====== File - Fu ======

Con este comando puedo saber las características de un archivo, vídeo o
directorio:

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Display a numbered list of 50 biggests files sorted by size (human
readable)

    du -ah | sort -hr | head -n50 | cat -n

Create a large test file (sparse, taking no space).

    dd bs=1 seek=2TB if=/dev/null of=ext3.test

Untar undo

    tar tfz filename.tgz |xargs rm -Rf

Create a file of a given size in linux

    dd if=/dev/zero of=foo.txt bs=1M count=1
    dd if=/dev/zero of=sparse_file bs=1024 skip=1024 count=1

Find all files with root SUID or SGID executables

    sudo find / -type f \( -perm /4000 -a -user root \) \
        -ls -o \( -perm /2000 -a -group root \) -ls

Find today created files

    find -maxdepth 1 -type f -newermt "00:00" -printf "%f\n" | sort

DELETE all those duplicate files but one based on md5 hash comparision
in the current directory tree

    find . -type f -print0|xargs -0 md5sum|sort|\
        perl -ne 'chomp;$ph=$h;($h,$f)=split(/\s+/,$_,2);
                  print "$f"."\x00" if ($h eq $ph)'|\
        xargs -0 rm -v --

Start dd and show progress every X seconds

    dd if=/path/to/inputfile of=/path/to/outputfile & pid=$! && \
        sleep X && while kill -USR1 $pid; do sleep X; done