linux ls command to list file with certain characters in filename

I have files with name

145345000_abcd_20211201
100045430_abcd_20211130
143240000_abcd_20211129

in this (_abcd_) remains constant rest of the numbers in beginning and timestamp at the end changes every day. i want to list all such files in a txt file I am doing the following

ls ${mypath}/ > ${mypath}/my_list.txt

this will list all files and folder in mypath where I want only file with (abcd) in file name please guide. I Have tried many combinations already

Answer

Use grep to filter the files with abcd like this:

ls ${mypath}/ | grep abcd > ${mypath}/my_list.txt

Alternatively, you can use ls only like this:

ls -1 ${mypath}/*abcd* > ${mypath}/my_list.txt