Is it possible to coerce bash to reload the .profile file without logging out and back in again?

2 Answers

This should work for the current terminal:

. ~/.profile

. is a bash builtin and a synonym for source, see man bash:

. filename [arguments]
source filename [arguments]
     Read and execute commands from filename in the current shell environment (…).

8

If you don't want to start a new shell but execute the script in the current shell, you source it:

source script_name.sh

source = .

The Bash source built-in is a synonym for the Bourne shell . (dot) command.

courtesy - tldp.org

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