I’m not an expert at all with the linux shell. I know how to run a LAMP stack, but that is about it. Every blue moon I need to use a command that I used last blue moon, but forgot how. This list will now be my list to write down the cool “commands” I learn to accomplish different tasks. That way I don’t have to bug people on #uphpu about it. 
- How many files in a folder? - ls -1 | wc -l
- How much disk space is a folder taking up? – du -sh .
- Truncate/Empty a file – cat /dev/null > file.log
I’ll keep adding to the list as I continue my work with Linux.
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To empty a file you may try also a shorter
“> file.log”