[header] How to set paths, colors, fonts, and aliases on a unix or linux system [title] Remember that unix and linux are case sensitive to settings and commands. [step] Be precise when entering settings. The directory listing command " ls " will not work if you type " ls " or " ls ". 
[substeps] All commands will be listed in their correct case, even at the beginning of a sentence in this article. " unix " will be used to refer to unix or linux.