Need Comma seperated output for N number of values in Shell [duplicate]

Question

This question already has answers here:

Turning multi-line string into single comma-separated (18 answers)

Closed 6 years ago.

Given below is a script with X number of Outputs:

#!/bin/bash

instant_client="/root/ora_client/instantclient_11_2"
output=`$instant_client/sqlplus -s HRUSER/HRUSER@TOMLWF <<EOF
set heading off
set feedback off
set lines 10000
set pagesize 10000
select count (1) from onboardingcandidates o, candidatedetails c where o.candidateid=c.candidateid and     o.JOININGSTATUS='0091' and to_date(o.joiningdate)=to_date(sysdate+5);

EOF

exit`

echo $output

Output:
cand1
cand2
cand3
cand62

Required Output:

cand1, cand2, cand3, cand62

Answer 1

If you don't require spaces:

... | paste -d, -s -

If you need spaces:

... | paste -d, -s - | sed 's/,/, /g'

Answer 2

Use awk and and change the ORS:

echo $output | awk -v ORS=", "  '{print $0}'