mjhjmtu

I am supposed to use ls to find files that end in a certain letter, but it does not matter if the file has an extension or not.

For example, I want it to do this

> ls
test test.txt test.ascii other.txt

> ls [something]
test test.txt test.ascii

So that I can find files that end with a 't', but it doesn't include the file where the extension ends in t

Edit:
I am supposed to assume that the only period characters in the filename will be for the extension and there will be no others

something=

 |grep -e ".*t.[^.]*" -e "^[^.]*t$"

If you are using the bash shell, you can use the extglob option to do a complex filter. For example:

Solution:

bash$ shopt -s extglob

bash$ ls
other.txt test test.ascii test.txt

bash$ ls *@(t.*|[^.]?[[:alnum:]]t)
test test.ascii test.txt

Explanation:

PATTERN1 (t.*) matches any file ending with a "t" followed by a file extension:

bash$ ls *@(t.*)
test.ascii test.txt

PATTERN2 ([^.]?[[:alnum:]]t) matches any file that does NOT have a dot, followed by zero or more alphanumeric chars, and ending in a "t". This matches files that do not have a file extension:

bash$ ls *@([^.]?[[:alnum:]]t)
test

The glob @(PATTERN1|PATTERN2) matches either pattern exactly once. The combined pattern filters out only what we're looking for.

For more info on bash patterns, see: http://wiki.bash-hackers.org/syntax/pattern

Assuming you need files with only one dot (extension) and

Assuming that you need to search on the present directory (./) you may use:

$ find . -maxdepth 1 -type f -regex './[^.]*t(.[^.]*)?'
./test.txt
./test.ascii
./test

This could be used but will include directories (and will fail if filenames have newlines):

$ printf '%sn' * | grep -e ".*t.[^.]*" -e "^[^.]*t$"
test
test.ascii
test.txt
tt

To allow filenames with newlines use (GNU grep):

$ printf '%s' * | grep -ze ".*t.[^.]*" -e "^[^.]*t$" | xargs -0
test test.ascii test.txt tt