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this is a blog to track what i had learned and share knowledge with all who can take advantage of them i want to kill a whole process tree. what is the best way to do this using any common scripting languages? i am looking for a simple you don't say if the tree you want to kill is a single process group. (this is often the case if the tree is the result of forking from a server start or a shell command line.) you can discover process groups using gnu ps as follows:  if it is a process group you want to kill, just use the kill(1) command but instead of giving it a process number, give it the negation of the group number. for example to kill every process in group 5086, use kill -term -- -5086 that is commonly seen in spreadsheets and other programs that operate on tabular data. the pivot table takes simple columnwise data as input, and groups the entries into a two-dimensional table that provides a multidimensional summarization of the data. the difference motivating pivot tables  for the examples in this section, we’ll use the database of 1         1       1  female  38.0      1      0  71.2833        c  first  woman       false    c    cherbourg   yes  false   2         1       3  female  26.0      0      0   7.9250        s  third  woman       false  nan  southampton   yes   true   3         1       1  female  35.0      1      0  53.1000        s  first  woman       false    c  southampton   yes  false   4         0       3    male  35.0      0      0   8.0500        s  third    man        true  nan  southampton    no   true   this contains a wealth of information on each pas*enger of that ill-fated voyage, including gender, age, clas*, fare paid, and much pivot tables by hand  to start learning more about this data, we might begin by grouping it