Silly bash script programming....
 

How to read a parameter from console?

Like: ./readBash.sh name

then my script print the name out?

Thanks!

$1 is the first argument, $2 is the second one, etc. If you want it all in one string you can use $@ .

and $0 is the name of program or script.

Thanks a lot!

Then how to write some words into a file?

I try to use this format :

<<<lineNum=$1
scp lineNum name@/path/
>readme.txt

But I find the bash recognize the scp as commands, not words in readme.txt.

I'm not sure what you mean by that. scp handles copying files across networks. If you just want to write the command line to a file try

echo $@ > file

which will overwrite the file with the command line, or

echo $@ >> file

which will append the command line to the file

What if I want to write multiple lines into the script?
For example, just simply write two lines into a .txt file?

line=xxx
scp line.txt useer@server:/path/

I'm still confused about the scp. Are you trying to copy files across a network?

This code

line=xxx
scp line.txt useer@server:/path/

Puts the string xxx into the environment variable line, then copies some file named line.txt over a network. If you want to write the command line to the file with each word on it's own line, that would be like this

This says, while there is a first argument, append it (on a new line) onto file.txt. Then forget the first argument, and shift all the other arguments over. So, if the command arguments where "This is some text"
Then

echo $1
shift
echo $1

will print "This is".

I had a $200 headache....

Well, actually I want to generate a .txt file by .sh.

I don't need to redirect I/O or using pipe. It should be simple, just generate a data.txt, which contains these two sentenses....

line=xxx
scp line.txt useer@server:/path/

I think your method is to read two lines, then saved into a txt file. That is advanced level for me right now :) Thanks!

Oh, you wanted the literal text

"line=xxx
scp line.txt useer@server:/path/"

to appear in the file. Haha, now I understand.

Just try

That's easy, thanks!
Anyway, seems go back to the old track but different:
What if xxx is read from console?

For example, the script name is readLine.sh, and I want to run it like:

./readLine.sh 999

As stated before if you run:
from the script it'll print out 999 which you entered in the console. And $2 for the second, $3 for third, etc., and $@ for all.

Try reading a guide on bash, I recommend this one:
http://tldp.org/LDP/abs/html/

It works!

$1 always print the first input item on the console. No matter where it is in the script

Good, glad it works. Also, bash is really quite an easy language to learn, and very powerful too, at least at a high level, you can do many things with just a few simple commands. It took me no more than 1 week to learn the basics, the rest you'll learn as you write more scripts.