Exercise 4

Change the script for Example 4-3 to print the total size of files in kb for each directory and the sum for all directories. Use let command to do the required computation.
Change the script for Example 4-3 to print number of waveform files for each station for a given event.

Change the script for Example 4-3 to print the total size of files in kb for each directory and the sum for all directories. Use let command to do the required computation.