Why my sed command works separetly but doesn't in shell script?

Question

this is my first post in Stackoverflow. I have an issue with executing sed command in the script while same command works fine separetly.

script:

#!/bin/bash

filename=file
sensitive="censored"

while IFS=  read -r line; do
        if [[ $line == *"Memory Region Size"* ]];
        then
                server_name=$(echo "$line" | awk '{print $11}')
                echo "$line"  >> test
        elif [[ $(echo "$line" | wc -w) == 4 ]];
        then
                echo "$line" | awk '$4="censored"' >> test
        else
                echo "$line" >> test
        fi
done < $filename

sed -i "s/${server_name}/${sensitive}/g" test
echo $server_name
echo $sensitive

I want to censor file with replacing server_name with "censored". This is output I am taking:

$ ./log_censor.sh 
sed: -e expression #1, char 36: unterminated `s' command
ABC-123 
censored

The same command it one-line command works fine for me:

$ cat file1
My server is ABC-123

$ server_name="ABC-123";sensitive="censored";sed -i "s/${server_name}/${sensitive}/g" file1

$ cat file1
My server is censored

I appreciate any help. Thanks

Answer 1

Mixing bash and awk and sed seems unnecessary. Do it all with one language, awk for example.

# usage: awk -f this_script.awk file file > test

BEGIN {sensitive = "censored"}

NR == FNR && /Memory Region Size/ {server_name = $11}
NR == FNR {next}

NF == 4 {$4 = sensitive}
{
    gsub(server_name, sensitive)
    print
}