取以获取其 pid ie 27866。我怎么做 ？
回答by Abdullah Jibaly
You can use awk to get the pid:
您可以使用 awk 来获取 pid：
ps -ef | grep MpiPageRank | awk '{print }'
I noticed that sometimes grep itself gets found, to remove it:
我注意到有时会找到 grep 本身，以将其删除：
ps -ef | grep MpiPageRank | grep -v grep | awk '{print }'
回答by c00kiemon5ter
using ps
使用 ps
psallows the user to define his own formatting for its output with the -oswitch, and -Cto select entries by the given command. I would go with:
ps允许用户使用-o开关为其输出定义自己的格式，并-C通过给定的命令选择条目。我会去：
ps -C java -o pid
from the man page:
从手册页：
-C cmdlist ? ? ?Select by command name
This selects the processes whose executable name is given in cmdlist.
-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.
One can get more accurate results by specifying more restrictions (ie the user under which the process runs, etc). Look at the man page for more information and other switches.
可以通过指定更多限制（即进程运行的用户等）来获得更准确的结果。查看手册页以获取更多信息和其他开关。
example:
例子：
$ sleep 10 &
[1] 12654
$ ps -C sleep -o pid
12654
using the shell
使用外壳
I don't know why you use an .shscript to run your code and not call javadirectly, but if in any case you use the &(background) operator, you can grab the pidthrough your shell, with the $!variable.
我不知道为什么你使用.sh脚本来运行你的代码而不是java直接调用，但是如果你在任何情况下使用&（后台）运算符，你都可以pid通过你的 shell获取$!变量。
for example:
例如：
$ sleep 5 &
[1] 12395
$ echo $!
12395
same goes for the java -jar .. &command, $!will be set to the pid of the last backgrounded job.
这同样适用于java -jar .. &命令，$!将被设置为最后转到后台作业的PID。
回答by Jesan Fafon
jps is the same as ps except it only looks at java processes.
jps 与 ps 相同，只是它只查看 java 进程。
If you then need the PID, you can do something like the following:
如果您随后需要 PID，您可以执行以下操作：
jps | grep JAVA_NAME | awk '{print }'
That runs jps, then uses grep to filter by the java application or jar you want to kill. After that, awk captures and prints just the pid to the console.
运行 jps，然后使用 grep 过滤你想要杀死的 Java 应用程序或 jar。之后，awk 只捕获 pid 并将其打印到控制台。
回答by Eusuf Kanchwala
A simple way is to run this:
一个简单的方法是运行这个：
pgrep java
回答by pratap
ps -ef | grep java | grep MpiPageRank | grep -v grep | awk '{print $2}'
ps -ef | grep java | grep MpiPageRank | grep -v grep | awk '{print $2}'
This will return exact pid of the MpiPageRank out of all java processes running
这将返回所有运行的 Java 进程中 MpiPageRank 的确切 pid
