Commands by masterofdisaster (5)

  • When you have different digital cameras, different people, friends and you want to merge all those pictures together, then you get files with same names or files with 3 and 4 digit numbers etc. The result is a mess if you copy it together into one directory. But if you can add an offset to the picture number and set the number of leading zeros in the file name's number then you can manage. OFFS != 0 and LZ the same as the files currently have is not supported. Or left as an exercise, hoho ;) I love NF="${NF/#+(0)/}",it looks like a magic bash spell.


    2
    OFFS=30;LZ=6;FF=$(printf %%0%dd $LZ);for F in *.jpg;do NF="${F%.jpg}";NF="${NF/#+(0)/}";NF=$[NF+OFFS];NF="$(printf $FF $NF)".jpg;if [ "$F" != "$NF" ];then mv -iv "$F" "$NF";fi;done
    masterofdisaster · 2010-11-08 22:48:56 4
  • Nice reading in the morning on the way to work, but sadly the .tar.gz for the whole issue 66 is not on phrack's website yet. So use wget to download.


    2
    mkdir phrack66; (cd phrack66; for n in {1..17} ; do echo "http://www.phrack.org/issues.html?issue=66&id=$n&mode=txt" ; done | xargs wget)
    masterofdisaster · 2009-06-11 21:42:42 3
  • What do you do when nmap is not available and you want to see the hosts responding to an icmp echo request ? This one-liner will print all hosts responding with their ipv4 address.


    3
    ( nw=192.168.0 ; h=1; while [ $h -lt 255 ] ; do ( ping -c2 -i 0.2 -W 0.5 -n $nw.$h & ); h=$[ $h + 1 ] ; done ) | awk '/^64 bytes.*/ { gsub( ":","" ); print $4 }' | sort -u
    masterofdisaster · 2009-06-07 15:14:46 3
  • Sort ls output of all files in current directory in ascending order Just the 20 biggest ones: ls -la | sort -k 5bn | tail -n 20 A variant for the current directory tree with subdirectories and pretty columns is: find . -type f -print0 | xargs -0 ls -la | sort -k 5bn | column -t And finding the subdirectories consuming the most space with displayed block size 1k: du -sk ./* | sort -k 1bn | column -t


    6
    ls -la | sort -k 5bn
    masterofdisaster · 2009-06-07 14:35:17 5
  • This one-liner will the *delete* without any further confirmation all 100% duplicates but one based on their md5 hash in the current directory tree (i.e including files in its subdirectories). Good for cleaning up collections of mp3 files or pictures of your dog|cat|kids|wife being present in gazillion incarnations on hd. md5sum can be substituted with sha1sum without problems. The actual filename is not taken into account-just the hash is used. Whatever sort thinks is the first filename is kept. It is assumed that the filename does not contain 0x00. As per the good suggestion in the first comment, this one does a hard link instead: find . -xdev -type f -print0 | xargs -0 md5sum | sort | perl -ne 'chomp; $ph=$h; ($h,$f)=split(/\s+/,$_,2); if ($h ne $ph) { $k = $f; } else { unlink($f); link($k, $f); }' Show Sample Output


    19
    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 --
    masterofdisaster · 2009-06-07 03:14:06 7

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Recursively remove 0kb files from a directory

Shows space used by each directory of the root filesystem excluding mountpoints/external filesystems (and sort the output)
Excludes other mountpoints with acavagni's "mountpoint" idea, but with -exec instead of piping to an xargs subshell. Then, calling "du" only once with -exec's "+" option. The first "\! -exec" acts as a test so only those who match are passed to the second "-exec" for du.

mplayer webcam window for screencasts
When recording screencast some people like to have the image from their webcam, so the can show something, that can't be seen on the desktop. So starting mplayer with these parameters you will have a window with no frames, borders whatsoever, and selecting the window a hitting the "F" key you will bring it in fullscreen. if you want to position the frame somewhere else, you could play with the --geomeptry option where 100%:100% mean bottom right corner. The HEIGHT and WIDTH can't be changed as you like, since the most webcams support specified dimensions, so you would have to play with it to see what is supported

Alternative for basename using grep to extract file name
Here's a bash version.

Easily find latex package documentation
If the pdf/dvi/etc documentation for a latex package is already part of your local texmf tree, then texdoc will find and display it for you. If the documentation is not available on your system, it will bring up the package's webpage at CTAN to help you investigate.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

put all lines in comment where de word DEBUG is found

Delete all flash cookies.
Maybe you want first check which files will be deleted: $ find $HOME -name '*.sol' -exec echo rm {} \;

Cleanup debian/ubuntu package configurations
Sometimes, simpler is better.

sends your internal IP by email
This is useful if you have need to do port forwarding and your router doesn't assign static IPs, you can add it to a script in a cron job that checks if you IP as recently changed or with a trigger script. This was tested on Mac OSX.


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