Using the ! operator in IPython

You have a directory full of files you want the size of. You need a technique that will allow you to filter patterns. You want to do this in Python. Use the ! operator to create a command that sums the total size of the files in a directory. The piped command will use this awk snippet awk '{ SUM+=$5} END {print SUM}'. Awk is a tool that is used often on the Unix command line because it understands how to deal with whitespace delimited output from shell commands. The awk command works well at grabbing fields from a string.

Make sure you try the commands out in the IPython terminal!

Possible Answers

!ls | awk '{SUM+=$5} END {print SUM}'
!ls -l | awk '{SUM+=$5} END {print SUM}'
!ls | cat | awk '{SUM+=$5} END {print SUM}'

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Exercise

Using the ! operator in IPython

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