Firstly, I am new to Linux so excuse me if any terminology is wrong; I'll try to phrase the problem as competently as possible.
I have installed Ruby (2.4.0) via Linuxbrew. The ruby command works fine; it installed correctly. However, when I try to use the gem command (which Ruby should have installed) I receive this error:
bash: /usr/bin/gem: No such file or directory
Now, because I installed this with Linuxbrew I know that this directory isn't correct. For example:
result of which gem : /home/me/.linuxbrew/bin/gem
result of which ruby : /home/me/.linuxbrew/bin/ruby
Therefore, it seems gem is installed but the gem command isn't linked to the correct path. I assume I need to direct the gem command to the path of which gem as opposed to /usr/bin/gem that bash is saying doesn't exist. How would I go about changing this? I tried in vain to change the bash_profile but I'm not sure what to do.
Again, excuse me if ruby and gem are not referred to as commands and if the problem isn't the "default directory" as stated in the title. I wasn't sure how to label it.
EDIT/TL;DR:
Basically, how can I make gem execute this: /home/me/.linuxbrew/bin/gem instead of looking for the program in /usr/bin/gem?
Instead of running gem, run /home/me/.linuxbrew/bin/gem, i.e. type the full path name (followed by any arguments you may need).
If this becomes too tiresome, you could change your PATH. Prepend your bin directory with
PATH=$HOME/.linuxbrew/bin:$PATH
First, the reason you get the error /usr/bin/gem not found, is that earlier in the same shell session, the file used to be there. Bash will cache this to speed things up when running the same command many times. Running hash -r will clear this.
Editing PATH you seem to have managed, hence the which command gives the result it does.
To answer my own question-
As I had previously installed and uninstalled Ruby via apt-get instead of Linuxbrew in the same Terminal window, Bash was looking for gem in usr/bin as opposed to the path specified in my bash_profile to Linuxbrew.
Therefore, Stian's answer above with hash -r would also work, I am sure.
Related
I confess, I very don't know what I'm talking about.
This morning I wanted to install Javascripting (to learn javascript) on my Mac, so I watch a video to do it:
I downloaded node.js and I installed it;
after that I opened the terminal and I type: npm install -g javascripting and here I've got some errors. I tried to search the solution but I think I created a big problem:
Basically I modified the $PATH several times and now the situation is this.
If I run echo PATH it displays
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
I wanted to clean it all so I tried to type:
brew uninstall --force node
but the terminal says:
zsh: command not found: brew
I can't do anything.
Please, someone help me :(
If you just want to clear this environment variable, just do 'unset PATH'.
But, be aware that PATH is used by a shell (i.e. bash, ksh, zsh...) to look for programs in these directories. clearing it has side effects.
The 'brew' program is somewhere, to find it, you could use the following command :
find / -name 'brew' -print
It can take a little while to find it.
Either use that found path, or add the directory where that program is found to the PATH variable, as in
PATH=$PATH:/location_of_brew_program; export PATH
I have started learning groovy and I just came across the SDKMAN utility.
To give it a try I folllowed the installation guidelines at the official site of sdkman and tried to run the below command to install sdkman on Windows 10 :
set SDKMAN_DIR="E:/sdkman" && curl -s "https://get.sdkman.io" | bash
But I donot see any sdkman folder present in my E drive.
When I try to re-run the command it says :
Looking for a previous installation of SDKMAN...
SDKMAN found.
======================================================================================================
You already have SDKMAN installed.
SDKMAN was found at:
"E:/sdkman"
I am just confused as to why am I not able to see it with my eyes. I have even tried enabling view hidden items.
Tried to execute which sdk. but it clearly says which: no sdk in (..
...
has anyone else experienced similar issue. Any help is highly appreciated.
which bash implementation are you using under windows? cygwin? gitbash?
I believe at least in gitbash that the path syntax is /e/sdkman/, i.e. you would do:
export SDKMAN_DIR="/e/sdkman" && curl -s "https://get.sdkman.io" | bash
but it's been a long time since I was on windows and I suspect this is bash-implementation specific (i.e. it might differ between cygwin and gitbash for example).
If this assumption is correct, the syntax you were using might have created a directory called E:/sdkman under your user's home directory or whatever directory you happened to be in when you ran this. Just guessing here, but worth a look.
I just installed sdkman for installing grails on my machine (MacOS). When I run which sdk command I don't get any output. But when I run the sdk help command the shell is able to resolve it and give the right output. I checked all the directories mentioned in $PATH environment variable but I could not find any executable sdk. So my question is how is shell able to resolve the sdk command?
Note: I also checked in Ubuntu and I see the same behavior.
