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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.

  • sorry I meant ls *.tx that would work – shawn edward Feb 9 '16 at 22:18
  • how would I use it in this case? – shawn edward Feb 9 '16 at 22:22
  • What do you expect in here? To list files ending in .tx and .txt or really want to know if an "optional" character can be attached? – tachomi Feb 9 '16 at 22:27
  • @tachomi like I already under how to show files ending in .tx but what command will list files that end in .tx with an optional t at the end – shawn edward Feb 9 '16 at 22:31
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In bash with shopt -s extglob you can do this:

ls *.tx?(t)

In bash with shopt -s nullglob you can do this:

ls *.txt *.tx

But this will show the directory content if no such file exists.

If ls is not required:

find . -type f -name '*.txt -name '*.tx'

This would show files in subdirectories, too. With GNU find this can be avoided with find . -maxdepth 1.

  • is there a way to do it without the shopt -s extglob – shawn edward Feb 9 '16 at 22:36

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