Replace string in a file with url present in another file in shell script

Question

I was like trying to replace a string in a file with the url present in another file using sed command. for example... let url.txt be the file that contains url:

https://stackoverflow.com/questions/1483721/shell-script-printing-contents-of-variable-containing-output-of-a-command-remove

and demo.txt contains Replace_Url the sed command I used is:

sed -i "s/Replace_Url/$(sed 's:/:\\/:g' url.txt)/" demo.txt

there comes no error but the string hasn't been replaced..

sed -i "s@Replace_Url@$(<url.txt)@" demo.txt

F. Hauri - Give Up GitHub
– F. Hauri - Give Up GitHub

2022-03-16 16:43:03 +00:00
Commented Mar 16, 2022 at 16:43 — F. Hauri - Give Up GitHub
– F. Hauri - Give Up GitHub, Commented Mar 16, 2022 at 16:43

Ed Morton · Accepted Answer · 2022-03-19 12:07:33Z

0

It'd be hard to do this job robustly with sed since sed doesn't support literal string operations (see Is it possible to escape regex metacharacters reliably with sed), so just use awk instead, e.g.:

awk -v old='Replace_Url' '
    NR==FNR { new=$0; next }
    s=index($0,old) { $0 = substr($0,1,s-1) new substr($0,s+length(old)) }
    { print }
' url.txt demo.txt

answered Mar 19, 2022 at 12:07

Ed Morton

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Comments

Sneha · Accepted Answer · 2022-03-17 04:32:04Z

0

sed -i "s@Replace_Url@$(<url.txt)@" demo.txt it works

edited Mar 17, 2022 at 4:32

answered Mar 17, 2022 at 3:56

Sneha

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2 Comments

Ed Morton Over a year ago

That would fail given various contents of url.txt, e.g. & or \1 or @.

the Tin Man Over a year ago

Please read "How to Answer" and "Explaining entirely code-based answers". It helps more if you supply an explanation why this is the preferred solution and explain how it works. We want to educate, not just provide code.

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