how to add new line before 10 line to match word on text file using shell script

Question

I tried using this command, but it didn't work for me. If i execute the below command,

 #!/bin/bash

# set the path to your file
file_path="/etc/nginx/nginx.conf"


# set the word you want to search for
search_word="Settings for a TLS enabled server"


# get the line number where the word is found
line_number=$(grep -n "$search_word" $file_path | cut -d: -f1)


# calculate the line number where you want to insert the new line
insert_line=$((line_number-10))


USAGE=$(cat <<-END
    location /nginx-status {
             stub_status on;
             allow all;
    }
END

)


# insert the new line using sed
sed -i "${insert_line}i $USAGE" $file_path

I need to add below line, Before 10 line to "Settings for a TLS enabled server" in Nginx.conf file.

location /nginx-status {
stub_status on; 
allow all; 
}

Looking forward as in the image below. Expecting_result

this is answered here: https://stackoverflow.com/questions/15559359/insert-line-after-match-using-sed — akathimi, Feb 15 '23 at 13:18
Please use text rather than images for the expected output. The images are usually a pain to read. — kometen, Feb 15 '23 at 13:21
I want "Insert 10 line before match" in the conditional, But the link only says "after match". — anandarc, Feb 15 '23 at 13:30

hacker315 · Answer 1 · 2023-02-15T13:55:55.667

0

Try this:

sed -i '10ilocation /nginx-status {\nstub_status on; \nallow all; \n}' $path/nginx.conf

EDIT: This works:

sed -i "$(echo $insert_line)i $(echo $USAGE)" $file_path

edited Feb 15 '23 at 13:55

answered Feb 15 '23 at 13:20

hacker315

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But it doesn't have any command to search specific line. – anandarc Feb 15 '23 at 13:31
Thanks for your valueable time @hacker315, It is works. – anandarc Feb 15 '23 at 14:30
Thanks, kindly mark this as an answer if you think it helped. – hacker315 Feb 16 '23 at 09:00

score 0 · Answer 2 · answered Feb 15 '23 at 14:15

The easiest is a simple awk in combination with tac

awk '(NR==FNR) { to_print=to_print ORS $0; next }
     /Settings for a TLS enabled server/{n=10}
     {print; n--}(n==0){print to_print}
    ' <(tac insert_file.txt) <(tac update_file) | tac > update_file.new
mv update_file.new update_file

how to add new line before 10 line to match word on text file using shell script

2 Answers2