I have homebrew's bash package installed. When I open a new shell:
bash --version gives GNU bash, version 5.0.7(1)-release (x86_64-apple-darwin18.5.0)
which bash gives /usr/local/bin/bash as expected.
But:
echo $BASH_VERSION yields 3.2.57(1)-release
I'm wondering if this is something I should address for scripts that might use this environment variable.
It means that the shell you're in is Bash 3.2, but bash points to Bash 5.0. Try bash and then, in the new shell, echo $BASH_VERSION – I guess it'll be 5.0. To change your login shell, add /usr/local/bin/bash to /etc/shells and change the default shell with
chsh -s /usr/local/bin/bash
sudo chsh -s /usr/local/bin/bash
After logging out and in again, $BASH_VERSION should be updated.
As for shebang lines, I recommend
#!/usr/bin/env bash
as it's portable and will use the first Bash in your $PATH.
The source of my problem was a terminal app preference setting. The "Command (complete path)" was set to /bin/bash. After setting it to "Default login shell", echo $BASH_VERSION reported the version I expected. The other problem is I stupidly ran the bash --version command in iTerm2, not terminal. So it gave a different response than what terminal would have.
Your login shell (see echo $SHELL) is probably /bin/bash and that is the one setting $BASH_VERSION. If you need to use a specific version in scripts, use the full path in the #! line.
Make sure to check that the terminal you are using is using the default login shell and not a custom one.
Related
I have tried to run:
uninstall_oh_my_zsh
but i get a message stating that: -bash: uninstall_oh_my_zsh: command not found
Other commands i have tried are:
chmod +x ~/.oh-my-zsh/tools/uninstall.sh
I get a response stating that: No such file or directory
sh ~/.oh-my-zsh/tools/uninstall.sh
Ran:
chsh -s /bin/bash
To change default terminal from /bin/zsh to /bin/bash
I also tried:
rm -rf ~/.oh-my-zsh
rm ~/.zshrc
cp ~/.zshrc.pre-oh-my-zsh ~/.zshrc
source ~/.zshrc
None of them have worked thus far, when i open my terminal. I get a message stating that:
The default interactive shell is now zsh.
To update your account to use zsh, please run chsh -s /bin/zsh
You don't have Oh My Zsh (a set of configuration files for zsh and a way to manage them) installed in the first place.
The warning is coming from /bin/bash itself; it's hard-coded into the executable supplied by macOS.
$ strings /bin/bash | grep "default interactive shell"
The default interactive shell is now zsh.
Though they don't say so, I suspect the warning is there because they plan to remove bash from future versions of macOS entirely. They stopped providing newer versions of bash years ago.
Your default shell is already /bin/bash; the warning is recommending that you switch to /bin/zsh.
You can continue to use bash, though I recommend installing a newer version (3.2 is old) using something like Homebrew, then changing your login shell to the new version.
However, unless you are really committed to using bash, I suggest given zsh a try.
I'm new to macOS coming from Windows and Linux. I want to use bash and found how to upgrade bash on Catalina, version now:
GNU bash, version 5.0.18(1)-release (x86_64-apple-darwin19.5.0), also installed coreutils.
I'm trying to set direxpand in .bashrc (which works as expected in *nix variants):
shopt -s direxpand
But when .bashrc is sourced I get an error:
-bash: shopt: direxpand: invalid shell option name
Spent a couple of hours searching online and can't find an answer, can anyone help?
Update 28/07/20 14:08 GMT
Interesting, following other advice before posting, I installed bash with brew and had to set my shell to /usr/local/bin/bash for the terminal app to use it.
So output from bash --version:
GNU bash, version 5.0.18(1)-release (x86_64-apple-darwin19.5.0)
But echo $BASH_VERSION gives:
3.2.57(1)-release
So something not right there?
Also, output from running shopt does not show direxpand.
Solved 28/07/20 20:00 GMT
For anyone with a similar problem, here's what I found.
bash installed with Catalina did not include the same shell options I have in linux.
The full solution is to install coreutils and bash with brew:
brew install coreutils bash
Then add the new version of bash to shells:
sudo vi /etc/shells add /usr/local/bin/bash
Then change your user shell:
chsh -s /usr/local/bin/bash
Then in terminal preference > general > shells open with > command (complete path) add the new bash /usr/local/bin/bash
After that shopt -s confirms that direxpand is now an option and my .bashrc works as expected.
When running shopt without arguments you can see the available shopt options you can set. In your case I expect direxpand it's not there.
The workings of the direxpand shopt option depends on the readline library. If bash is compiled without readline support this option will not be there. I expect that is the case for you.
An option would be to compile bash yourself. The accepted answer of this question will show you how to compile bash yourself. You can add the --enable-readline option in configure to force turn on readline support.
Note: compiling yourself might require you to get the readline library in your OS. I expect bash was compiled without it because it is not easily available, but that is for you to figure out.
The ${parameter[^|^^|,|,,][pattern]} parameter substitution is giving me a bad substitution error.
$ echo $greeting
hello world
$ echo "${greeting^}."
-bash: ${greeting^}.: bad substitution
I updated to the latest bash version and keep getting the error.
GNU bash, version 4.4.19(1)-release (x86_64-apple-darwin17.3.0)
I've looked everywhere and the only suggestion I've found is making sure it's running bash 4.
$ echo $SHELL
/bin/bash
I'm running macOS High Sierra.
Your default shell is not the bash shell (downloaded from brew install bash) that contains the v4 which supports the parameter expansion syntax you are referring to.
On macOS echo $BASH_VERSION will tell you the version of the current shell. bash --version tells you the version of the first bash in your $PATH. So the way you were looking at the version was not telling you the version that you were running.
You need to add the recent version of bash to the file /etc/shells as the last line and use the command to set the shell as the default on Terminal
chsh -s /usr/local/bin/bash "$USER"
After this close and re-open the Terminal to make it effect. Without adding this default option in your Terminal, you could only use the recent bash only on scripts with interpreter she-bang set to #!/usr/local/bin/bash
See also this Ask Different answer to - Update bash to version 4.0 on OSX
When running bash scripts inside zsh-Terminal I want it to use the homebrew bash version 4 instead of the default 3 of OS X.
How can I do that?
I installed bash 4 on my MacBook.
brew install bash
Instead of using it as the default shell using the following command, I want to keep my zsh.
chsh -s $(brew --prefix)/bin/bash # BAD! as I lose zsh
Still I want to run:
./my-cool-bash.sh
Use the following shebang in your scripts:
#!/bin/env bash
This makes them use the first bash in the PATH; which is the one you want.
This solution works with any Bash on any UNIX-like system.
use your new bash path:
ex, if new bash is in /usr/local/bin/
/usr/local/bin/bash my-cool-bash.sh
or write first line of script:
#!/usr/local/bin/bash
you could put an alias in your .zshrc file, something to the effect of
alias mcb='./usr/local/bin/bash/my-cool-bash.sh so that you can call it from your normal zsh whenever you want.
I have /bin/bash (3.2) and /usr/local/bin/bash (4.0) on my computer. In the $PATH environment variable, bash 4.0 is prior to bash 3.2.
in my bash script shebang, I don't like to explicitly use:
#!/usr/local/bin/bash
I'd like to find bash based on $PATH priority. How to do it? Thanks!
you can always try
#!/usr/bin/env bash