How can I add datetime to an existing file name in Linux? – unix.stackexchange.com #JHedzWorlD

I want to add date and time to the file name, for example: 08032016out.log.zip

This is what I try to do:

_now=$(date +"%m_%d_%Y") _file="$_nowout.log" touch $_file.txt # creating new file with the timedate 

How can I create the new file with the datetime?

You have created a variable named _now, but later you reference a variable named _nowout. To avoid such issues, use curly braces to delimit variable names:

_now=$(date +"%m_%d_%Y") _file="$_nowout.log" touch "$_file.txt" 

Note that I have left "$_file.txt" as is, because . is already a variable names delimiter. When in doubt, "$_file.txt" could be used just as well.

You need to specify the boundaries of the variable name.

_file will be set to $_nowout.log but the shell can not determine if you mean $_now or $_nowout.

Use

_file="$_nowout.log" 

to explicitly use the $_now variable.

So the script becomes:

_now=$(date +"%m_%d_%Y") _file="$_nowout.log" touch "$_file.txt" 

Which, for the record can be shortened to:

touch "$(date +%m_%d_%Y)out.txt" 

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How can I add datetime to an existing file name in Linux? – unix.stackexchange.com #JHedzWorlD