[regex] How to replace space with comma using sed?

I would like to replace the empty space between each and every field with comma delimiter.Could someone let me know how can I do this.I tried the below command but it doesn't work.thanks.

My command:
:%s//,/


53 51097 310780 1
56 260 1925 1
68 51282 278770 1
77 46903 281485 1
82 475 2600 1
84 433 3395 1
96 212 1545 1
163 373819 1006375 1
204 36917 117195 1

I know it's not exactly what you're asking, but, for replacing a comma with a newline, this works great:

tr , '\n' < file

On Linux use below to test (it would replace the whitespaces with comma)

 sed 's/\s/,/g' /tmp/test.txt | head

later you can take the output into the file using below command:

sed 's/\s/,/g' /tmp/test.txt > /tmp/test_final.txt

PS: test is the file which you want to use

If you want the output on terminal then,

$sed 's/ /,/g' filename.txt

But if you want to edit the file itself i.e. if you want to replace space with the comma in the file then,

$sed -i 's/ /,/g' filename.txt

Try the following command and it should work out for you.

sed "s/\s/,/g" orignalFive.csv > editedFinal.csv

IF your data includes an arbitrary sequence of blank characters (tab, space), and you want to replace each sequence with one comma, use the following:

sed 's/[\t ]+/,/g' input_file

or

sed -r 's/[[:blank:]]+/,/g' input_file

If you want to replace sequence of space characters, which includes other characters such as carriage return and backspace, etc, then use the following:

sed -r 's/[[:space:]]+/,/g' input_file

Inside vim, you want to type when in normal (command) mode:

:%s/ /,/g

On the terminal prompt, you can use sed to perform this on a file:

sed -i 's/\ /,/g' input_file

Note: the -i option to sed means "in-place edit", as in that it will modify the input file.

I just confirmed that:

cat file.txt | sed "s/\s/,/g"

successfully replaces spaces with commas in Cygwin terminals (mintty 2.9.0). None of the other samples worked for me.