How to date make a file name in linux

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I try to backup a file in crontab but the date to save a specific folder

In crontab

crontab -e

* * * * * echo "hi i am safwan" >> /home/safwan/linx/backup/"$(date +"%Y_%m_%d").bak"

But no backup of the file.

What is the solution?

linux
1 Answers

You use nested double quotes without escaping the inner ones.

This would work:

"$(date +\"%Y_%m_%d\").bak"

However, all these quotes are unnecessary. You can remove them all.

EDIT:

As pointed out in one of the comments to the original question, there is a second problem: % is special character in crontab, so you have to escape it:

$(date +\%Y_\%m_\%d).bak
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