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echo "Subject: test" | /usr/lib/sendmail -v xinhaozheng@gmail.com
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WARNING: local host name (server) is not qualified; see cf/README: WHO AM I?
xinhaozheng@gmail.com... Connecting to [127.0.0.1] via relay...
xinhaozheng@gmail.com... Deferred: Connection timed out with [127.0.0.1]
»³ÒÉÊÇISP·âµôÁË25¶Ë¿Ú¡£¼ì²éһϷÀ»ðǽ£¬ÔÝʱ¹Øµôiptables£¬ÔÙÓÃÕâ¸öÃüÁî²âÊÔ£¬¿ÉÒÔͨ¹ý£º
WARNING: local host name (server) is not qualified; see cf/README: WHO AM I?
xinhaozheng@gmail.com... Connecting to [127.0.0.1] via relay...
220 server ESMTP Sendmail 8.13.8/8.13.8; Thu, 29 Apr 2010 03:22:42 +0200
>>> EHLO server
250-server Hello localhost.localdomain [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
>>> MAIL from:<root@server> SIZE=14
250 2.1.0 <root@server>... Sender ok
>>> RCPT To:<xinhaozheng@gmail.com>
>>> DATA
250 2.1.5 <xinhaozheng@gmail.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 o3T1Mg5Z016990 Message accepted for delivery
xinhaozheng@gmail.com... Sent (o3T1Mg5Z016990 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 server closing connection


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ls  ÏÔʾÎļþÃû(list)
cat  ÏÔʾÎı¾ÎļþÄÚÈÝ
rm [-i]  ɾ³ýÎļþ(remove),-i´ò¿ªÑ¡Ïî
less/more  ·ÖÆÁÏÔʾÎļþ
hostname  ÏÔʾϵͳÃû
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cp SOURCEFILE DESTINATIONFILE  ¸´ÖÆÎļþcopy
mv OLDNAME NEWNAME  ¸ü¸ÄÎļþÃû(move)
lpr [-p] FILEN ......

linuxÏÂffmpeg ÊÖ»úÊÓƵת»»×ܽá

ffmpeg°æ±¾:0.5.1 flv -> mp4  ->3gp
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./ffmpeg -i ÊÓƵÎļþ -y -ss ½Øͼʱ¼ä -vframes 1 -f image2 -s 128x96 Ä¿±êÎļþÃû;
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./ffmpeg -i out.3gp -ss 00:00:00 -t 00:00:10 -s qcif -acodec copy -vcodec copy -y preview.3gp
#ת»»16:9 flvÊÓƵµ½ 4:3µÄmp4ÊÓƵ
ffmpeg -i src. ......

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secureCRTÁ¬½ÓLinux³ö´í

ÓÃsecureCRTÁ¬½ÓLinuxʱ³öÏÖÈçÏ´íÎó£ºThe remote system refused the connection.
1¡¢²éѯsshd¹¤×÷״̬
#service sshd status
ÏÔʾstop
2¡¢ÔËÐÐ#service sshd restart
ÏÔʾPermissions 0777 for '/etc/ssh/ssh_host_rsa_key' are too openµÈһЩȨÏÞ´íÎó
3¡¢ÐÞ¸Ä/etc/sshϵÄÃÜԿȨÏÞ
#chmod 600 sshd_config
#chm ......
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