sh命令未调用shell脚本

Question

I've written a simple shell script that adds some aliases to a shell it is executed as part of an assignment for school. Here is the contents of the file testscript.txt :

#!/usr/bin

alias dir="ls -l"
alias alerts="cat /etc/motd"
PS1="What next Matt ? "

When I use the following command:

sh testscript.txt

The command appears to run since no errors are returned, however, the alias and command prompt variables have not been changed.

I know that the script works properly because I have tried the following three alternatives, which all worked without a hitch:

. ./testscript.txt
. testscript.txt
source testscript.txt

The assignment requires that I use the sh command. Any suggests to make the command update the aliases and environmental variables?

Here is a screenshot of the assignment so you can see the requirements I must fulfil:

Thank you for you time and help.

Answer 1

Any environment variables you set up inside a stand-alone script will only be visible from within that script. instead, you need to add these commands to ~/.profile (or whatever its equivalent is on your system). Then they will be executed when you log into the command line console.

Answer 2

The shebang (first line) is not correct.

In your case, you should replace the first line by either #!/bin/sh or #!/bin/bash .

Just search for 'shebang' in Google. It is basically the absolute path of the launched executable. http://en.wikipedia.org/wiki/Shebang_(Unix)