Find the files existing in one directory but not in the other [closed]

linux bash diff

diff -r dir1 dir2 | grep dir1 | awk '{print $4}' > difference1.txt

Explanation:

diff -r dir1 dir2 shows which files are only in dir1 and those only in dir2 and also the changes of the files present in both directories if any.
diff -r dir1 dir2 | grep dir1 shows which files are only in dir1
awk to print only filename.

linux bash diff

This should do the job:

diff -rq dir1 dir2

Options explained (via diff(1) man page):

linux bash diff

comm -23 <(ls dir1 |sort) <(ls dir2|sort)

This command will give you files those are in dir1 and not in dir2.

About <( ) sign, you can google it as 'process substitution'.

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