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[fdupes][1] can do this. From man fdupes:

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

In Debian or Ubuntu, you can install it with apt-get install fdupes. In Fedora/Red Hat/CentOS, you can install it with yum install fdupes. On Arch Linux you can use pacman -S fdupes, and on Gentoo, emerge fdupes.

To run a check descending from your filesystem root, which will likely take a significant amount of time and memory, use something like fdupes -r /.

As asked in the comments, you can get the largest duplicates by doing the following:

fdupes -r . | {
    while IFS= read -r file; do
        [[ $file ]] && du "$file"
    done
} | sort -n

This will break if your filenames contain newlines.

[1]: https://github.com/adrianlopezroche/fdupes  

fdupes can do this. From man fdupes:

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

In Debian or Ubuntu, you can install it with apt-get install fdupes. In Fedora/Red Hat/CentOS, you can install it with yum install fdupes. On Arch Linux you can use pacman -S fdupes, and on Gentoo, emerge fdupes.

To run a check descending from your filesystem root, which will likely take a significant amount of time and memory, use something like fdupes -r /.

As asked in the comments, you can get the largest duplicates by doing the following:

fdupes -r . | {
    while IFS= read -r file; do
        [[ $file ]] && du "$file"
    done
} | sort -n

This will break if your filenames contain newlines.

fdupes can do this. From man fdupes:

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

In Debian or Ubuntu, you can install it with apt-get install fdupes. In Fedora/Red Hat/CentOS, you can install it with yum install fdupes. On Arch Linux you can use pacman -S fdupes, and on Gentoo, emerge fdupes.

To run a check descending from your filesystem root, which will likely take a significant amount of time and memory, use something like fdupes -r /.

As asked in the comments, you can get the largest duplicates by doing the following:

fdupes -r . | {
    while IFS= read -r file; do
        [[ $file ]] && du "$file"
    done
} | sort

This will break if your filenames contain newlines.

[fdupes][1] can do this. From man fdupes:

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

In Debian or Ubuntu, you can install it with apt-get install fdupes. In Fedora/Red Hat/CentOS, you can install it with yum install fdupes. On Arch Linux you can use pacman -S fdupes, and on Gentoo, emerge fdupes.

To run a check descending from your filesystem root, which will likely take a significant amount of time and memory, use something like fdupes -r /.

As asked in the comments, you can get the largest duplicates by doing the following:

fdupes -r . | {
    while IFS= read -r file; do
        [[ $file ]] && du "$file"
    done
} | sort -n

This will break if your filenames contain newlines.

[1]: https://github.com/adrianlopezroche/fdupes  

fdupes can do this. From man fdupes:

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

In Debian or Ubuntu, you can install it with apt-get install fdupes. In Fedora/Red Hat/CentOS, you can install it with yum install fdupes. On Arch Linux you can use pacman -S fdupes, and on Gentoo, emerge fdupes.

To run a check descending from your filesystem root, which will likely take a significant amount of time and memory, use something like fdupes -r /.

As asked in the comments, you can get the largest duplicates by doing the following:

fdupes -r . | {
    while IFS= read -r file; do
        [[ $file ]] && du "$file"
    done
} | sort

This will break if your filenames contain newlines.

fdupes can do this. From man fdupes:

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

In Debian or Ubuntu, you can install it with apt-get install fdupes. In Fedora/Red Hat/CentOS, you can install it with yum install fdupes. On Arch Linux you can use pacman -S fdupes, and on Gentoo, emerge fdupes.

To run a check descending from your filesystem root, which will likely take a significant amount of time and memory, use something like fdupes -r /.

As asked in the comments, you can get the largest duplicates by doing the following:

fdupes -r . | {
    while IFS= read -r file; do
        [[ $file ]] && du "$file"
    done
} | sort

This will break if your filenames contain newlines.