�ɤ��ˤä��饦�� 2009ǯ3��ܡ�

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2009ǯ3��21��(��)

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_ ˼��Ⱦ��500km��ä��ʵ�Υ�ʤΤǼ��ν��򤷤Ƥä��ɡ��꤭�äƤ��ޤä�:-)��פ��Τۤ��٤��Ȥ��ʤ��ä��Ȥ��Τ��礭��

�� tail -f | grep | grep

_ ��Τؤ��
�ꥢ�륿��ǥ��򸫤��tail��褯�Ȥ��Ȼפ��ޤ��
tail -f /var/log/httpd/access_log
php��ޤߡ�jpg��png��ޤޤʤ��ɽ��
tail -f /var/log/httpd/access_log | fgrep php | fgrep -v jpg | fgrep -v png
��ǰ�Ǥ��Ԥϡ֥ꥢ�륿��פǤϸ��ޤ��
_ ��ϥꥢ�륿��Ǹ��롣
tail -f filename
��Ԥɤ��ꡣ
tail -f filename | grep hoge
�Ǥ⡢��ϥ��ᡣ
tail -f filename | grep hoge | grep fuga
grep 2�Ĥ��ʤΤǡ�3��¤٤Ƥ��äѤ��ᡣ
_ �ʤ��grep ��ɸ��Ϥ��̾��ü��Ǥʤ��å��ơ��ե��ؤΥ��쥯�Ȥ�ѥ��פʤ�н��Ϥ�Хåե��󥰤��뤫�顣��˹礦�Ԥ��ե��ɵ��Ƥ⡢grep ��ǻ��äƤ�Хåե��äѤ��ˤʤ�ޤ�ɸ��Ϥؤν񤭽Ф��Ϥ��ʤ��ʤ��ʤΤǡ��ꥢ�륿��ʽ��ϤˤϤʤ餺��Ф餯��ޤꤷ��Ȱ쵤�˥��äȽ��Ϥ��ơ��ޤ��Ф餯��ޤꡢ�Ȥ��Τ򷫤��֤��Ȥˤʤ롣

_ �狼��䤹��㡣
( echo hoge; sleep 3 ) | grep hoge
�� grep ��ɸ��Ϥ�ü��ʤΤǥХåե��󥰤��줺��hoge ��Ϥ��ơ��θ�3�ä��Ƥ��ץ��ץȤ��֤äƤ��롣
( echo hoge; sleep 3 ) | grep hoge | cat
�� grep ��ɸ��Ϥ��ѥ��פʤΤǥХåե��󥰤��ơ�3�ä��ä��Ϥ򤹤٤��ɤ߹��˥Хåե��˻ĤäƤ�� hoge ��Ϥ��롣
_ ��ʤ��Ȥ� GNU grep �Ϥ��Τ褦��ư��롣��긵�ˤʤ��Τǳ�ǧ�Ǥ��ʤ��ɡ�Solaris �� grep �⤿��ä��Ȼפ��PCRE �Τ��ޤ��ˤĤ��Ƥ�� pcregrep ��ɸ��Ϥ�ü��ξ��Ǥ�Хåե��󥰤��Τǡ�grep ��2�ʤǤϤʤ�1�ʤǤ�ꥢ�륿��ʽ��Ϥ��ʤ��

_ �ġ��櫓�ǡ�tail -f �Τ�� grep ��¿�ʤˤĤʤ��Ƥ�˾��ư��ˤϤʤ��Τǡ��ɡ��Ƥ�ɬ�פʤ��̵��ҤȤĤ��ɽ��ˤޤȤ�� grep ��ȯ�ǺѤޤ��grep �Τ��ˤʤˤ��Υ��ץȸ��Ȥä��ԥե�å��夹�� grep ��Υ��饤�ʡ��񤭤ޤ��礦��

2009ǯ3��23��(��)

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_ ��Ĥ��10ʬ�᤯��Ф��Ȥ��ˤ��äơ��ż֤��äȤ��˿ʤޤ��Ĥ��夬30ʬ�٤��ʡ�

�� v6 DNS

_ ˿�� DNS ��Ф� AAAA �쥳��ɤ�ץ쥼��Ȥ��Ƥߤ��

_ IPv6 �ʤ�Ƥ��äȤ��ڤ��Ƥʤ��ºݤ��Ǥ� AAAA ��äƤ� Web ��ФؤΥ��⤫��ʤ��˶ᤤ�Τǡ�DNS ��⤻��ʬ��1�󥯥��꤬��٤��ʤȤ��Τ��ͽ�ۡ��Ȥ�Ǥ�ͤ�� v4 ��٤��Ϥ뤫�˾��ʤ��ɡ�v6 �Ǥ��ä��ʿ��䤤��碌��롣��ü�桼��ؤ��ڤϤޤ��ޤ��ɡ��зϤǤ��̣��Ϥ��Ƥ�äƤ��ȤʤΤ��

