sed unterminated 's' command modify line of file - bash

Question

I'm trying to modify a groups.tsv file (I'm on repl.it so path to file is fine).
Each line in the file looks like this:
groupname \t amountofpeople \t lastadded
and I'm trying to count the occurences of both groupname($nomgrp) and a login($login), and change lastadded to login.
varcol2=$(grep "$nomgrp" groups | cut "-d " -f2- | awk -F"\t" '{print $2}' )
((varcol21=varcol2+1));
varcol3=$(awk -F"\t" '{print $3}' groups)
sed -i "s|${nomgrp}\t${varcol2}\t$varcol3|${nomgrp}\t${varcol21}\t${login}|" groups
However, I'm getting the error message:
sed : -e expression #1, char 27: unterminated 's' command
The groups file has lines such as " sudo 2 user1" (delimited with a tab): a user inputs "user" which is stored in $login, then "sudo" which is stored in $nomgrp.
What am I doing wrong?
Sorry if this has been answered/super easy to fix, I'm quite the newbie here...

Answer 1

If I understand what you are trying to do correctly and if you have GNU awk, you could do
gawk -i inplace -F '\t' -v group="$nomgrp" -v login="$login" -v OFS='\t' '$1 == group { $2 = $2 + 1; $3 = login; } { print }' groups.tsv
Example:
$ cat groups.tsv
wheel 1000 2019-12-10
staff 1234 2019-12-11
users 9001 2019-12-12
$ gawk -i inplace -F '\t' -v group=wheel -v login=2019-12-12 -v OFS='\t' '$1 == group { $2 = $2 + 1; $3 = login; } 1' groups.tsv
$ cat groups.tsv
wheel 1001 2019-12-12
staff 1234 2019-12-11
users 9001 2019-12-12
This works as follows:
-i inplace is a GNU awk extension that allows you to change a file in place,
-F '\t' sets the input field separator to a tab so that the input is interpreted as TSV and fields with spaces in them are not split apart,
-v variable=name sets an awk variable for use in awk's code,
specifically, -v OFS='\t' sets the output field separator variable to a tab, so that the output is again a TSV
So we set variables group, login to your shell variables and ensure that awk outputs a TSV. The code then works as follows:
$1 == group { # If the first field in a line is equal to the group variable
$2 = $2 + 1; # add 1 to the second field
$3 = login; # and overwrite the third with the login variable
}
{ # in all lines:
print # print
}
{ print } could also be abbreviated as 1, I'm sure people someone will point out, but I find this way easier to explain.
If you do not have GNU awk, you could achieve the same with a temporary file, e.g.
awk -F '\t' -v group="$nomgrp" -v login="$login" -v OFS='\t' '$1 == group { $2 = $2 + 1; $3 = login; } { print }' groups.tsv > groups.tsv.new
mv groups.tsv.new groups.tsv