Questions[filename](ubuntu)

I have around 180 files with the same structure: 000-aaaaaaaa.txt.

Regular expression for a file name: /^[0-9]{3}\-[a-zA-Z]+$/gi (3 digits + - + letters + .txt).

I would like to cut of the numeral part and - in each file name

For example

• 000-hello.txt -> hello.txt
• 001-world.txt -> world.txt
• 002-ubuntu.txt -> ubuntu.txt
• 003-linux.txt -> linux.txt

In the image below, only "input method" has the full name; other applications' names are shortened with an ellipsis (…). Why is this? Can it be fixed?

How can one change the first letter of a filename to uppercase using a command line?
IS there any command line to do so?

I was wondering what's the need to put executable commands inside a .sh file to make a single script, since I can do the same by putting the commands inside a .txt file and making it executable using chmod.

I'm assuming this can be done with any of the file extensions. So, I am quite confused about the need for .sh extension. Any help would be much appreciated.

I want to enter the following folder in the terminal:

Milano, Torino (Jan)-Compressed

How should I write the command cd to enter this directory?

Spaces and several other special characters like \, *, ), ( and ? cause problems when I try to use them in the command line or scripts, e.g.:

$ cd space dir
bash: cd: space: No such file or directory

$ cat space file
cat: space: No such file or directory
cat: file: No such file or directory

$ cat (
bash: syntax error near unexpected token `newline'

$ echo content >\
> ^C

$ ls ?
(  )  *  ?  \

How do I enter file or directory names that contain special characters in the terminal in general?