vim/sed 按列删除空格

Question

i have a CSV file with 3 columns. It looks like this

col1,col2,col3
123,abc , 2015-01-01
246,def , 2015-02-02

How can i remove the white space in col3 only using vim/sed?

expected output:

col1,col2,col3
123,abc ,2015-01-01
246,def ,2015-02-02

Answer 1

vim

In vim, this command works for your example:

%s/,[^,]*$/\=substitute(submatch(0)," ","","g")

Answer 2

$ cat foobar.csv
col1,col2,col3
123,abc , 2015-01-01
246,def , 2015-02-02

$ sed 's/\(.*\),\(.*\),\(\s*\)\(.*\)/\1,\2,\4/' foobar.csv
col1,col2,col3
123,abc ,2015-01-01
246,def ,2015-02-02

Remember the -i flag if you want to edit the file in place.