why i can't replace string with variable with sed-CodePudding

echo -n  "Username: "
read usernamert
echo -n "Password: "
read passwordt
echo -n "IP: "
read IPt
echo -n  "Channel: "
read channelt

t1=$(echo "www://$usernamet:$passwordt@$IPt/TEST/SOMETHING?channel=$channelt1&TRUE=1")

sed -i "s "t_1", "t_2" "$t1", "AAA" g" test.txt

link should looks like www://username:password@$1.1.1.1/TEST/SOMETHING?channel=2&TRUE=1

so this kind of link i want to change with string in file test.txt

"t_1", "t_2"

but allways gets error. Where I mistake? I also tried to put variables in "" inside t1 variable, but didnt help.

CodePudding user response：

Your double quotes are delimiting the shell strings, not being used literally in the sed pattern and replacement.

Put single quotes around the sed operation, except for the variable.

sed -i 's "t_1", "t_2" "'"$t1"'", "AAA" g' test.txt