一个Web开发者的博客
1 2 3 4 5 6 | 100811 18:42:06 InnoDB: Operating system error number 13 in a file operation. InnoDB: The error means mysqld does not have the access rights to InnoDB: the directory. InnoDB: File name ./ibdata1 InnoDB: File operation call: 'open'. InnoDB: Cannot continue operation. |
修改下面文件中得权限列表可解决问题。
1 | /etc/apparmor.d/usr.sbin.mysqld |
1 2 | /web/data/mysql/ r, /web/data/mysql/** rwk, |
ctrl-z 把程序放到后台，再通过 bg %<jobid> 提交命令到后台，最后使用 disown -h %<jobid>。现在就可以退出终端，程序依然还在运行。mid3iconv
由于Ubuntu中的Amarok等播放器只支持UTF8字符，所以在Amarok中常常出现乱码。解决方案如下：
1 | sudo apt-get install python-mutagen |
修改mp3中编码：
到你的music目录去
1 | find . -iname "*.mp" -execdir mid3iconv -e GBK {} \; |
安装完Linux一般都会发现快捷键不好用了。
1、简单方法
切入到文本控制台CTRL+ALT+F1
执行 echo crt_enable > /proc/acpi/ibm/video
切回图形界面就可以使用投影仪了。
注：执行前确认 /proc/acpi/ibm/video 存在
如果不存在请往下看。
2、复杂且有效方法
http://www.thinkwiki.org/wiki/Problem_with_video_output_switching
cpulimit
cpulimit 是一个简单而有用的小程序，通过它你可以限制一个进程的 CPU 占用率。如果善加利用，必将成为系统管理员的得力助手。
cpulimit 的用法也很简单，如上图所示，通过 -e 选项指定需控制的进程名（或 -p 选项指定 pid），-l 选项指定 CPU 的占用百分比即可。这里，我将 Chrome 的 CPU 占用率限制到 25%。
cpulimit 可从其项目主页下载，或通过你所用的 Linux 发行版包管理器安装。
The following shortcuts work when using default (Emacs) key bindings. Vi-bindings can be enabled by running set -o vi.
Tab ⇆ : Autocompletes from the cursor position.
Ctrl+a : moves the cursor at the beginning of the line (equivalent to the key Home).
Ctrl+e : (end) moves the cursor at the line end (equivalent to the key End).
Ctrl+p : (previous) recalls the previous command (equivalent to the key ↑).
Ctrl+n : (next) recalls the next command (equivalent to the key ↓).
Ctrl+r : (research) recalls the last command including the specified character(s). A second Ctrl+r recalls the next anterior command which corresponds to the research
Ctrl+s : Go back to the next more recent command of the research (beware to not execute it from a terminal because this command also launches its XOFF). If you changed that XOFF setting, use Ctrl+q to return.
Ctrl+o : executes the found command from research.
Ctrl+l : clears the screen content (equivalent to the command clear).
Ctrl+u : clears the line content before the cursor and copy it in the clipboard.
Ctrl+k : clears the line content after the cursor and copy it in the clipboard.
Ctrl+w : clears the word before the cursor and copy it in the clipboard.
Ctrl+y : (yank) adds the clipboard content from the cursor position.
Ctrl+d : sends an EOF marker, which (unless disabled by an option) closes the current shell (equivalent to the command exit).
Ctrl+c : sends the signal SIGINT to the current task, which aborts and closes it.
Ctrl+z : sends the signal SIGTSTP to the current task, which suspends it. To return to it later one can enter fg ‘process name’ (foreground).
Ctrl+x Ctrl+x : (because x has a crossing shape) alternates the cursor with its old position.
Ctrl+x Ctrl+e : (editor because it takes the $EDITOR shell variable) edits the current line in vi.
Alt+f : (forward) moves forward the cursor of one word.
Alt+b : (backward) moves backward the cursor of one word.
Alt+Del : cuts the word before the cursor.
Alt+d : cuts the word after the cursor.
Alt+u : capitalizes every character from the cursor’s position to the end of the current word.
Alt+l : lowers the case of every character from the cursor’s position to the end of the current word.
Alt+c : capitalizes the character under the cursor and moves to the end of the word.
Alt+r : cancels the changes and put back the line as it was in the history.
1 | ssh -o TCPKeepAlive fred@oracle1.com |
or add follw to your $HOME/.ssh/config file
1 | ServerAliveInterval 60 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #!/bin/sh DOWN_DIR=/home/fred/example.com/upload/ while read line #c=1 do #c=`expr $c + 1` #echo -e "$line \n" file1=`echo -e $line| awk -F" " '{ print $1 }'` file2=`echo -e $line| awk -F" " '{ print $2 }'` dir1=$DOWN_DIR`echo $file2| awk -F"/" '{ print $1"/"$2 }'` mkdir -p $dir1 wget $file1 -O $DOWN_DIR${file2}.jpg #if [ $c -lt 3 ];then #exit #fi done < "/home/fred/src/db.txt" |
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