> For the complete documentation index, see [llms.txt](https://mmems.gitbook.io/calepin/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mmems.gitbook.io/calepin/operating-systems/linux-unix/unix.md). # Unix ### Security #### Audit — Lynis Scans the system and available software, to detect security issues. Beside security related information it will also scan for general system information, installed packages and configuration mistakes This software aims in assisting automated auditing, software patch management, vulnerability and malware scanning of Unix based systems. It can be run without prior installation, so inclusion on read only storage is no problem (USB stick, cd/dvd). Lynis assists auditors in performing Basel II, GLBA, HIPAA, PCI DSS and SOX (Sarbanes-Oxley) compliance audits. Install: ``` sudo apt-get install lynis ``` Exec: ``` sudo lynis -c sudo grep Warning /var/log/lynis.log sudo grep Suggestion /var/log/lynis.log ``` * * ### Localized folders * `xdg-user-dir` * ### Too many open files ``` lsof | awk '{ print $2; }' | uniq -c | sort -rn | head ``` ``` lsof > ~/Desktop/lsof.log cat ~/Desktop/lsof.log | awk '{ print $2 " " $1; }' | sort -rn | uniq -c | sort -rn | head -20 vim ~/Desktop/lsof.log ``` * [filesystem - Too many open files - how to find the culprit - Ask Ubuntu](http://askubuntu.com/questions/181215/too-many-open-files-how-to-find-the-culprit) ### Selective sync using Dropbox * [Simplify your server using Dropbox, Selective Sync < blog :: buildcontext the personal blog of Ben Hedrington](http://buildcontext.com/blog/2012/dropbox-linux-ubuntu-ec2-linode-selective-sync) ### Find on which physical device a folder is located ``` df /root Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 1043289 194300 795977 20% / ``` ### Live USB drive Live CD, live USB, bootable USB * [UNetbootin - Homepage and Downloads](https://unetbootin.github.io/)