Editing Linux commands (section)

=== System disk space usage  ===
hard disk usage
* [http://linux.about.com/od/commands/l/blcmdl1_df.htm df command] "disk space usage" for {{Linux}} {{kbd | key = <nowiki>df -h</nowiki>}}
* [http://linux.about.com/library/cmd/blcmdl1_du.htm du command] "estimate file space usage" of specific folder for {{Linux}} 
** {{kbd | key = <nowiki>du -h /path/to/folder/</nowiki>}} Detailed output of hard disk usage of specific folder and child folders. e.g. {{kbd | key = <nowiki>du -h /home | sort -rn > 
~/disk.txt</nowiki>}}
** {{kbd | key = <nowiki>du -hcs /path/to/folder/</nowiki>}} Brief output of total hard disk usage.
** {{kbd | key = <nowiki>du --max-depth=1 -B M /path/to/folder/ | sort -g</nowiki>}}<ref>[http://blog.xuite.net/chingwei/blog/32566618-%E3%80%90%E7%B3%BB%E7%B5%B1%E3%80%91%E4%BD%BF%E7%94%A8+du+%E4%BE%86%E7%9C%8B%E7%A3%81%E7%A2%9F%E7%9A%84%E4%BD%BF%E7%94%A8%E7%A9%BA%E9%96%93 【系統】使用 du 來看磁碟的使用空間 @ My Life :: 隨意窩 Xuite日誌]</ref>Output example:
<pre>
0M      /sys
1M      /tmp
9M      /run
27M     /etc
36M     /root
165M    /boot
1647M   /usr
49287M  /var
51379M  /home
102547M /
</pre>

[https://www.cyberciti.biz/faq/how-do-i-find-the-largest-filesdirectories-on-a-linuxunixbsd-filesystem/ How To Find Largest Top 10 Files and Directories On Linux / UNIX / BSD - nixCraft] {{exclaim}} It may costs time to return the result if there are too many file under the specified path. Output example of {{kbd | key = <nowiki>du -a -BM /path/to/folder/ | sort -n -r | head -n 10</nowiki>}}:
<pre>
# du -a -BM /var/ | sort -n -r | head -n 10
11199M  /var/
10384M  /var/lib
6336M   /var/lib/mysql
3714M   /var/lib/strong-pm
3661M   /var/lib/strong-pm/svc
2042M   /var/lib/strong-pm/svc/1/work
2042M   /var/lib/strong-pm/svc/1
1619M   /var/lib/strong-pm/svc/2/work
</pre>

Options cited from the content of Linux man page<ref>[http://linuxcommand.org/lc3_man_pages/du1.html du man page]</ref>
* {{kbd | key=<nowiki>-a, --all</nowiki>}} "write counts for all files, not just directories"
* {{kbd | key=<nowiki>-B, --block-size=SIZE</nowiki>}} "scale sizes by SIZE before printing them"