How can I join lines in vi editor..
s/^M// is not working?

(though I can change "space" with a new line
s/ /^M/ this works..)

Warm Regards
Kamalpreet Singh

On a line-by-line basis, of course you would position on a desired line and type J to join the following line to it.

For a global operation, such as to locate each line containing xyz and join the following line to those, then do:

:g/xyz/j

In both cases, by default joined lines will be separated by a single space.

Yes this is working ...but in a restricted way...
I want to cat all lines into one.
I tried ":g/$/j" and this had to be done multiple times to achieve what I wanted.

Solution is Good ..can u suggest a better one liner
Thanks

Warm Regards
Kamalpreet Singh

It is not a vi solution, but this command places all lines of a file on 1:

xargs < myfile

which is the short had way of saying:

cat myfile|xargs

kamalpreet,

nails gave you a good non-vi solution because the task you want of joining all lines of a file would typically be done outside of vi.

Other non-vi solutions ...

Join all lines with no space between:
cat myfile | tr -d "\n"

Join all lines with a space between:
cat myfile | tr "\n" " "

And in vi, for smallish files, you could do a single J command for the number of lines in the file. If your file has 50 lines, then in command mode (not at the colon prompt), do: 50J