0 Command Not Found Bash

[Carol Gudes]

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Hi Rebekeh. I did this course a few months back but I use Windows, and not a Mac, but I follow your logic in trying to resolve this. I see this same video has several other community posts from other users encountering the same problem.

1: As suggested in the video, make sure you have NPM and Node installed by typing which node followed by which npm. If successful, you should be shown the location of each installation.

I wasn't offering a solution but I am encouraging you to show us what you actually see when you type in these commands. I'm not a Mac expert but others who are, may be able to suggest the best way forward. I have since tried this on a Mac and it worked first time for me, but I have Googled about this and you are definitely not alone. One popular observation is that there may be a problem with your NPM installation and it is not successfully placing newly installed packages where they can be found in your $PATH. For comparison, here is what i see when i type in some specific commands...

Hi Steve. As mentioned, I'm primarily a Windows user and maybe I got lucky when I installed node and npm on my Mac some 2 years ago now. So I'm really hoping a knowledgeable Mac user can step in and offer advice. That said, when you tried typing both 'which node' and 'which npm' and these too failed to show signs of an installation, then maybe, just maybe, node is not installed.

In it, he explains why he recommends Mac users install an app called Brew. Not only can Brew be used to install Node, it can then be used to install Node packages (like http-server etc.). He observes that if you visit this link on a Mac...

I have website hosted on PythonAnywhere and I created a bash script that contains all the commands I need to run to update it. All of the commands seem to work except the "workon" command I use to start the virtualenv.

I found this post looking for a way to make the mongoDB shell work properly in bash, which I installed on Windows 10 as part of a git installation. Everything works, but whilst mongosh works perfectly using the Windows CLI, all the nice features of mongosh are lost in bash. Indeed, I found it quite error prone in bash, so I just keep on using it with the CLI.

Thanks, Krimier_Dan_Sanz. Your response prompted me to put some more effort to the problem, and I now found the solution that works best for me. I can simply run the mongosh shell in a Visual Studio Code terminal, and it works perfectly.

The Terminal window in RStudio uses 'Git Bash' by default. This is a very limited bash terminal which mainly functions to use command line Git. You can go to 'Tools --> Global Options --> Terminal' to change the default type of terminal to any other that you have on your system.

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Hello praveen, from my knowledge I think first you have to set the path in bash profile and then you have to run the bash profile and then start creating database dbca. If it is successfull Please send me a mail.

Thanks.

Randheer.

If that command not found means, you were not set the PATH in the PATH

variable to ORACLE_HOME/bin directory. PATH is a environment variable. when

ever if you execute any command it searches that command in the path, what

ever the path you specified in the PATH variable. you have to export

ORACLE_HOME/bin path to PATH variable. as follows

Whenever PATH is corrupted, you'll have to specify the full file paths to the tools you need. Explicitly. Or you'll need to use another session under a different user, or you can use a GUI-based shell-compatible text editor such as MacVim or TextWrangler. (You cannot use a GUI-based editor that write files that use any character encodings or file formats that the shell can't read.)

Here is a bash introduction and here is advanced bash scripting. (Those are the HTML versions, There are PDFs of those documents over there, too.) There is the Apple introduction to the command line (10.6) manual, and the 10.7 command line is little different from that of 10.6.

b) if you would get the same results should you rename your .bash_profile (and/or .bash_login, .profile, .bashrc) to something like saved.bash_profile, then restart your terminal session (basically eliminating any personalized shell customization).

The cat -vte will display invisible and control characters that you might not normally see as you type. If you keyboard is injecting extra junk when you type something, it will be visible after you enter on each line.

When you're trying to run a command (with or without sudo) and get an error message that reads "Command not found," this means the script or file you're trying to execute doesn't exist in the location specified by your PATH variable. What is this variable, and how can you run commands that it can't find?

In computing, a variable is a placeholder for a value that can change. You use variables every day in normal speech, although you don't think of them as such. When you say "my laptop," you're using "laptop" as a generic variable or placeholder for the computer you're carrying, regardless of whether it happens to be a Lenovo, Mac, or a Raspberry Pi in a fancy case.

Environment variables are special variables that contain information about your login session. Many of these variables are set by default during installation or user creation. They're stored for the system shell, applications, and scripts to use when executing commands.

Global variables come predefined in your login shell, but they aren't immutable and can be modified or deleted according to your preferences. You can use the printenv or env commands to display the environment variables on your system:

A local variable exists only within a specific shell. Therefore, when you define a local variable, it's only available in your current shell. It doesn't propagate or persist to a new shell session unless you export it as a global variable.

The PATH global environment variable lists the directories your system searches for valid, executable commands. By default, it contains standard directories that normally store executables like /usr/bin, /usr/local/bin, and so on.

When you type in a command, such as grep or vim, your system searches through all directories listed in your PATH variable, in the order that they're listed, until it finds an executable file by the same name. Should it fail to find one, it issues the "Command not found" error.

Not everything you want to execute needs to be in your path. You can execute files directly by specifying the path to the file you want to run. By identifying the file's location, you circumvent the need for your system to search your path at all.

Probably the simplest option, especially for one-off scripts or applications, is to tell Bash not to consider the PATH but rather to "look here." Do this by placing a dot and a slash in front of the command, script, or application name. For the hello script, it looks like this:

Sometimes when you try to use a command and Bash displays the "Command not found" error, it might be because the program is not installed on your system. Correct this by installing a software package containing the command. For example, if you don't have Nmap installed, then the nmap command fails when you type it into a terminal:

The PATH variable is a powerful tool you can use to customize how your system responds to commands, so take some time to get comfortable with it. It's frequently used when running commands to find the command executable.

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To fix the 'sudo command not found' error, you need to ensure that the sudo package is installed correctly. This can be achieved with the command which sudo apt-get install sudo. This bash error usually means that either the sudo package is not installed, or your PATH variable does not include the directory where sudo is located.

In this example, the which command checks if sudo is installed and returns its location if it is. If sudo is not found, the command after the operator runs, which installs sudo using apt-get install sudo.

This is a quick fix, but understanding why this error occurs and how to prevent it requires a deeper understanding of bash and the sudo command. Continue reading for a detailed guide on troubleshooting and understanding this issue.

Finally, understanding the difference between absolute and relative paths can help you troubleshoot PATH-related issues. An absolute path starts from the root directory (e.g., /usr/bin/sudo), while a relative path starts from the current directory (e.g., ./sudo).

The Bash shell is a command interpreter for Linux systems. When you type a command in Bash, it interprets the command and executes the associated program. This process involves searching for the program in the directories listed in your PATH variable.

The principle of least privilege is a computer security concept in which a user is given the minimum levels of access necessary to complete his/her job functions. The sudo command in Linux is an embodiment of this principle.

The sudo command allows a permitted user to execute a command as the superuser or another user, as specified in the sudoers file. This allows users to perform tasks that require higher privileges without having to log in as the root user.

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