Terminal Help please

[jumbobombo]

Heyyy guys i am new here and i need help with some terminal commands
I am completely new to the linux world and want to learn
This is what my sir in college told me to do

1. Find all files in a recursively in a directory whose name starts with the letter A or B and which were modified 3 days ago.
so in my current directory i wrote in terminal :

find . \(-name 'A*' -o -name 'B*' \) -print

So this gave me all the files starting with A or B. and the 3 days ago part i used

mtime 3

but it gives error

2. Find all directories in a file system which contain html or pdf files and create a list of such directories in a file
so same as previous :

find . \(-name '*.pdf' -o -name '*.html' \) -print

But i couldnt figure out how to save all the directories in a file

3. Find all image files in your file system with a size greater than 10kb and whose name contains any vowels

find . \-name '*.iso' -size +10k

So in this how should i go about with vowels?

4. And the directories which i find on the terminal i need to copy them in the same hierarchy to another location in the file system
How should i do that?

Please help me with these problems.
I am completely new to ubuntu

Thanks in advance

[Vaphell]

1. it's -mtime 3 not mtime 3

2. your command finds files not directories
you have to get the directory part of the path (probably something with -exec) and probably ignore duplicates (read about pipes and look at sort command)
you can redirect output to file with > file.txt at the end
also, use -iname (case insensitive -name) instead of -name, unless you don't mind not getting .PDF in results

3. globs (patterns matching files/directories) support [abc] syntax which means a or b or c. It's easy to figure out how to describe a vowel using that feature.
-iname again

4. most likely find -exec <recursive copy> but what should happen when matching folders are in parent-child relation? should the child be copied twice (once as subfolder, once as a match?)

[jumbobombo]

1. it's -mtime 3 not mtime 3

2. your command finds files not directories
you have to get the directory part of the path (probably something with -exec) and probably ignore duplicates (read about pipes and look at sort command)
you can redirect output to file with > file.txt at the end
also, use -iname (case insensitive -name) instead of -name, unless you don't mind not getting .PDF in results

3. globs (patterns matching files/directories) support [abc] syntax which means a or b or c. It's easy to figure out how to describe a vowel using that feature.
-iname again

4. most likely find -exec <recursive copy> but what should happen when matching folders are in parent-child relation? should the child be copied twice (once as subfolder, once as a match?)

Heyy thanks a lot for your reply

1. Solved

2. Solved the command which i mentioned also gives me the directories so its ok

3. What is globs? I did not get this part

4. I did not understand this either, Earlier you mentioned the file.txt if that writes the output in a file i think that it should do

Thanks a lot for your reply sir

[Vaphell]

2. you are not pushing yourself
/some/dir1/file1.pdf
/some/dir1/file2.pdf
/some/dir1/file3.pdf
/some/dir2/file1.html
/some/dir2/file2.html
/some/dir2/file3.html
doesn't look like a directory list to me.
I'd imagine that to pass this exercise you need to get
/some/dir1/
/some/dir2/
any other option is lame

3. globs are these things that match file/dir names, you know, *.txt, *.pdf, something*.html, *something*... They support [] which lists a fixed list of allowed characters, eg. [abc]* will match everything that starts with a or b or c.

4. if i understand correctly, you have to find dirs and copy them to another location, not dump to file, am i right? That's not the same thing.