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(access time)不可被修改(modified), 可以有效预防例如手提电脑磁盘I/O错误的发生。 S：硬盘I/O同步选项，功能类似sync。 a：即append，设定该参数后，只能向文件中添加数据，而不能删除，多用于服务器日志文件安全，只有root才能设定这个属性。 c：即compresse，设定文件是否经压缩后再存储。读取时需要经过自动解压操作。 d：即no dump，设定文件不能成为dump程序的备份目标。 i：设定文件不能被删除、改名、设定链接关系，同时不能写入或新增内容。i参数对于文件 系统的安全设置有很大帮助。 j：即journal，设定此参数使得当通过mount参数：data=ordered 或者 data=writeback 挂 载的文件系统，文件在写入时会先被记录(在journal中)。如果filesystem被设定参数为 data=journal，则该参数自动失效。 s：保密性地删除文件或目录，即硬盘空间被全部收回。 u：与s相反，当设定为u时，数据内容其实还存在磁盘中，可以用于undeletion。 各参数选项中常用到的是a和i。a选项强制只可添加不可删

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: That is journal, setting this parameter allows when passing the Mount parameter: Data=ordered or Data=writeback mounted file system, the file will be recorded (in journal) when it is written. If the filesystem parameter is set to Data=Journal, the parameter is automatically invalidated. S: Delete files or directories confidentially, that is, the hard disk space is fully recovered. U: In contrast to S, when set to U, the data content actually exists in the disk and can be used for undeletion. A

, multi-log system security settings can be added. While I is a more stringent security setting, only superuser (root) or processes with cap_linux_immutable processing power (identity) can apply this option.Application Examples:1. Use the chattr command to prevent a key file in the system from being modified:# chattr +i/etc/resolv.confAnd then use mv/etc/resolv.conf and other commands to the file, are to get operation not permitted results. Vim will be prompted to

within the thread.9, not close the program, is to close the current code window. Ctrl+w10. How to display the number of lines of codeWindow->preferences->general->editors->text Editors "Show line Numbers" before the Tick11, when the Output window console has output, how to prohibit the popup has the Output window.In particular, when running multiple programs, such as TCP communication, requires two programs running, want to see the output of a progra

). If the filesystem is set to Data=journal, the parameter is automatically invalidated. S: Delete files or directories confidentially, that is, the hard disk space is fully recovered. U: In contrast to S, when set to U, the data content actually exists in the disk and can be used for undeletion. A and I are commonly used in various parameter options. The A option enforces that only non-removable, and more security settings for the logging system can be added. While I is a stricter security s

/mongod nohttpinterface=true replSet=shard1 [[emailprotected]bin]#vi/export/mongodb/conf/arbiter.conf port=27409 dbpath=/export/mongodb/arbiter logpath=/export/mongodb/log/arbiter.log fork=true logappend=true keyFile=/export/mongodb/key/arbiter nohttpinterface=true replSet=shard1 keyfile files include: Mongod,arbiter Create a script that generates keyfile VI create_key.sh 1 2 3) 4 5 cat/dev/urandom|LC_ALL=Ctr-dc"[:alnum:]" |fold-

information, such as password chage-l OMC-E: Change account expiration chage-e "Space" OMC ==> set permanent chage-e "2017/08/11" OMC==GT;USERADD-E "2017 /08/11 "Omc==>usermod-e" 2017/08/11 "omcchage-m7-m60-w10-i30 OMC-->m (min) m (max) W (warning)-I (inactive) ==> Passwd-n 7-x 60-i 30-w FTL--N (min)-X (max)-W (warning)-I (inactive) chmod: Change the chmod 755-r of property values/system default critical 77 7-022/777-002chmod 644/system default criti

so that when the file system is mounted via the Mount parameter: data=ordered or Data=writeback, the file is recorded (in journal) when it is written. If the filesystem parameter is set to Data=journal, the parameter is automatically invalidated. S: The file or directory is deleted confidentially, that is, the hard disk space is fully recovered. U: In contrast to S, when set to U, the data content actually exists in the disk and can be used for undeletion. A and I are commonly used in the pa

settings.J: Journal, set this parameter so that when the file system is mounted via the Mount parameter: data=ordered or Data=writeback, the file is recorded (in journal) when it is written. If the filesystem parameter is set to Data=journal, the parameter is automatically invalidated.S: Delete files or directories confidentially, that is, the hard disk space is fully recovered.U: In contrast to S, when set to U, the data content actually exists in the disk and can be used for undeletion.A and

