Tools and Tutorials  

Useful Linux Commands 

1. Find all the files in the with extension .py and copy them into an existing folder ~/projects/scripts
   
   

find  . -name "*.py" -exec cp "{}"  ~/projects/scripts \; 

2. Copy all the data files excluding some files like  .dcd,  .BAK .ppm 

rsync -avr --exclude='*.BAK' --exclude='*.dcd' --exclude='*.ppm' /home/hjoshi /run/media/hjoshi/ 

3. Fine all the files having extension .png in the directory your_folder

find  {your_folder} -name "*.png" 

 4. Add some_text to the beginning of all the lines in a file input_file 

      sed -i -e 's/^/some_text /'  input_file 

5. Add some_text to the end of all the lines in a file input_file 

     sed -i s/$/\ \ some_text /  input_file