As you mentioned correctly "sdk" is not a command, its a declared function created by sdkman-main.sh (in ~/.sdkman/src) once called from ~/.sdkman/bin/sdkman-init.sh
This is the reason why the installation page of sdkman asks for appending the following steps in the .bash_profile which declares this function each time the bash profile is loaded :
#THIS MUST BE AT THE END OF THE FILE FOR SDKMAN TO WORK!!!
[[ -s "/home/dudette/.sdkman/bin/sdkman-init.sh" ]] && source "/home/dudette/.sdkman/bin/sdkman-init.sh"
This is also the reason "which" command doesn't pick it up as it checks for the installed commands on the linux PATH
OK. So I found it out. As #that-other-guy mentioned in the comment above, I used type -a instead of which, which showed me that it was a function defined.
I am new to using make files. I have cygwin and MinGW. I'm still looking into their differences.
Anyway, I have a makefile that is used to create a project for an FPGA, which I have never done before. I have included C:\cygwin\bin and C:\MinGW\msys\1.0\bin in my PATH, but I always get this error.
make: pwd: Command not found
I typed pwd into the cmd prompt and get a correct response. Any pointers? Am I missing something? Not sure what else I can try. Most forums I have found pertaining to this error never have a resolution.
Let me know what information you'd like.
pwd is commonly both a shell built-in command and a standalone executable, provided by GNU coreutils (which Cygwin installs by default).
If you're invoking make from the Cygwin environment (say, typing make at a bash shell prompt), then C:\cygwin\bin is the wrong way to specify the directory. That's the path as seen from Windows. From within Cygwin, it's /bin -- and it should be in your default $PATH. The Cygwin equivalent of C:\MinGW\msys\1.0\bin would be /cygdrive/c/mingw/msys/1.0/bin
If you're doing this directly from Windows rather than in the Cygwin subsystem, then C:\cygwin\bin is the path to the Cygwin bin directory -- but running C:\cygwin\bin\pwd is going to give you a Cygwin-specific directory name that's not going to be meaningful to Windows.
I have encountered the same issue in my mingw environment. It turned out in my case to be a missing 'pwd'executable in the msys/bin directory. Once the copying was done properly, everything fell into place. Hope this helps
I am trying to give a non-root user the ability to run mercurial commands from the shell. When I log in as the user and type "hg", I get this message:
abort: couldn't find mercurial libraries in [/usr/local/bin /usr/lib/python24.zip /usr/lib/python2.4 /usr/lib/python2.4/plat-linux2 /usr/lib/python2.4/lib-tk /usr/lib/python2.4/lib-dynload /usr/lib/python2.4/site-packages /usr/lib/python2.4/site-packages/Numeric /usr/lib/python2.4/site-packages/gtk-2.0]
(check your install and PYTHONPATH)
I do not have this problem as the root. I can run mercurial commands from any directory.
My problem is that I'm not very familiar with Linux at all, and so I don't know exactly how I'm supposed to change my PYTHONPATH variable (if indeed that's what I'm trying to do). I don't even know where the PYTHONPATH variable is being stored to see what's written there now.
Can someone tell me where the PYTHONPATH (or even regular PATH) environment variable is stored in Linux, and what steps I might take to remove the error method I'm getting above? If it helps, I'm using Putty and SSH to access the server.
Thanks! :)
The PYTHONPATH is just an environment variable that gets prepended to the python's internal search path. To see what is in there, do the following in python shell:
>>> import sys
>>> sys.path
It should print something like:
['', '/usr/lib64/python27.zip', '/usr/lib64/python2.7', '/usr/lib64/python2.7/plat-linux2', '/usr/lib64/python2.7/lib-tk', '/usr/lib64/python2.7/lib-old', '/usr/lib64/python2.7/lib-dynload', '/usr/lib64/python2.7/site-packages', '/usr/lib64/python2.7/site-packages/PIL', '/usr/lib64/python2.7/site-packages/gst-0.10', '/usr/lib64/python2.7/site-packages/gtk-2.0', '/usr/lib64/python2.7/site-packages/webkit-1.0', '/usr/lib64/python2.7/site-packages/wx-2.8-gtk2-unicode', '/usr/lib/python2.7/site-packages', '/usr/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg-info']
In practice, I would guess your shell is bash so the places where the environment variables can be set are:
/etc/profile, /etc/bashrc, ~/.profile and ~/.bashrc - the first 2 being system wide and the latter per user.
For further explanation, see this blog article abour bashrc and profile
EDIT
To fix this, the probably the easiest way is to install Mercurial via pip (I am assuming that you do not have Mercurial in the official repository for your Linux distribution, but usually python-setuptools or similar, that provides easy_install is). See this question for instructions.