Linux find command returns nothing

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The glob /home/linux/txt/output/ABC_DEFGH* cannot filter for file age.
But you can do all with find, even limit the search depth

Code:

if cd /home/linux/txt
then 
  find . -maxdepth 1 -type f -name 'ABC_DEFGH*.*' -mtime +20 -print
fi

An old Unix find that does not know -maxdepth can emulate -maxdepth 1 with -prune

Code:

  find . \! -name . -prune -type f -name 'ABC_DEFGH*.*' -mtime +20 -print

The -print can be replaced with -delete if the find supports it, otherwise with -exec rm {} +

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