blank Create a variable mydata and assign the value /home/hopper/berezin/data. _______
mydata="/home/hopper/berezin/data"
mydata=/home/hopper/berezin/data

blank Make the variable mydata a global variable. ____________
export mydata

blank What shell variable determines the size of the history list? ____________
HISTSIZE

blank What shell variable determines size of the saved history list when exiting a shell?   ____________
HISTFILESIZE

blank What shell variable sets the command line prompt? ____________
PS1

blank On a singl line, run cmd1 then cmd2 sequentially in the foreground. ____________
cmd1; cmd2

blank On a single line, run cmd1 and cmd2 concurrently, both in the background. ____________
cmd1& cmd2&

blank On a single line, run cmd1 then cmd2 but only if cmd1 runs successfully. ____________
cmd1 && cmd2

blank On a single line, run cmd1 then cmd2 but only if cmd1 returns a failure status. ____________
cmd1 || cmd2

Assume that line 23 in the history list contains. 

less /home/hopper/berezin/data/d1.s1

blank 10. Use history mechanism to recall the 23rd command entered in the history list. ____________
!23

blank Use history mechanism to recall the just the path to d1.s1. ____________
echo  !23:1:h

blank Use history mechanism to recall just the main filename, no path, not extension. ____________
echo  !23:1:t:r

blank define the "ls" alias to run ls -l and pipe it to the less command. ____________
alias ls="ls -l | less"

blank Use redirection to append the output of the command cmd1 to the file data. ____________
cmd1 > data

blank Use redirection to send error messages from cmd1 to the file oops. ____________
cmd1 2> oops

blank Use redirection to redirect standard input into sort until the word done is entered. ____________
sort << done