Linux

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Users

• http://www.cyberciti.biz/faq/howto-linux-add-user-to-group/

usermod example - Add a existing user to existing group

Add existing user tony to ftp supplementary/secondary group with the usermod command using the -a option ~ i.e. add the user to the supplemental group(s). Use only with -G option:
# usermod -a -G ftp tony

In this example, change tony user's primary group to www, enter:
# usermod -g www tony

CMD Tips

• http://ebeab.com/2013/12/29/command-line-basics-and-tips
• http://files.fosswire.com/2007/08/fwunixref.pdf

sort file1.txt file2.txt | uniq -u > uniq_lines.txt

Alocate file system to user

tune2fs