GREP:
search some process which 正在运行:
ps -fe|grep "process_name" (fuzzy search)
Kill process:
kill -9 PID_num
print the line and the file_name which included the "chars" in current directory:
grep chars *file_name
grep -r chars *file_name (include sub directory)
grep -r chars /var/log (in special directory and its sun directory)
grep -v chars file_name (反向查找， 把不符合条件的找出来）
grep -l chars file_name (only print file_name)
how to add package in ipython:
import sys
sys.path (view current interpret path)
sys.path.insert(0, 'package_path')
