.bash_profile无法操作，更新路径无法解决问题

Question

I'm not sure where I went wrong, but I used nano to edit my bash_profile to install JavaSDK on my Mac a few days ago. I have been doing everything in Eclipse, so I haven't had occasion to visit the command line for a few days...until today.

Nothing works. No ls , no nano , no vim ...nothing. I tried to type:

-bash: nano: command not found

-bash: ls: command not found

defaults write com.apple.finder.AppleShowAllFiles YES to unhide system files so I can figure out where my .bash_profile is and I get this:

-bash: defaults: command not found

I'm able to find command line solutions that look promising, but I can't get any commands to be recognized. Any helpful hints would be greatly appreciated.

UPDATE:

I've attempted to implement solutions I've found on StackOverflow and elsewhere, yet I'm still finding commands that were previously working are no longer doing so. When I make changes, I log out and back in. Rebooting doesn't seem to do the trick, either.

echo $PATH returns the following:

/Library/Frameworks/Python.framework/Versions/2.7/bin:/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/bin:/usr/local/sbin:/usr/sbin:/usr/bin:/root/bin:/usr/local/bin

Here's my .bash_profile :

#Setting PATH for Python 2.7
export RBENV_ROOT=/usr/local/var/rbenv

#Java setup
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home
export PATH=/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/bin

if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi
# RUBY FIX?

# PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}"
PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}:/usr/local/sbin:/usr/sbin:/usr/bin:/root/bin:/usr/local/bin"
export PATH

Are there any other places I should be looking? What turned out to be a minor issue a few days ago is turning into a major one, as I can't get any work done.

Answer 1

Use /usr/bin/nano (not just nano because your PATH variable is messed up) to edit your .bash_profile again.

Remove the line:

export PATH=/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/bin

As well as the line:

PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}:/usr/local/sbin:/usr/sbin:/usr/bin:/root/bin:/usr/local/bin"

First, save this, log out, log in, and make sure that you have all your commands back as you know them.

Then check if you have python and java available. You should not need to change the PATH at all when you have installed Java, and I believe not when you have installed python either. The installation of the Oracle JDK automatically adds java to your existing path. At most, you should set the JAVA_HOME .