linux - Bash - Concatenating Variable on to Path -

currently, have bash script untar file in root directory:

#!/bin/bash tar xvf ~/some-file.tar 

this works without problems. now, change can specify path file in pre-defined variable such:

#!/bin/bash p="~" tar xvf $p/some-file.tar 

this gives me following error message:

tar: ~/some-file.tar: cannot open: no such file or directory tar: error not recoverable: exiting 

the path file seems correct, however, there hidden characters causing fail? proper way concatenate variable , path without storing both in string variables (if there one)?

tilde expansion doesn't work when inside variable. can use $home variable instead:

#!/bin/bash p=$home tar xvf "$p/some_file.tar"