shift
 case calculator.sh
 bakcup
Merge branch 'master' of https://bitbucket.org/uahoo/shell_script_example
 case in
 bacup
Merge branch 'master' of https://github.com/xueshell-com/shell_script_example
 gitdiff log txt
 backup
 tput
 backup
 bak
 dp.sh
Merge branch 'master' of https://github.com/xueshell-com/shell_script_example
 math