Use command to list files in the lammps-7Aug19 directory

[u1@node1 lammps-7Aug19]$ find

Count the number of files by piping the list to wc to count the files.

[u1@node1 lammps-7Aug19]$ find | wc -l
14717

Count the the directories listing by piping the list to wc to count the directories

[u1@node1 lammps-7Aug19]$ find -type d | wc -l
672

Count the list of files that matched the wildcard pattern *.mov that are larger than 1M by piping to wc to count

[u1@node1 lammps-7Aug19]$ find -type f -name "*.jpg" -size +1M |wc -l

Find and match files or directories whose contents or attributes were last modified more recently than those of “mybasefile”

[u1@node1 lammps-7Aug19]$ find -type f -name "*.jpg" -cnewer mybasefile

Find empty files in the lammps-7Aug19 directory

[u1@node1 lammps-7Aug19]$ find -type f -empty

Find files or directories that belongs to username

[u1@node1 Downloads]$ find -type f -user root |wc -l
1572

References:

1. The Linux Command Line