How to feed the actual value on the command where a text file is expected

Question

In my Linux environment, I am using a installed command that is of this format.

command1 -u <username> -p <password-file> ... 

where in this password-file, it keeps a password value of the text format, such as "abc".

When running this command, I feel it is very inconvenient to every time create a file to hold this password value! So is there a way I can feed this "abc" value directly on this command line ???

Thanks, Chun

Answer 1

If you are using bash (and if you are running in Linux, chances are good you are, or can) you can do:

command -u username -p <(echo abc)

which is equivalent to passing the name of a file with contents "abc\\n".