add du-command 💻

docs/bash.md

@@ -16,4 +16,47 @@ the previous command is due that not all `find` have a delete funcion but with o
 Find and delete with no overhead
 ```bash
 find / -name .DS_Store -print0 | xargs -0 rm
+```
+
+## du
+
+du - estimate file space usage [man-page](https://man7.org/linux/man-pages/man1/du.1.html)
+
+[example How to Get the Size of a Directory in Linux](https://linuxize.com/post/how-get-size-of-file-directory-linux/)
+
+```bash
+sudo du -sh /var
+
+# Output
+85G	/var
+```
+
+```bash
+sudo du -shc /var/*
+
+# Output
+24K	    /var/db
+4.0K	/var/empty
+4.0K	/var/games
+77G	    /var/lib
+4.0K	/var/local
+0	    /var/lock
+3.3G	/var/log
+0	    /var/mail
+4.0K	/var/opt
+0	    /var/run
+196K	/var/spool
+28K	    /var/tmp
+85G	total
+```
+
+```bash
+sudo du -h /var/ | sort -rh | head -5
+
+# Output
+85G	    /var/
+77G	    /var/lib
+75G	    /var/lib/libvirt/images
+75G	    /var/lib/libvirt
+5.0G	/var/cache/pacman/pkg
 ```