Many commands like roscd, rosls, roslaunch are not working. Errors are thrown as :-
roscd: command not found
What may be the reasons behind this?
It seems that your setup.bash hasn't been sourced in a terminal window.
Try executing this command:
source /opt/ros/hydro/setup.bash
If that won't work try following the steps on site bellow, as they are beautifully explained on how to install ROS on Ubuntu.
http://wiki.ros.org/groovy/Installation/Ubuntu#groovy.2BAC8-Installation.2BAC8-DebEnvironment.Environment_setup
you need to setup you environment and add variables to your bash
just use the following commands..
echo "source 'your setup.bash file path'" >> ~/.bashrc
source ~/.bashrc
Related
I'm following the CLI setup for twilio and i get the following instruction from the command line on my mac (mojave) when i reach the autocomplete section of this document (https://www.twilio.com/docs/twilio-cli/quickstart). I do not know what i am being instructed to do here. Excuse my naivety.
1) Add the autocomplete env var to your bash profile and source it
$ printf "$(twilio autocomplete:script bash)" >> ~/.bashrc; source ~/.bashrc
NOTE: If your terminal starts as a login shell you may need to print the init script into ~/.bash_profile or ~/.profile.
2) Test it out, e.g.:
$ twilio <TAB><TAB> # Command completion
$ twilio command --<TAB><TAB> # Flag completion
Enjoy!
You can run the command:
printf "$(twilio autocomplete:script bash)" >> ~/.bashrc; source ~/.bashrc
from your OS-X terminal prompt, it will then append >> the output of that command to your ~/.bashrcfile. It then sources the contents of that file to populate your terminal environment (do you don't need to close your terminal and re-open it in this first instance).
From that point on, when you start a new Bash shell, you will be good to go (and don't need to run that command again).
I have no idea what I am doing here, I am trying to install fastlane via terminal, but I keep getting this error:
Couldn't detect shell config file (zsh - ~/.zshrc) Please add the
following line to your zsh profile: export
PATH="$HOME/.fastlane/bin:$PATH"
My question is how do I locate and add this line to my zsh profile?
I have absolutely no idea what I am doing here.
You should add this line in your bash profile :
export PATH="$HOME/.fastlane/bin:$PATH"
There are (mainly) two user level files which bash may run when a bash shell starts.
~/.bash_profile or ~/.bashrc.
And its depend your OS.
I'm a complete newbie, so I think I'm just missing a step, but have no idea.
I'm following tutorials for Rails. Lots of steps say, "and then editing the ~/.zshrc file." but I don't have any ~/.zshrc file. I'm looking at the folders in Sublime. Also none of the following ~/.zprofile, ~/.zlogin, ~/.zlogout exist. Though, under my home files, there is .zprezto folder. No zshenv either...
Do I just create the files? Seems like they should be downloaded from somewhere. I'm using Terminal with OS X. So lost.
echo 'write whatever' >.zshrc
Thanks in advance!
You will get ~/.zshrc file only when you use zsh shell on your Mac OS. If you're not sure which shell you're using, open terminal and issue the following command.
echo $SHELL
if you get response like /bin/zsh then you're using zsh shell on your Mac. You can edit ~/.zshrc file using vim editor on your Mac which is the default for Mac OS.
to open ~/.zshrc file using vim editor, issue the following command on your terminal.
vim ~/.zshrc
Then you can do any configurations you need. Or else you can use open -t .zshrc command to open ~/.zshrc file from your general TextEdit on Mac OS.
$ open ~/.zshrc
Make changes in the .zshrc file window that opens
Save file
$ source ~/.zshrc
The .zshrc file is used to configure your terminal prompt if you're using zsh (z-shell) login shell (n.b., a "login shell" is the command line presented to you when running the terminal application). If you're using a standard OSX terminal, then you're probably using bash (the BASH Shell), so editing .zshrc wouldn't affect anything. Bash uses .bashrc and .bash_profile` for it's configuration. These file are run overtime you open terminal window and setup things the command aliases, setup your prompt and maybe run scripts to initial other programs.
You almost certainly don't need to edit terminal config files to develop with Ruby on Rails, especially as editing these files incorrectly can mess up your system, or at least make it hard to return the system to a stable state.
I usually use the vi(vim) editor to edit the .zshrc file.
1)To open ~/.zshrc
vi .zshrc
or
vi ~/.zshrc
or
You can open the file in VsCode, and it would be easier to edit it.
code .zshrc
2)To update the edited .zshrc file:
source ~/.zshrc
or
source .zshrc
If you are using zsh shell , run the below lines in the terminal:
echo 'setopt PROMPT_CR' >.zshrc
echo 'setopt PROMPT_SP' >.zshrc
echo 'export PROMPT_EOL_MARK=""' >.zshrc
You can edit zshenv instead of zshrc for appending PATH . Please check whether file already exists
cat ~/.zshevn
You can edit file using below command
vi ~/.zshenv
You can refer this to see how to add an entry in PATH
I am using Rails and for some reason unbeknownst to me I have to execute the following line every time I start the terminal in order to use ruby and rails.
source ~/.bash_profile
If I type the following before running the above command, it will recommend that I install the packages (ie "type 'sudo apt-get install package' to install")
rails -v && ruby -v && irb -v
Is there a way to make my terminal execute a command upon opening? Or, better yet, can anybody help explain the reason I have to run this line? I found an article that said I had to do that given my issue but it didn't explain why.
Assuming you're using the bash shell, then ~/.bash_profile will be sourced once (and only once) when you log in to the system but not each time you open a terminal window.
The ~/.bashrc, however, will be sourced every time a new shell is opened (i.e. when you open a terminal window).
So they are probably some environment variables settings in ~/.bash_profile which are required for ruby to run. Those settings should be moved to the ~/.bashrc file instead so they are defined in all shell instances.
Alternatively, source ~/.bash_profile from your ~/.bashrc (this is at your own risk, it may have side-effects).
I'm just getting into ruby and am trying to execute a walkthrough from Sam Ruby's Agile web development.
I've created a directory using mkdir work
Next i'm instructed to open a terminal and type rubys> cd work
The error I'm getting reads:
No command 'rubys' found, did you mean:
Command 'ruby' from package 'ruby' (main)
rubys: command not found
Can anyone inform me of what I'm doing wrong?
I've also tried changing from ~ to the work directory before entering my command.
In this book, rubys> is a command prompt, much like you have C:\> in the Windows terminal.
Ignore that first bit and everything should start working.
I guess you're doing it wrong.
mkdir work
creates a directory called "work". It has nothing to do with Ruby.
cd work
will then change into that directory. Forget about the rubys>.