![]() ![]() Number 9 signal - KILL (non-catchable, non-ignorable kill)Įxample: ps -ef | grep -e node -e loggerUploadService.sh -e applicationService. Xargs - construct argument list(s) and execute utility Specify multiple patterns, or when a pattern begins with a dash This option is most useful when multiple -e options are used to Line is selected if it matches any of the specified patterns. The reason is simple: cat supposed to read from its stdin and finish, once the stdin is closed. Specify a pattern used during the search of the input: an input 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. You will not find pid for cat if you run it like this: cat >my1.fifo &. ![]() The grep utility searches any given input files, selecting lines that f Display the uid, pid, parent pid, recent CPU usage, process start linux - grepping output of ps, exclude the word grep Web28 ta Apr 2021 The ps command can be. e Display information about other users' processes, including those Quoting within (command substitution) in Bash. Information about all of your processes that have controlling terminals. Ps utility displays a header line, followed by lines containing One way to exclude the grep line from ps output is to use an additional grep with the -v option to invert the search: ps grep vi grep -v grep. The solution would be filtering the processes with exact pattern, parse the pid, and construct an argument list for executing kill processes: ps -ef | grep -e -e -e | In case grep returns no lines (grep return code 1), I abort the script if I get 1 line I invoke A () or B () if more than 1 line. detail about the process created by thi grep command. When you run the above command it will show you atleast one line of output i.e. You may match the number of lines or time for which its running and compare with zero or any other manipulation. ![]() Just omit the -q from the grep command and let the output be written.In bash, using only the basic tools listed in your question (1), you should be able to do: kill $(ps aux | grep 'ython csp_build.py' | awk '' | xargs sudo kill -klevel ps aux grep -i abc will show the details of the process if its running. To ignore the case when searching, invoke grep with the -i option. This means that the uppercase and lowercase characters are treated as distinct. If you are actually using echo $(cmd) intentionally to squash whitespace or are using flags in the output of cmd, you have a code readability issue!) In this case, there is an easier solution than using echo here, though. The -w option tells grep to return only those lines where the specified string is a whole word (enclosed by non-word characters). grep -q string file, in backticks (or inside (.), which is preferable ), will be replaced by the output of grep. ( echo will squeeze whitespace and perhaps treat some of the output of cmd as flags, so the output is not always identical, but it is almost always what you want. Instead of echo $(cmd), you can almost always just do cmd and cut out the middle man. If you run Debian or Ubuntu (Linux), iperf can be installed by executing. The $() gathers the output of cmd and passes it as arguments to echo, which then writes them. In your original code, you have the line echo $(cat test.txt | grep '$searchT'), which has several issues, but I will just address the anti-pattern echo $(cmd). Note that you should use double quotes so that "$searchT" is expanded and its value is passed as the argument to grep, and there is no need for cat. Let’s see the basic working of the ps -ef command by executing the script: ps -ef The output shows a list of processes. So you probably just want to do: if grep -q -wi "$searchT" test.txt then The ps -ef command displays a list of processes, with each process occupying one line. ![]() grep succeeds if it matches, and fails if it does not. It's not precisely clear what you are trying to match, but remember that if takes a command and evaluates its returns value. ![]()
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