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Linux, programming and more

‘Argument list too long’

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root@web2:$ rm pe-warn-*.bz2
-bash: /bin/rm: Argument list too long

This peoblem happens when you are trying to delete too many files in a directory at the same time – it seems rm has special limits …

To solve the problem:
Use:

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find . -name 'pe-warn-*.bz2' | xargs rm

or

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find . -name "pe-warn-*.bz2" -delete

Data Recovery

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Each of you looses already some important files like photos or important documents.
After a normal Windows crash it’ s not a problem to get all your data back.
I show you some methods to get your data back.

These two examples are taken directly from the ddrescue info pages.

Example 1: Rescue an ext3 partition in /dev/hda2 to /dev/hdb2

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dd_rescue /dev/hda2 /dev/hdb2 -l logfile.txt
e2fsck -v -f /dev/hdb2
mount -t ext3 -o ro /dev/hdb2 /mnt

If you have a damaged hard disk /dev/sda1 and you have an empty space hard disk /dev/sdb1 You can copy data from /dev/sda1 to /dev/sdb1 use the following commnd

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dd_rescue /dev/sda1 /dev/sda2/backup.img
# To mount use:
mount -t ext3 /dev/sda2/backup.img mnt/ -o loop

Example 2: Rescue a CD-ROM in /dev/cdrom

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ddrescue -b 2048 /dev/cdrom cdimage logfile

SSH trick to improve your system security

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This ASCII-art graph represents your host’s public key, which uniquely identifies (or at least, it better damn should uniquely identify!) it. This representation was added mainly because it is way easier to be able to visually record the shape of your most frequently used hosts.

Enable visualization for hostkeys:

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id@acer:~$ cat .ssh/config 
VisualHostKey   yes
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id@acer:~$ ssh root@192.168.1.3
Host key fingerprint is b6:dc:cb:ff:33:83:aa:03:56:94:0c:bc:7f:38:cf:b7
+--[ RSA 2048]----+
|     ..o .       |
|      . +        |
|       o         |
|      . .        |
|       oS.       |
|      oo+o.      |
|     . .o=.  .   |
|        ..o.o +  |
|        .o++Eo.+ |
+-----------------+
root@192.168.1.3's password: 
Linux piper 2.6.26-2-xen-686 #1 SMP Mon Jun 21 10:37:05 UTC 2010 i686

Star Wars anthem – pc speaker

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Really imperial march through the motherboard speaker:

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aptitude update ; aptitude install beep

And now execute this fun:

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beep -l 350 -f 392 -D 100 --new -l 350 -f 392 -D 100 --new -l 350 -f 392 -D 100 --new -l 250 -f 311.1 -D 100 --new -l 25 -f 466.2 -D 100 --new -l 350 -f 392 -D 100 --new -l 250 -f 311.1 -D 100 --new -l 25 -f 466.2 -D 100 --new -l 700 -f 392 -D 100 --new -l 350 -f 587.32 -D 100 --new -l 350 -f 587.32 -D 100 --new -l 350 -f 587.32 -D 100 --new -l 250 -f 622.26 -D 100 --new -l 25 -f 466.2 -D 100 --new -l 350 -f 369.99 -D 100 --new -l 250 -f 311.1 -D 100 --new -l 25 -f 466.2 -D 100 --new -l 700 -f 392 -D 100 --new -l 350 -f 784 -D 100 --new -l 250 -f 392 -D 100 --new -l 25 -f 392 -D 100 --new -l 350 -f 784 -D 100 --new -l 250 -f 739.98 -D 100 --new -l 25 -f 698.46 -D 100 --new -l 25 -f 659.26 -D 100 --new -l 25 -f 622.26 -D 100 --new -l 50 -f 659.26 -D 400 --new -l 25 -f 415.3 -D 200 --new -l 350 -f 554.36 -D 100 --new -l 250 -f 523.25 -D 100 --new -l 25 -f 493.88 -D 100 --new -l 25 -f 466.16 -D 100 --new -l 25 -f 440 -D 100 --new -l 50 -f 466.16 -D 400 --new -l 25 -f 311.13 -D 200 --new -l 350 -f 369.99 -D 100 --new -l 250 -f 311.13 -D 100 --new -l 25 -f 392 -D 100 --new -l 350 -f 466.16 -D 100 --new -l 250 -f 392 -D 100 --new -l 25 -f 466.16 -D 100 --new -l 700 -f 587.32 -D 100 --new -l 350 -f 784 -D 100 --new -l 250 -f 392 -D 100 --new -l 25 -f 392 -D 100 --new -l 350 -f 784 -D 100 --new -l 250 -f 739.98 -D 100 --new -l 25 -f 698.46 -D 100 --new -l 25 -f 659.26 -D 100 --new -l 25 -f 622.26 -D 100 --new -l 50 -f 659.26 -D 400 --new -l 25 -f 415.3 -D 200 --new -l 350 -f 554.36 -D 100 --new -l 250 -f 523.25 -D 100 --new -l 25 -f 493.88 -D 100 --new -l 25 -f 466.16 -D 100 --new -l 25 -f 440 -D 100 --new -l 50 -f 466.16 -D 400 --new -l 25 -f 311.13 -D 200 --new -l 350 -f 392 -D 100 --new -l 250 -f 311.13 -D 100 --new -l 25 -f 466.16 -D 100 --new -l 300 -f 392.00 -D 150 --new -l 250 -f 311.13 -D 100 --new -l 25 -f 466.16 -D 100 --new -l 700 -f 392