How can I print the list of groups in just one line with commas between them?

Question

for example this script gives me the list of groups but each group is in a line

for group in `groups`                                                                                                   do
        echo "$group,"

done

The objective is to put them like this :group1,group2,group3. Instead of :

group1,
group2,
group3

When you call `groups` without the for loop, what is your output? Each group on a new line, or with spaces in between? — Walter A, Jul 17 '21 at 21:45

score 2 · Answer 1 · answered Jul 17 '21 at 12:30

2

So just replace spaces with comma.

groups | tr ' ' ','

answered Jul 17 '21 at 12:30

KamilCuk

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score 1 · Answer 2 · answered Jul 17 '21 at 14:29

1

Or another simple alternative is to use sed and a global substitution of ' ' with ',', e.g.

groups | sed 's/ /,/g'

answered Jul 17 '21 at 14:29

David C. Rankin

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score 0 · Answer 3 · answered Jul 17 '21 at 14:56

0

You could use bash by locally changing IFS to a comma:

join() { local IFS=$1; shift; echo "$*"; }
join , $(groups)

answered Jul 17 '21 at 14:56

Cole Tierney

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score 0 · Answer 4 · answered Jul 17 '21 at 21:51

0

Avoid calling another program with

my_group=$(groups)
echo "${my_group// /,}"

answered Jul 17 '21 at 21:51

Walter A

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How can I print the list of groups in just one line with commas between them?

4 Answers4