Linuxteaching
- What is Shopt in bash?
- How do I customize my shell prompt?
- What is Shopt Dotglob?
- How do I enable Shopt?
- What is bash set?
- What is Nullglob?
- How do I change the background color in bash?
- What is a shell prompt?
- How do I know which Linux shell?
- Which command toggles the values of variables controlling optional shell behavior?
- What is Globstar?
- What is Shopt Nocasematch?
What is Shopt in bash?
On Unix-like operating systems, shopt is a builtin command of the Bash shell that enables or disables options for the current shell session.
How do I customize my shell prompt?
- Open the BASH configuration file for editing: sudo nano ~/.bashrc. ...
- You can change the BASH prompt temporarily by using the export command. ...
- Use the –H option to display a a full hostname: export PS1="uH " ...
- Enter the following to show username, shell name, and version: export PS1="u >sv "
What is Shopt Dotglob?
In bash, shopt -s dotglob is the only way of matching every file in the directory without accidentally matching . or .. . However, fish shell can never match . or .. with globs, therefore that's not an issue (if you seriously need to match . or .. for some silly reason, just say them explicitly).
How do I enable Shopt?
To set and unset shopt options, use the following commands:
- -s: Set, or enable.
- -u: Unset, or disable.
What is bash set?
set is a shell builtin, used to set and unset shell options and positional parameters. Without arguments, set will print all shell variables (both environment variables and variables in current session) sorted in current locale. You can also read bash documentation.
What is Nullglob?
Nullglob is what you're looking for. Nullglob, quoting shopts man page, “allows filename patterns which match no files to expand to a null string, rather than themselves”. ... With failglob enabled, quoting again, “patterns which fail to match filenames during filename expansion result in an expansion error”.
How do I change the background color in bash?
Run the following command to display the current bash prompt. You can change the current bash prompt default format, font color and background color of terminal permanently or temporary.
...
Bash text and background printing in different colors.
| Color | Code for making normal color | Code for making Bold color |
|---|---|---|
| Yellow | 0;33 | 1;33 |
What is a shell prompt?
The shell prompt (or command line) is where one types commands. When accessing the system through a text-based terminal, the shell is the main way of accessing programs and doing work on the system. In effect, it is a shell surrounding all other programs being run.
How do I know which Linux shell?
Use the following Linux or Unix commands:
- ps -p $$ – Display your current shell name reliably.
- echo "$SHELL" – Print the shell for the current user but not necessarily the shell that is running at the movement.
Which command toggles the values of variables controlling optional shell behavior?
4.3. 2 The Shopt Builtin. This builtin allows you to change additional shell optional behavior. Toggle the values of settings controlling optional shell behavior.
What is Globstar?
The globstar allows you to specifiy an unknown number of in-between directories, like so: "a/**/*.js" a/b/app.js => MATCH a/b/c/app.js => MATCH a/app.js => MATCH a/b/c/d/e/f/g/h/i/j/app.js => MATCH other/app.js => NO MATCH.
What is Shopt Nocasematch?
Turn it off with shopt -u nocasematch. From the Bash Reference Manual: nocasematch. If set, Bash matches patterns in a case-insensitive fashion when performing matching while executing case or [[ conditional commands.
