How to replace multiple consecutive spaces with one comma in Linux?

[Moriana]

Can anyone suggest most efficient solution to replace one or more consecutive spaces with one comma?

I am using Linux.

Thanks in advance.

[KelvinSmith]

Hi Moriana,

Give this one-liner a try, this will not replace the spaces at the BOL or EOL

awk -v OFS="," '{$1=$1}7' file

Following line will replace all spaces:

awk '1+gsub(/ +/,",")' file

Another one with sed, this will replace all spaces, including leading and ending ones

sed 's/ \+/,/g' file