Bash Proficiency In Under 15 Minutes Bash Proficiency In Under 15 Minutes Cheat sheet and in-depth explanations located below main article contents… The UNIX shell program interprets user commands, which are… Bash Proficiency In Under 15 Minutes Cheat sheet and in-depth explanations located below main article contents… The UNIX shell program interprets user commands, which are either directly entered by the user, or which can be read from a file called the shell script or shell program. Shell scripts are interpreted, not compiled. The shell reads commands from the script line per line and searches for those commands on the system while a compiler converts a p