Linux技術文件

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*用日期做檔案名稱
>touch file`date +%y%m%d`
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*監測封包
tcpdumptcpdump -i eth1 -ns 1500 -w /tmp/dhcp.dump
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*解讀封包
tcpdump -r /tmp/dhcp.dump
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* 做一個批次處理的檔,目地在重建
/home/下的usercat /etc/passwd ｜
awk -F ’:’ ’{printf("mkdir /home/%s \n", $1);}’ > 檔名1
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*增快DNS正查速度(利用DNS forwarder)
修改 /etc/named.conf檔, 其中有個options
{..........的敘述, 在此敘述的大括號中加入以下三行,
forwarders {168.95.192.1;};
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*初始化 Squid 快取squid -f /etc/squid/squid.conf –z
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*mysql 指令登入->mysql -u root -p 新開資料庫
->mysqladmin -u root -p create data_name新開資料庫
->mysqladmin -u root -p drop data_name  
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*系統校時
ntpdate ntp.nasa.gov //校時
clock -w //寫入硬體
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在 CLE 1.0 寫程式,由於bash的bug,會使得output
若不跳到下一行就會消失,請加讓\n
#include
int main()
{ printf("hello world");
改成 printf("hello world\n");
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*反向輸出--tac反向列出系統登入者lasttac
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*/var/log有些記錄檔無法自動更換,使檔案變得太大
=>使用logrotate=>編輯/etc/logrotate.d/syslog,加入此檔名,
例如procmail.log
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Map of the Linux kernel/boot/vmlinuz-*內核Linux kernel
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/etc/aliases郵件別名Mail aliases
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/etc/at.deny被禁止的用戶
User IDs of users forbidden to use the at command
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/etc/auto.master自動
mountConfiguration file for the autofs daemon,
which automatically mounts filesystems
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/etc/auto.miscAutomounter map file
------------------------------------------------------------------------------- /etc/crontab系統日誌System cron file
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/etc/cron.daily/*安全日誌Daily cron jobs
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/etc/cron.hourly/*時誌Hourly cron jobs
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/etc/cron.monthly/*月誌Monthly cron jobs
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/etc/cron.weekly/*周誌Weekly cron jobs
------------------------------------------------------------------------------- /etc/filesystems支持的文件系統格式Supported filesystem types
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/etc/fstab文件系統mountFilesystems mounted or available for mounting
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/etc/group系統組定義System group definitions
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/etc/host.confResolver configuration file
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/etc/hosts域名IPMap of IP numbers to hostnames
------------------------------------------------------------------------------- /etc/hosts.allow允許的IPALL : 1.1.1.1　ALL : 2.2.2.* :
denysendmail : 3.3.3.3 : denyipop3d: *sendmail : ALL : allowin.ftpd :
*Hosts allowed to access Internet services
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/etc/hosts.deny禁止的IPALL:*Hosts forbidden to access Internet services
------------------------------------------------------------------------------- /etc/httpd/conf/*Apache配置文件Apache configuration files
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/etc/httpd/httpd.confWeb伺服器配置文件Web server configuration file
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/etc/initlog.conf登陸配置文件Logging configuration file
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/etc/inittabConfiguration for the init daemon, which controls executing processes
------------------------------------------------------------------------------- /etc/issueLinux kernel and distribution version
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查詢設定檔有無用#
Mark起來sed 's/#.*$//' xxx.conf grep -v '^$'
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查看snmpd的運作snmpwalk localhost -c public -v 1
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打開RHEL 3.0的MRTG,從外部可以瀏覽
/etc/httpd/conf.d/mrtg.conf Order deny,allow Deny from all
# Allow from localhost Allow from all -------------------------------------------------------------------------------
RHEL 3.0的postfix使用sasl=>
需將/usr/lib/sasl2/smtpd.conf copy到/usr/lib/sasl
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將man的結果輸出成文字檔=>
man foo col -b >text
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解壓多個zip壓縮檔
==>ls -al *.zipxargs -n 1 unzip