Here are two commands used for file and directory comparisons. Diff is for files and dircmp is for directories. Personally, I routinely use the diff command to compare files. Here are examples of their use.
Compare two files
# diff file1 file2
Show file differences a screenful at a time if output is greater than a screen
#diff files1 files2 | pg
Compare two directories
#dircmp dir1 dir2
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