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When is Bash invoked as an interactive login shell?
When bash is invoked as an interactive login shell, or as a non-interactive shell with the –login option, it first reads and executes commands from the file /etc/profile, if that file exists.
When to run ~ /.bashrc at start up?
While non-interactive Bash shells don’t normally run ~/.bashrc commands at start-up, a special case is made when the shell is Invoked by remote shell daemon:
When to use bashrc in a remote shell?
Most of the statements in a typical.bashrc are only useful for an interactive shell – not when running remote commands with rsh or ssh.
What’s the difference between a non-interactive shell and an interactive shell?
non-interactive shell: A (sub)shell that is probably run from an automated process you will see neither input nor output when the calling process don’t handle it. That shell is normally a non-login shell, because the calling user has logged in already.
When Bash is invoked as an interactive login shell, or as a non-interactive shell with the –login option, it first reads and executes commands from the file /etc/profile, if that file exists.
When is / etc / bash.bashrc invoked?
Technically, /etc/bash.bashrc is invoked for interactive, non-login bash shells for all users. However, usually /etc/profile (which is invoked for all login shells) calls /etc/bash.bashrc as well. So that means /etc/bash.bashrc is also invoked for all logins shells as well. However, the first line usually checks quits if non-interactive.
Where does Bash read and execute commands from?
When an interactive login shell exits, or a non-interactive login shell executes the exit builtin command, Bash reads and executes commands from the file ~/.bash_logout, if it exists. When an interactive shell that is not a login shell is started, Bash reads and executes commands from ~/.bashrc, if that file exists.
How does Bash read from the startup file?
As noted above, if a non-interactive shell is invoked with the –login option, Bash attempts to read and execute commands from the login shell startup files. If Bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible, while conforming to the POSIX standard as well.
Why do you need to put # Bin / Bash at the beginning of a script?
Adding #!/bin/bash as the first line of your script, tells the OS to invoke the specified shell to execute the commands that follow in the script. #! is often referred to as a “hash-bang”, “she-bang” or “sha-bang”.
How can I run an interactive bash script?
This drops you into an interactive bash shell after all the environment adjustments are made; you can update this script with the relevant other commands you want to run. What you need is to execute a startup script, then proceed with the interactive session.
Why is Bash not running a login shell?
If the reply is off you are not running a login shell. Read the Bash manual’s invocation section on how Bash reads (or does not read) different configuration files.