Search text and replace line next to it

I have a file which requires modification via a shell script.

Need to do the following: 0. take input from user for new text. 1. search for a keyword in the file. 2. replace the line next to this to this keyword with user supplied input.

for e.g., my file has the following text:

(some text)
(some text)
(text_to_search)
(text_to_replace)
(some text)
(some text)
(some text)

I need to search the file for and rewrite the file replace the line with the input to this script leaving the remaining content untouched.

Regards

This is an utterly terse specification. What have you tried so far?
BTW, I think there are many threads on this question, did you search these forum?

I did search but was not able to find a specific solution.

awk ' zap==1 {print "user input"; zap=0; next} /my pattern/ {zap=1; print $0; next} {print $0} '  infile > newfile

but issue comes when i try taking an input from user.

awk ' zap==1 {print $1; zap=0; next} /my pattern/ {zap=1; print $0; next} {print $0} '  infile > newfile

i get $1 in my file.

Here is one way to do it:

$ cat input
123456
123456
trigger_to_replace_next_line
text_to_replace
678905
678905

$ cat test.sh
# usage trigger replacement

awk '$0 ~ /trigger/ {print; getline; print replacement; next} {print} ' trigger="$1" replacement="$2" input

$ ./test.sh trigger_to_replace_next_line "replacement text"
123456
123456
trigger_to_replace_next_line
replacement text
678905
678905

Thanks Hanson. That solved it beautifully.

Great! Thanks for posting the problem.

Hi Hanson,

What if i have to replace the line 2 or 3 lines after the match?

Regards

Try

awk '/text_to_search/{L=NR+lines} NR==L {getline < "-"; L=0}1' lines=2 file