How to show vi mode in prompt with tcsh - shell

I use vi keybindings when working within my terminal shell to keep continuity between my shell and vim editor. Because of IT requirements, I need to now switch to tcsh from bash and zsh and I am looking at recreating some of my configurations within tcsh. The biggest friction point that I have hit now is that I can't view which vi mode I am currently in within my prompt which can lead to unexpected behavior when I am working. Through zsh and bash there is a lot of information on how to achieve this. I haven't been able to find anything about tcsh except for this link. I wasn't able to work through the only answer that actually provided an answer. What can I do to retrieve my vi mode (insert/normal) I am in when using the tcsh shell?

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Need to update shell in PyCharm to zsh

Started taking the 'Programming for everyone' course on Coursera to learn python. Ive downloaded 2 text editors. Atom and Pycharm. When I open the terminal both say, "The default interactive shell is now zsh. To update your account to use zsh, please run chsh -s /bin/zsh."
Please understand I'm totally new. This is the first time I've ever used a text editor or terminal so don't know where to run this or how to straighten this out. Im using a 2015 MacBook Pro running 10.15.7Image is screenshot of editor and terminal in pycahrm im in.
Yeah, it sucks. I had the same problem with Pycharm, but this solution worked for me.
1- Change zsh to bash
$ /bin/bash
2 - Get the commands back like (cd, ls, clear ...)
PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin
3 - Get the profile back
. /etc/profile
After that your porfile will look like this "username:" instead of this "%n#%m %1~ %#"
One more thing, if you using mac, open your terminal and check preference. In the preferences go to General -> Shells open with -> if it is Default Login shell which means you are using zsh, you should change to Command (complete path): and add /bin/bash in the space below so that your default change to bash.
I hope it was useful for you, and for the people looking for answers. Cause, I wasted an hour looking for solution that JetBrain Pycharm and Apple couldn't provide.

In ConEmu I can't change the PROMPT when using cygwin bash

In conemu using cmd I can edit the prompt nice and easy in the CmdInit.cmd file - I do this because I don't like the prompt spread over two lines.
However I can't seem to do the same trick when I select the startup in settings to be bash::Cygwin.
I see that the CmdInit.cmd is dos commands, so I could create a startup.sh? not sure how I invoke it.
Also the PROMT variable does not seem to exist in the bash mode - even though there is a very long two-line prompt. How can I change it? Where are the defaults even taken from?

Vim Vundle broken, can't open file

My vim setup apparently has broken out of nothing. It now spills errors for every single plugin I have configured. This started happening after I have changed some appearance settings, some syntastic features (both of which I don't think are the cause) and changed my shell to fish (this MAYBE is the cause).
Using the directive set shell=/usr/bin/fish or set shell=fish does not change anything, it still fails, for which I tried after reading this question.
The errors happen for both :BundleInstall and :BundleUpdate. My full vimrc file is available here if there is need to read it, it's not long.
Yes, setting your shell to fish is likely to be the root of your problem. The fish shell doesn't support the standard UNIX syntax for file redirections, which breaks Vim's system(). Just set Vim's shell to sh:
set shell=/bin/sh
You can't use the interactive features of fish from Vim anyway.
A while back I wrote up some docs for this on the Vundle wiki that you may find useful. In short, you can either:
Run: env SHELL=(which sh) vim +BundleInstall! +BundleClean +qall
Add set shell=sh to your .vimrc
As an aside, my Tackle project has an Up plugin that includes a handy way to update your vim plugins via Vundle.

Any execution of command in vim causes it gets suspended

This occurs when I set the vim's shell to be interactive:
set shellcmdflag=-ic
or
set shell=/bin/bash\ -i
I like these because they give syntax highlighting to the output (eg.: !ls)
But the cost is that I have to type fg # every time.
Is this a default behavior?
How can I get interactive shell in vim without having to make it run foreground?
You can't. This behavior is perfectly normal and expected and in line with Vim's author's philosophy. It's very unlikely to change in the future.
If you want a shell inside Vim, you'll have to install a plugin like Conque or Vimshell.
I usually just use tmux instead. You can split the terminal and have a normal interactive shell and an instance of vim running side by side - very handy.

Difference between Bash shell and Bash terminal?

Ok, I hope this question makes some sense but what is the difference between a bash shell and a bash terminal? Example. When I first open up terminal I have a prompt with my current dir and my user name. In the terminal window header it says -bash- , when I type echo $SHELL I get bash. So by default the shell is bash. Where my confusion comes into play is when I type bash. My prompt then goes to bash-3.2$.Obviously it's a different mode. Are ther any major differences? I have read the man page with no answer. I understand what a bash shell is but just do not get the difference. Thanks for the clarity in advance.
There is no difference, they are both instances of the bash shell.
The reason you are seeing a different prompt is that your initial login shell sources ~/.bash_profile where presumably you have your prompt set. When you type bash it invokes another shell but because this one isn't a login shell, it doesn't source ~/.bash_profile and so you get the default prompt.
If you were call bash -l, (which invokes bash as if it were a login shell) I bet you would see that your original prompt remains

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