Shell Programming and Scripting

Sometimes when I boot, my system goes into emergency mode.

I then use Clonezilla to restore an image.

Usually the image is older than the current date.

This is part of a backup script that runs as a startup program.

Code:

cd /home/andy/bin/
zip -u -q Ubuntu_Scripts.zip *.sh *.rb *.c *.py *.txt
cp -u Ubuntu_Scripts.zip /media/andy/MAXTOR_SDB1/Ubuntu_Mate_18.04/
cp -u Ubuntu_Scripts.zip /media/andy/MAXTOR_SDB5/Emergency_Backup/

This then overwrites my zip file with one that is in fact older.

I thought that if I could compare the file dates, before the zip operation, I could prevent the overwriting.

Normally, when we make backups, we put the date of the backup in the name of the file.

So, if you do this using a standard UNIX time, it is very easy to parse than info out of the filename and compare.

Example:

Code:

mybackupfile.1533817852.tar.gz

Thanks.

How do I put date into the filename?

Use the utility in your script (depends on the shell or script you are using) and attach it to the filename.

When you are asking technical questions, you will get faster and better answers, and not waste others' time, by providing the details of what you are doing.

operating system? scripting language (bash, PHP, ksh, etc)? and other details.

If we have to reply back and forth many times, just to get basic info, it is a waste of both of our time.

OK. Using bash, Ubuntu Mate 18.04. Ubuntu Mate terminal.

I do not understand "utility in my script."

How to you get the UNIX time in bash?

HINT:

Code:

date +%s