_ �䤤��碌��Ū��¿��Τ� FreeBIT �� DNS ��С��դ˸��С�ISP ��饹�Ǥ� v6 �ȥ�󥹥ݡ��Ȥʥ��å�� DNS ��Ѱդ��Ƥ�Τ� freebit ��餤��ʤ��Ȥ��Ȥǡ��ʤ��äƤ��äѤ� v6 �϶Ͼ��Ǥ�10ʬ�ۤɴ�¬��Ƥ��ǿ�� v6 ��ɥ쥹��˻Ĥ��٤ˤϻȤ��Ƥ��褦��ä�ï��ȻפäƤ� ��::dead:beaf �� v6 ��ɥ쥹�⤷�ä��ȯ��

_ �� Ȥ��ʤ��ۤɤ˥��ɥ쥹�� ipv6 �Ǥ⡢�Ĥ� v4 �ΤȤ��Τ褦�˾��ֹ椫��ͤ�ƥ��ɥ쥹��꿶�äƤ��ޤ��ΤϤɤ��褦��ʤ��ʡ��˳��ϼΤƤƤ⤤��Ϥ��ʤΤˡ�

2009ǯ3��26��(��)

�� Ե��ΰ��ǡ��

_ Unix Programming Frequently Asked Questions ��ܸ�� 1.7 �ץ��ǡ��Ȥ��ư��ˤϤɤ��Ф��Ǥ��?
6. �ե��ǥ��ץ�0��1��2��close()��ޤ��ˤ�äƿƥץ��Ѥ��ɸ��ϡ��ϡ��顼��Ϥ��ޤ��
�ǡ��󤬤��򥵥ܤ�Ȥɤ��ʤ뤫��
_ �Ȥ�� ssh �ǥ�⡼�ȥ��󤷤��Υۥ��ȤǤ��ǡ��ư��Ȥ��˺��롣��䡢��ư�Ϥդġ��ˤǤ��ʤ��ʤ��Ǥ⡢�ǡ��ư�� stdin/out/err ��ü��˷�ӤĤ��ޤޤʤΤǡ��Ȥ��褦�Ȥ��ƥ��λ��⡢��Ϥθ��Ĥ�� ssh ��³��Ǥ��ʤ��ޤޤ��äȻĤ�³��롣��Ƥ��Υǡ��Ϥ��ʸ��ä��Ȥ��Ǥޤä��Ȥ�ʤ��Τǡ��Ȥ�ü��̵��ˤʤ�Ǥޤä��Τ褦�˸��뤳�Ȥˤʤ롣

_ �ġ��櫓�ǡ�mailman ��ȤäƤ�ͤϵ�ư��ץȤ�
/path/to/mailmanctl -s -q start
�ˤʤäƤ�Ȥ��
/path/to/mailmanctl -s -q start <&- >&- 2>&-
�Τ褦��ɸ��Ϥ�ü��ڤ�Υ��֤ǵ�ư��褦�˽񤭴��Ƥ��ޤ��礦��ssh ��ͳ�ǵ�ư��Ǥ��˥��ȤǤ��褦�ˤʤ�ޤ��
_ (3/27 ��) >&- ��ڤ�Υ��ΤϤ��ʤ��ȤΤ��Ȥǡ��ܤ�� ä��򻲾ȡ�

2009ǯ3��27��(��)

�� </dev/null >/dev/null 2>&1

_ ��Τ��η��Ǥ��椤��ޤ��꤬�Ȥ��ޤ��:

��Υǡ��ɸ�२�顼��ϤȤ��˲��񤳤��Ȥ��̵�ط��Υե��˽񤭹��󤸤㤦��Ȥˤʤ뤫�餽��ä��

_ ��ᤷ�Ƥߤ��
#include <stdio.h>
#include <fcntl.h>
main(){
    int fd;
    fd = open("hoge", O_WRONLY, 0);
    printf("fd=%d\n", fd);
}
��ѥ��뤷�Ƽ¹ԡ�
$ ./a.out
fd=-1
��O_CREAT ��ʤ��餫��
$ touch hoge
$ ./a.out
fd=3
stdin/out/err �� 0-2 ��ȤäƤ뤫�顢��μ��3�֤��Ƥ��롢�ȡ�
_ stdout ��Ĥ��Ƽ¹ԡ�
$ ./a.out >&-
stdout ��Ĥ��Ƥ�Τ� printf() �ν��ϤϤɤ��˹Ԥ��Ȼפä��顢
$ cat hoge
fd=1
�ǽ�˥��ץ󤷤��ե��ε��һҤ�1�֤ˤʤäƤơ��ä��˽񤫤�Ƥ��
_ ��ʤ櫓�ǡ�<&- >&- 2>&- �Ǽ¹Ԥ��ȡ��դġ��˥��ץ󤷤��ե��뤬�Ĥ��ȤǶ��ǥ��ץ��˳��Ƥ��Ƥ��ޤ��Τǡ��θ��ɸ��Ϥ�ɸ�२�顼��(�ΤĤ��Υǥ��ץ�)�ˤʤ󤫽񤯤ȡ��̤Υե��˽񤭹��󤸤�äƤ֤ä��路��㤦�衢�ȡ�

