Listing files with an certain extension

Shell Programming and Scripting
1

I'm suppose to write a command that would list all files that end in .tx with an optional t at the end.

So far all I got is listing the files that end in .tx which is:

ls *.tx

Now my problem is how do I add the optional t at the end.

2

Try:

ls *.tx *.txt
3

Try:

[s]```text
ls *.tx[t]


EDIT:
Oops, was too certain it would work.

Try this instead:
```text
ls *.{tx,txt}

hth

4

Note: brace expansion ( {foo,bar} ) is supported by bash/ksh93/zsh