A user starts a new terminal window in a running graphical desktop session, which launches bash as an interactive shell that is NOT a login shell. Which file in the user's home directory does bash read in that case?
LPIC-1 Exam 101-500, objective 103. GNU and Unix commands medium
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The options
Correct ~/.bashrc
Correct. An interactive non-login bash reads ~/.bashrc. That is why aliases and prompt settings belong there rather than in the login files.
Not correct ~/.bash_profile
Wrong. ~/.bash_profile is read by interactive LOGIN shells (console login, ssh, su -). Many distributions have it source ~/.bashrc so the settings appear in both, but bash itself does not read it for a non-login shell.
Not correct ~/.bash_logout
Wrong. ~/.bash_logout is executed when a login shell exits, not when a shell starts.
Not correct ~/.profile
Wrong. ~/.profile is a login-shell file, read by bash only when ~/.bash_profile and ~/.bash_login are absent.
Why
Bash uses two different startup paths. Interactive login shells read /etc/profile and then the first of ~/.bash_profile, ~/.bash_login, ~/.profile. Interactive non-login shells read ~/.bashrc (and usually /etc/bash.bashrc or /etc/bashrc, depending on the distribution). A terminal opened inside an existing desktop session is the classic non-login case, so ~/.bashrc is the file that runs.
Where this comes from
- Cited
- LPI exam objective 103.1
- What it says
- Shell startup: which bash configuration files apply to login and non-login shells.
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 103 and space the ones you get wrong.
More questions on this objective
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