Linux cheat sheet

Find the number of files in a folder
```
ls | wc -l
```
Find the size of folders
```
 du -h --max-depth=1 foldername
```
Find and remove empty folders
```
find . -type d -empty -exec rmdir {} \;
```
Kill a zombie process
- To find the ppid of zombie process
```
ps -aux |grep -w Z
kill -9 ppid
```
- if not working, kill the parent process
```
cat /proc/{pid of zombie}/status | grep -i ppid
```