1 set 2 set|less 3 PS1='yes master' 4 PS1='yes master, your command is my wish > ' 5 ls 6 echo $PS1 7 PS1='> ' 8 echo PS1 9 echo $PS1 10 echo ${PS1} 11 info bash 12 ls -l 13 size another.jpg 14 size inf1 15 for f in *; do echo $f; done 16 echo * 17 x=* 18 $x 19 x="*" 20 echo $x 21 x=17 22 echo $x 23 x 24 echo x 25 echo $x 26 echo "$x" 27 echo '$x' 28 echo `$x` 29 history > hist5