Replace new line with ||

Question

I have a file with several thousand lines. I'm looking to replace newline character with ' || ' (that is ||)

I'm wanting to this via bash on Ubuntu 20.04

I've tried the following but in vain -

tr '\n' ' || ' < input.txt
tr '\n' ' \|| ' < input.txt
tr '\n' ' \|\| ' < input.txt

I'm not able to work out what I'm doing wrong. Please can someone help me spot my mistake?

Please add sample input (no descriptions, no images, no links) and your desired output for that sample input to your question (no comment). — Cyrus

usert4jju7 usert4jju7 · Accepted Answer · 2021-12-02T23:27:09

Actually, just after posting this question, I worked this out. Leaving the answer here if someone someday finds it helpful

perl -p -e 's/\n/ || / ' input.txt