I have been working in bash, and need to create a string argument. bash is a newish for me, to the point that I dont know how to build a string in bash from a list.

// foo.txt is a list of abs file names.

```
/foo/bar/a.txt
/foo/bar/b.txt
/delta/test/b.txt

```

should turn into: `a.txt,b.txt,b.txt`

OR: `/foo/bar/a.txt,/foo/bar/b.txt,/delta/test/b.txt`

code

```
s = ""
for file in $(cat foo.txt);
do
    #what goes here?    s += $file  ?
done

myShellScript --script $s

```

I figure there was an easy way to do this.