If I'm looking for the main shell, I would generally set it to a variable first so its clear that's the one I want. If you have more than one required process, this command. Which one is correct? It depends on what you are trying to do. The basic technique is to use the ps -ef grep targetprocess grep -v grep command syntax. Scripts do this sort of thing all the time, see how the first has 3 lines but the second has only 2? This is because the first we are resolving $$ then running the script and finding out "main" shell, but the second we are doing it the other way which of course has a different PID of the child shell and doesn't match the 3802 of the parent. However, you have to be really careful of $$ in scripts because it means "this shell" but the concept of this depends on when and where it is called.Ĭonsider the two commands: $ sh -c "ps -ax | grep $$"ģ658110 pts/0 S+ 0:00 sh -c ps -ax | grep 3802ģ658142 pts/0 S+ 0:00 sh -c ps -ax | grep $$ The fgrep command on the other hand works on fixed string instead of a regex. simple selection selection by list -A all processes -C by command name -N negate selection -G by real group ID (supports names) -a all w/ tty except session leaders. The egrep command allows the use of extended regex. commandps -ef grep java exit code: 1 ERROR: Garbage option. The -h option is to remove the header line. This is the output I got when I executed the command as ps -ef grep java. ps takes the PIDs of the processes you are interested in as command line options so if you know what you want, specify it directly, rather than hope the grep will work. Something as simple as ps -h $$ > catch will probably do it. When -f is set, the full command line is used. pgrep -f keyword From the man page: -f The pattern is normally only matched against the process name. Ps -ef command in UNIX: This command is used to find the PID (Process ID, Unique number of the process) of the process. It does not execute the ps command, store the result in memory, and them pass it to grep. Linux then maps the standard output (STDOUT) of 'ps -ef' to the standard input (STDIN) of the grep command. 13066 is the process ID of the tomcat in this example. What you had psresult (ps -efgrep exe) runs ps grep, and captures the output. Linux is executing the 'grep' command before the ps -ef command. That makes pgrep match keywords in the whole command (including arguments) instead of just the process name. Alternatively, a more simple way is to use the jcmd command from the SDK which will directly print out the process ID of all the JVM processes likes: 20720 jdk.jcmd/ 13066 .Bootstrap start. then - filter down using grep to a single process, which you had in step 1 287 You can use pgrep as long as you include the -f options. plus - all other process that don't have a tty too (x option).plus - all other processes which have a tty (a option).ps -ef fzf -bind ctrl-r:reload(ps -ef) -header Press CTRL-R to reload -header-lines1. Here is the script I wrote basically to check for validating multiple process running on the server.This is not a good way of doing things. fzf is a general-purpose command-line fuzzy finder. Root 45943 1 0 Apr12 ? 00:17:47 /opt/xenon/sganet/agent/lib64/sganetwatchdog -vm=/opt/xenon/sganet/agent/lib64/sganetos -logdir /opt/xenon/sganet/log -ini. ps aux returns the full command line of each process, while pgrep only looks at the names of the executables. Venom 3157 95310 0 23:08 pts/5 00:00:00 grep -color=auto xenon ps aux includes the full command line (path and parameters), while pgrep only looks at the first 15 characters of the executables names. On server, some reason I see no o/p for pgrep, which will resolve my challenge. I am going to use RMAN Active Database Duplicate command to create a PHYSICAL STANDBY. When i am running as ps -ef | grep -v $$ | grep xenon, I am getting asįor more details see ps(1). ps -ef grep -i mrp SQL>select process, thread, sequence. 1 Answer Sorted by: 31 -e and -f are options to the ps command, and pipes take the output of one command and pass it as the input to another. But challenge is, the keyword I am using is not the userid, it's part of the o/p or ps command. I need to check whether a process is running or not on server.
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