_ ��򤱤뤿��ˤϡ��Ĥ��󤸤�ʤ��Ƴ��ޤ� </dev/null >/dev/null 2>&1 �Τ褦�˥��쥯�Ȥ��Ƥ��ȡ� ��Τ��Ѥ��Ȥ��
7. stdin��stdout��stderr�Ѥ˿��ǥ��ץ��򥪡��ץ󤷤ޤ��Ȥ��Ĥ�꤬�ʤ��Ƥ⡢��ץ󤷤Ƥ��Ȥ��ɤ��ͤ��Ǥ��
��ɤ��ͤ��פäƤΤϤ��Ȥ��ä��Τ͡�
_ �ġ��Ȥǡ�mailman ��2��ܤ��ư�Τ��Ϥ��
/path/to/mailmanctl -s -q start </dev/null >/dev/null 2>&1
��Ф��Τϡ��󤳤�ʤ��Ȥ��ʤ��Ƥ⤤��褦�� mailman ��Τ��뤳�ȡ�

2009ǯ3��30��(��)

�� postfix �� TLS

_ ��쥪�줸��ʤ��ۥ��Τ� SSL ��򥤥󥹥ȡ��뤷�� postfix �Υ��С�� MUA �ǤĤʤ��ǤߤƤ⡢openssl s_client �ǤĤʤ��ǤߤƤ��ηٹ�ϽФʤ��ʤ��ȻפäƤ��顢��ʥ��饤��Ȥ��ä��Ĥ�̾�ϡġ� postfix��ʤ�Ǥ��襪��

_ smtp_tls_security_level = may (��꤬ TLS ��б� or ��쥪��Ǥⵤ�ˤ��ʤ�) �� postfix �� STARTTLS ��餻��ȡ��äƤ��ˤĤʤ��Ǥ�Τ��¦�Υ��ˤϤʤ�� Untrusted TLS connection �ȵ�Ͽ��Ƥ��롣��ʤ�ǡ��Ȼ�Ժ��Ĥġ�smtp_tls_security_level = verify (��ڤǤ��ʤ��Ȥ��ˤ��ʤ�) �ȵդˤ�긷��餻�Ƥߤ��鲿��ʤ�� Verified TLS connection �ˤʤ롣�ʤ�ǡ��

_ ��ɤäƤߤ�ȡ�SSL_get_peer_certificate() �ǥ��Ƥ�褦�ʤ��ɡ��ǥ��Ƥ�Τˤʤ�Ǥ��θ�� SSL_get_verify_result() ��̤�Τ�??? �櫓�狼��ͤ��٥��夲�Ƥߤ�ȡ�smtp_tls_security_level = verify �ΤȤ��ϥ��饤��Ȥ� SSL_connect:SSLv3 read server certificate A �ʥ��Ĥ뤬��may �ΤȤ��ϽФʤ��ɤ�Ǥ⡢SSL_get_peer_certificate() ��ʬ�� smtp_tls_security_level ��ˤ�äƵ�ư��Ѥ��褦�ʥ��ɤˤϸ��ʤ��ɤʤ�Ǥ衣��饤��¦��꤬�ɤä��Ǥ⡢��¦�ˤ� SSL_accept:SSLv3 write certificate A �ʥ��ĤäƤ��Ǥ��Ⱦ��򥯥饤��¦��äƤ�Ϥ��ǡ��򽦤��Ƥ��ʤ��饤��Ȥ��Ȼפ��ɡ��ε�ư��ޤä��Ǥ��

_ ��ޤǤε�ư�򸫤Ƥߤ�Ȥɤ��⥵��Ф�̵�¤äݤ��褦�ˤ⸫��ä��Ȥ�Ʊ�� postfix �ʥ��饤��Ȥ��̤Υۥ�� SSL ��äƤ� sendmail �ʥ��Ф� STARTTLS ��Ƥߤ�ȡ��ä��Ϥ�� smtp_tls_security_level = may �Ǥ� Trusted TLS connection �ˤʤä��㤦�Τǡ��饤��Ȥ� 100% ��Ǹ��ʤ��͡��ɤ��??? ��äѤ�狼��󡣤��줫��ơ�

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