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How to change the directories in a bash script?
With the value set as shown, you can do: and, if there is no sub-directory called java in the current directory, then it will take you directly to $HOME/projects/java – no aliases, no scripts, no dubious execs or dot commands. A bash script operates on its current environment or on that of its children, but never on its parent environment.
Is there a way to change the parent shell Directory?
The script is run in a subshell, and cannot change the parent shell working directory. Its effects are lost when it finishes. To change the current shell’s directory permanently you should use the source command, also aliased simply as., which runs a script in the current shell environment instead of a sub shell.
Why can’t I change directories using ” CD ” in a script?
Shell scripts are run inside a subshell, and each subshell has its own concept of what the current directory is. The cd succeeds, but as soon as the subshell exits, you’re back in the interactive shell and nothing ever changed there. You’re doing nothing wrong!
Why is my shell running in a new directory?
You are making a thinking error. While the current shell stays in the same directory, the script has moved to the new directory. You could see that by creating another script in the new directory, and running it from your script, after it has changed directory: The second script would run from the new directory.
How to use ” CD ” in a bash script?
You can just type this in or put it in one of the various shell startup files. The cd is done within the script’s shell. When the script ends, that shell exits, and then you are left in the directory you were. “Source” the script, don’t run it. Instead of: (Notice the dot and space before the script name.) Then create an alias in your startup file.
How to change the Directory of the shell?
To change the current shell’s directory permanently you should use the sourcecommand, also aliased simply as., which runs a script in the current shell environment instead of a sub shell. The following commands are identical:
How does a script change the environment in Bash?
By making your program a shell function, you are adding your own in-process command and then any directory change gets reflected in the shell process. When you start your script, a new process is created that only inherits your environment. When it ends, it ends. Your current environment stays as it is.