I am doing prep work for app academy. The final stage before I am done with my prep work is to complete a ruby intro course called "Test First Ruby".
The first line after you install Rspec is to enter the course directory. In the terminal it is "cd learn_ruby", simple enough, except it returns back a message that says "the system cannot find the path specified". I have been noticing this message on certain commands for all of my ruby learning thus far and I am just wondering what does this mean? And how can I fix this?
Any help would be great.
cd means 'change directory'. The error you are getting is that the directory is not existant in the location your command line is in.
This looks like a reasonable intro to UNIX filesystem: http://www.doc.ic.ac.uk/~wjk/UnixIntro/Lecture2.html
UNIX reference: http://sunsite.utk.edu/UNIX-help/quickref.html
Create the directory before you cd into it:
mkdir learn_ruby
cd learn_ruby
Do check out AJcodez's links to familiarize yourself with Unix filesystem commands.
Related
I'm trying to follow a walkthrough and this is one of the steps, "go to that same folder in Terminal (if you can't do that you should probably quit now)" I'm not very familiar with Mac's Terminal, but don't feel like quitting. If it helps, I need to run a grep -r "what I'm looking for" command on the file. I really have no idea what I need to do to run that command, but the rest of the walkthrough is pretty thorough, so I know I can follow the next few steps.
You need to move to the directory where that file is stored, for this the command is cd. For example lets say the file is located in a directory names MyDir in the Desktop, the command will be
cd /Users/{YOUR_USERNAME_HERE}/Desktop/MyDir
You can run ls command here to check if the file is actually present in this directory or not
Very inexperienced Ruby student here.
I’m not sure how to write a Ruby program in Atom, save it then try to run it in the terminal (Mac OSX).
Could someone run me through the absolute basics, please?
Forgive my cluelessness!
Ruby programs generally use the '.rb' extension, so in order to run a ruby file that you've written, you need to save it somewhere with that extension first- eg. 'my-app.rb'.
It's a good idea when starting out to save it in a folder inside your "Home" directory (/Users/your user name/). You can find that in the mac "Finder" by clicking on the folder on the left hand list that's named "your username". In your terminal, your home directory is shortened to '~/' - and you can easily change directory into it with that shortcut:
cd ~
While I've been learning, I've stuck to a quick, short directory to store my files- '~/code/'. Anything will do, but it's much quicker to type 'cd ~/code/my-app.rb' than to type something long like 'cd ~/Documents/Programming/Ruby/my-app.rb' every time. So when you're deciding on where to save, think about how much you'll have to type in terminal! :)
Once you've saved your file, and used 'cd' to change into the directory you've saved it in, you use the command 'ruby' to run it.
ruby my-app.rb
That's about all there is to actually running your file! There's so much more to using the terminal, and writing code- but there's plenty of info out there on how to start.
I found Chris Pine's "Learn To Program" really simple and easy to follow. There are plenty of other resources out there, too! Try out Try Ruby to get going straight in your browser.
I am trying to run a bash file from install4j6. install4j does indeed try to run the bash file but it just returns an error at the end of the installation. The error is very generic and has no code reference or anything that will help me determine a solution - just a message that says "Error while executing file."
The only thing I can provide is how I have it setup in install4j6 since I am pretty sure that's my issue.
The bash file is defined in the root of my installation directory distribution tree and is named set_permissions.sh. For the sake of eliminating permissions being a cause, the file permission mode is set to 777 (both in install4j and on the file system).
I believe the issue is related to what I have set as my "working directory". I currently have it set to just ".". Is there a way to debug this further? Maybe get an actual error as to why it's not executing?
Ok, first a few things to check:
make sure that you're running the batch file after the install files step (you mention it being at the root of your install)
best to have the wait for termination checked and a variable for the return code.
redirect stderr to the log file (just in case)
As for working directory, . should work, but you can change it to ${installer:sys.installationDir} to make sure that it references the installation directory chosen by the user. You can also set the executable in the form of ${installer:sys.installationDir}\set_permissions.sh
Also, try and run just your shell script to make sure that it works :)
I did try to find the answer online but unfortunately came up empty handed. Searching for './' in combination with other keywords brings up many hits, but none that helped...
Anyhow, as you can probably tell, I am rather new to MacOs. I am running mongo from the shell.
I cd into the /bin folder and start the mongo daemon with:
'./mongod'
.
If I just enter 'mongod', I get the following error:
'-bash: mongod: command not found'
What does the
'./'
in './mongod' stand for? Why is it needed? Why can't I just execute mongo by typing mongod. After all, I am in the correct directory.
After all, I am in the correct directory
But that directory isn't in the PATH. The gist of the matter is that when the shell wants to execute something it looks into a list of directories (specified in a variable called PATH). And the current directory isn't in that list.
As explained in the answer by cnicutar the shell tries to match the command you enter with executables in the directories that are listed in the PATH environment variable.
Although you could add the current directory to the PATH, it's probably not a good idea to do it. This article gives some good reasons why Linux doesn't add it by default:
Its a measure to plug possible security holes. You can't run commands
in the current directory without specifically calling them.
ie ./myscript.sh
To stop nasties writing a vicious shell script, placing the script in
an innocent location such as /tmp and getting root to run the script.
Would root run a nefarious script? If the script was named 'ls' and
root did a listing, the script would automatically run.
First off I am very very new to shell scripting. I am trying to write a script that takes in one parameter and then copies a folder in a different directory naming it using the parameter. This is the current code that I have:
#!/bin/sh
cd /var/www/html/fbplugin/chrome
sudo mkdir temp/$1
sudo cp -rf "/var/www/html/fbplugin/chrome/fbplugin" "/var/www/html/fbplugin/chrome/temp/$1"
When I run this code it says can't cd to /var/www/html/fbplugin/chrome. I'm not sure why it is saying this because I know the directory exists. I have copied the line directly and it works in terminal. If anyone could help me out that would be great.
If it matters in order to run the script I am typing "sh build.sh"
If that directory really exists, then you must have executed that script with a different user (cron, webserver, etc).
Check the rights for that directory.
I don't know why you're getting the error about cd, but it looks like you could just use absolute paths throughout. That would solve the larger problem of the script working correctly.