To work on Linux platform, you cannot avoid using shell commands to complete some tasks. These tasks can be as simple as list files in some directories or find some text in some file, or can be as complex as monitoring processes. In this post, we will share 37 powerful Linux shell commands. TaskCommands1Delete file with 0 byte(empty file)find . -type f -size 0 -exec rm -rf {} \;find . type f -size 0 -delete2Check process memory consumptionps -e -o "%C : %p : %z : %a"|sort -k5 -nr3Check process CPU utilizetionps -e -o "%C : %p : %z : %a"|sort -nr4Print URLs in cachegrep -r -a jpg /data/cac...

Frequently, we may have an ArrayList which stores many values, and we need to process the ArrayList and get what are the distinct values in the list, or we may want to count occurrence of each value in the ArrayList. We can remove the duplicates in a few ways. Here we propose 3 methods :    public static void main(String[] args){        //SuperClass sub=new SubClass();                String[] ar = { "dd", "c", "dd", "ff", "b", "e", "e" };        ArrayList list ...