What is the difference between rm -r and rm? [closed] - terminal

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Can rm be used for directories as well? I know that the -r means recursively but in terms of functionality, how are the 2 commands different?

Without -r, rm only deletes the named files (and not directories). With -r, as you say, it's recursive and will delete both files and directories, both in and under the named directories.

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What is the best way to compare two directories in Windows 10? [closed]

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I have two similar directories with slightly different file contents. Is there a good way on Windows to compare the contents of two directories like the Linux diff command?
You can use BeyondCompare the diff tool to compare the contents of different directories, but you need to install it first.

Bash - removing characters other than specific string [closed]

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I use wget -O to get the site text to a specific file.
It saves the file within ONE line. File has about 2 milion characters. After, I would like to remove any other characters different from "directory= ************" format (including quotation mark, **** stand for any text till second quotation mark).
Is there any smart way to acomplish that?
grep -o '"directory= [^"]*"' file
The smartest way would be to pipe it out to a smarter interpreter. Python for instance.
Python has a great regular expressions library at your disposal.

How to find files with duplicated content in given a directory? SHELL [closed]

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I need to find files with the same (duplicated) content inside them in a given directory. And I need to use shell code.
Try this: BASH
find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33 | cut -c 35-
Explanation:
Find all files, calculate their MD5SUM, find duplicates by comparing the MD5SUM, print the names

What happens to files that are mmv-ed by 2 different scripts run at the same time? [closed]

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let's say I have 2 different scripts that do a mmv on files from the same directory but to different target directories.
They are run at the same time (cron).
What happens to the files that match mmv's pattern ? Are they scattered in both target directories ?
This is a timing question. Who moves them first is the winner.
It makes a difference here if you move them to a directory within the same file system where just the entries are moved or across file systems, where the file is copied and then removed.
Unpredictable result:
The first (there is always a first) would success,
The laters would fail -> generate some error report.

How can I optimize my files deletion under windows? [closed]

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What is happening behind the scenes when I delete several files on Windows?
Assuming that my code deletes several files in a loop, I guess there should be some kind of optimization to access the MFT. How exacly does this works?
What are the best practices for optimal file deletion?
Deleting massive numbers of files is an infrequent operation on Windows, so it appears there is no support for optimizing this use case. The best you can do is delete all the files individually.
If all the files are in a single directory, you may try Directory.Delete
Otherwise, you may also try IFileOperations.

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