shell variable shell variable shell variable shell variable bash shell variable shell variable bash shell variable list of all commonly used shell variables shell variable bash shell variable Bash shell variables bash shell variable weekday into a shell variable bash shell variable shell variable bash shell variable shell variable bash shell variable bash shell variable shell variable shell variable shell variable shell variable shell variable shell variable shell variable shell variable shell variable bash shell variable shell variable shell variable shell variables bash shell variable bash shell variable shell variable scripts examine the shell variable called PS1 shell variable shell variable shell variable bash shell variable shell variable