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Thank you for your suggestion.
I learn a lot of things from the reply of you kind mates.
I think it is worth learning because now I have a clearer pirture about what the stuff is going on.:)
...

Thank you very much.This help me a lot.:)
And one more thing that puzzle me is when typing the following commands in bash
echo --versionscreen output --version
echo --helpscreen output --help...

I use #!/bin/bash in my script.

Plus,
bash firstscript.sh output
Hello,World
sh firstscript.sh output
-e Hello,World

echo -e "Hello,World\a\n" goes right when I type it in my bash,but goes wrong when I add it in my shell script.

I got the same output when I type the code above.
-e testing

And if my shell is using posix by default,when I type
echo -eit should print -e ,right?
But it just print a blank line.

By the...

The first command return xpg_echo off

GNU bash, version 4.1.5(1)-release (i686-pc-linux-gnu)

---------- Post updated at 08:09 PM ---------- Previous update was at 07:53 PM ----------

Regarding your problem, perhaps your environment...

I try that and it turn out to return /bin/echo both

Plus,when I type
/bin/echo -e "Hello,world\a\n" in the script ，it work right
Can you tell me why ?

Both of the command return /bin/bash

bash
I typed
#!/bin/bashin the script

---------- Post updated at 11:49 AM ---------- Previous update was at 11:43 AM ----------



Yes, in the description it says
-e enable...

Hi,when I run my first shell script,I got something that doesn't work right.
I wrote this code in the script.
echo -e "Hello,World\a\n"But the screen print like this:

-e Hello,World

The "-e"...