How to add days to date and get new date on Linux

I brought eggs from the market, and it says best before 20 days from the date of packing. Say my egg box was packed on 29/July/2020. How do I add days to date using Linux CLI? I want to find out date 29/July/2020 + 20days using the CLI, and how do I do it?
[continue reading…]

awk: warning: escape sequence '\<' treated as plain '>'

I‘m trying to match words using GNU awk command and getting the following error:
echo 'foo bar this that blah' | awk '{gsub("\<regex-word\>", "NEW-WORD");print}'
But getting the following warning on screen and it is not working:
awk: warning: escape sequence `\' treated as plain `>'
How do I fix this problem under Unix like operating systems?
[continue reading…]

Truncate: UNIX Binary Log File

How do I truncate a UNIX binary log file using command line options?
[continue reading…]

Linux / UNIX : Move File Starting With A Dash

In Unix or Linux operating systems, how do I move file(s) starting with a dash (e.g., /home/you/--filename.txt or /home/you/-filename.txt)? How do I copy a file whose name begins with dash/hyphen (“-“)?
[continue reading…]