dvd authoring on mac 18. Oct 2008
Prosumer-DVD-Authoring ist ein nicht existentes Marksegment auf dem Mac. Entweder man benutzt so eine Spielzeug-Software wie Toast oder man bemüht ein Profi-Paket wie DVD Studio Pro mit einem Neupreis von über tausend Euro.
visualhub is dead 16. Oct 2008
Eines meiner Lieblingsprogramme für die Video-Rekodierung wird nicht mehr weiterentwickelt. Das Autor hat vor kurzem die Arbeit aus persönlichen Gründen niedergelegt. Es gibt aber Hoffnung in Form einer Open Source-Veröffentlichung, die zwar schon kompiliert, aber ansonsten leider noch wenig sinnvolles macht.
predefined character classes in grep 06. Jul 2008
Many regex implementations have “macros” for various character classes. In Perl, for example, \d matches any digit ([0-9]) and \w matches any “word character” ([a-zA-Z0-9_]). Grep uses a slightly different notation for the same thing: [:digit:] for digits and [:alnum:] for alphanumeric characters. (BSD)
Finally, certain named classes of characters are predefined within bracket expressions, as follows. Their names are self explanatory, and they are [:alnum:], [:alpha:], [:cntrl:], [:digit:], [:graph:], [:lower:], [:print:], [:punct:], [:space:], [:upper:], and [:xdigit:]. For example, [[:alnum:]] means [0-9A-Za-z]. (grep man page)
Was unter Ruby
line = "length 1450"
puts line if line =~ /\d{4}/
heißt wird also unter der bash mit grep zu
export line="length 1450"
echo $line | egrep [[:digit:]]{4}
was zwar die regulären Ausdrücke unnötig aufbläht, aber immerhin die gleiche Funktionalität zur Verfügung stellt.
beautiful network monitoring 27. Jun 2008
Monitoring networks with tcpdump works fine, but even in quiet mode tcpdump outputs too much information if you’re interested in application layer protocols like HTTP or IMAP. A nice alternative on the command line is ngrep which has a much more readable output. ngrep filters all tcp packets with an empty data part and strips the header of non-empty tcp packets. The only beauty flaw in my eyes is the dot ngrep inserts for every tab and for every carriage return. In my opinion it should offer an option to specify the tabulator size and just ignore the carriage returns.
But see for yourself, here the tcpdump output of an IMAP session,
$ sudo tcpdump -i en1 -A -s 0 -qtn port imap
tcpdump: verbose output suppressed,
use -v or -vv for full protocol decode
listening on en1, link-type EN10MB (Ethernet),
capture size 65535 bytes
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..@..@.@.......P..N.|...7.n........Go.............
/!..........
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 0
E..<..@.9...P..N.......|.....7.o...............
w.A./!......
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4..@.@.......P..N.|...7.o...............
/!..w.A.
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 21
E..I..@.9...P..N.......|.....7.o...........
w.A./!..* OK Dovecot ready.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4.P@.@..j....P..N.|...7.o...............
/!..w.A.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 33
E..U.8@.@..`....P..N.|...7.o...............
/!.2w.A.1 LOGIN foo@bar.net password
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 0
E..4..@.9...P..N.......|.....7.......<.....
w.F'/!.2
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 17
E..E..@.9...P..N.......|.....7......c......
w.F./!.21 OK Logged in.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4.0@.@.......P..N.|...7.....?.....D.....
/!.>w.F.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 14
E..B.#@.@.......P..N.|...7.....?...........
/!.cw.F.1 LIST """%"
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 0
E..4..@.9...P..N.......|...?.7.............
w.H./!.c
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 513
E..5..@.9...P..N.......|...?.7.............
w.H./!.c* LIST (\HasChildren) "." "Trash"
* LIST (\HasNoChildren) "." "Sent"
* LIST (\HasNoChildren) "." "Spam"
* LIST (\HasNoChildren) "." "Sent Messages"
* LIST (\HasNoChildren) "." "Drafts"
* LIST (\HasNoChildren) "." "Spamtraining"
* LIST (\HasNoChildren) "." "Hamtraining"
* LIST (\HasNoChildren) "." "Spamtesting"
* LIST (\HasNoChildren) "." "Hamtesting"
* LIST (\HasNoChildren) "." "Deleted Messages"
* LIST (\HasNoChildren) "." "Spamverdacht"
* LIST (\HasNoChildren) "." "INBOX"
1 OK List completed.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4]'@.@.8.....P..N.|...7.....@...........
/!.cw.H.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 10
E..>.L@.@..c....P..N.|...7.....@.....N.....
/!..w.H.1 LOGOUT
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 19
E..G..@.9...P..N.......|...@.7.............
w.IP/!..* BYE Logging out
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4.I@.@..p....P..N.|...7.....S.....%.....
/!..w.IP
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 24
E..L..@.9...P..N.......|...S.7.............
w.IP/!..1 OK Logout completed.
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4C#@.@.R.....P..N.|...7.....l...........
/!..w.IP
IP 192.168.2.22.50556 > 80.237.145.78.143: tcp 0
E..4.;@.@.......P..N.|...7.....l...........
/!..w.IP
IP 80.237.145.78.143 > 192.168.2.22.50556: tcp 0
E..4..@.9...P..N.......|...l.7.......j.....
w.IQ/!..
20 packets captured
28 packets received by filter
0 packets dropped by kernel
compared with the corresponding ngrep output.
$ sudo ngrep -d en1 -W byline port imap
interface: en1 (192.168.2.0/255.255.255.0)
filter: (ip) and ( port imap )
####
T 80.237.145.78:143 -> 192.168.2.22:50556 [AP]
* OK Dovecot ready..
##
T 192.168.2.22:50556 -> 80.237.145.78:143 [AP]
1 LOGIN foo@bar.net password.
##
T 80.237.145.78:143 -> 192.168.2.22:50556 [AP]
1 OK Logged in..
##
T 192.168.2.22:50556 -> 80.237.145.78:143 [AP]
1 LIST """%".
##
T 80.237.145.78:143 -> 192.168.2.22:50556 [AP]
* LIST (\HasChildren) "." "Trash".
* LIST (\HasNoChildren) "." "Sent".
* LIST (\HasNoChildren) "." "Spam".
* LIST (\HasNoChildren) "." "Sent Messages".
* LIST (\HasNoChildren) "." "Drafts".
* LIST (\HasNoChildren) "." "Spamtraining".
* LIST (\HasNoChildren) "." "Hamtraining".
* LIST (\HasNoChildren) "." "Spamtesting".
* LIST (\HasNoChildren) "." "Hamtesting".
* LIST (\HasNoChildren) "." "Deleted Messages".
* LIST (\HasNoChildren) "." "Spamverdacht".
* LIST (\HasNoChildren) "." "INBOX".
1 OK List completed..
##
T 192.168.2.22:50556 -> 80.237.145.78:143 [AP]
1 LOGOUT.
#
T 80.237.145.78:143 -> 192.168.2.22:50556 [AP]
* BYE Logging out.
##
T 80.237.145.78:143 -> 192.168.2.22:50556 [AFP]
1 OK Logout completed..
28 received, 0 dropped
force unmount on mac os x 27. Jun 2008
When using Mac OS X you might have encountered this message.
The disk "foobar" is in use and could not be ejected.
Try quitting appplications and try again.
This message may occur even if you have all closed all programs. The guilty party for this behavious may be Leopard’s FSEvents, which sometimes has a lock on a volume. To force the unmount of a volume just open a Terminal and use umount.
sudo umount -f /Volumes/FooBar