Linux chmod read, write, and execute permission changes to a file or directory: To query permissions for a file or directory: Ls-ld (L)/test/profile Modify user permissions on a file or directory: chmod u+ (-) R (W) (x)/test/profile To modify the permissions of a user group to a file or directory: chmod g+ (-) R (W) (x)/test/profile Modify other user permissions on a file or directory: chmod o+ (-) R (W) (x)/test/profile You can also use the statement: Chmod-r 777/test/p

1, Crontab(1) crontab executed every 10 seconds* * * * * */bin/date >>/tmp/date.txt* * * * * * sleep 10; /bin/date >>/tmp/date.txt(2) can also be expressed in the following waysstring meaning------ -------@reboot Run once, at startup.@yearly Run Once a year, "0 0 1 1 *".@annually (same as @yearly)@monthly Run Once a month, "0 0 1 * *".@weekly Run once a week, "0 0 * * 0".@daily Run once a day, "0 0 * * *".@midnight (same as @daily)@hourly Run Once an hour, "0 * * * * *".2, kick the user offline[

Linux system root users can be forced to kick the other login users, first use the $w command to view the logged in user information, display information as follows:[Email protected] ~]# W10:01:23 up 1:23, 3 users, load average:0.71, 0.58, 0.57USER TTY from [email protected] IDLE jcpu PCPURoot tty2-09:59 1:53 0.01s 0.01s-bashRoot pts/0:0.0 10:01 0.00s 0.03s 0.00s WWangbo pts/2 192.168.0.196 09:42 18:50 0.01s 0.01s-bash[Email protected] ~]#Force kick M

processing power (identity) can apply this option. Application Examples:1. Use the chattr command to prevent a key file in the system from being modified:# chattr +i /etc/resolv.confAnd then use mv/etc/resolv.conf and other commands to the file, are to get operation not permitted results. Vim will be prompted to W10:Warning:Changing a readonly file error when editing it. To modify this file, I will remove the I attribute: chattr-i/etc/resolv.conf#

use code user to test if writableWhen you write a file, it appears--INSERT--W10:Warning:Changing a readonly file hint.In addition to setting up a single user, you can set up user groups, effective permissions (Masks) , such as for user groups : g:[ user group ]:[rwx]Note: The effective permission (mask) is the permission set by the user or group that must exist within the scope of the mask's permission setting to take effectAs the above /test file,

recorded (in journal) when it is written. If the filesystem parameter is set to Data=journal, the parameter is automatically invalidated.S: Delete files or directories confidentially, that is, the hard disk space is fully recovered.U: In contrast to S, when set to U, the data content actually exists in the disk and can be used for undeletion.A and I are commonly used in the various parameter options. The A option enforces that only non-removable, multi-log system security settings can be added.

Requirements Description:1, the current directory has a lot of folders, files, statistics/usr/local/This directory, if it is a folder, to delete/usr/local/F1 W1 F2 W2 W3 W4 F4W1 W2 W10.txtRequirements Analysis:1, first list all the files in the directory, with Os.listdir ()2, determine if it is a file, Os.path.isfile ()ImportOsf_dir=OS.GETCWD ()#Get current directoryL_dir=os.path.join (F_dir,'usr\local')#stitching into full usr/local pathLis_dir=os.li

Tags: database name IIS Permissions application als Ror href contains installation packageOriginal: LocalDB Installation and connectionDetailed documentation on LOCALDB, including installation, connection, shared connection, etc. https://technet.microsoft.com/zh-cn/hh510202 Objective: LocalDB can be used when the debugger does not have SQL Server installed. This is a simple SQL Server database that is convenient for local testing and eliminates the task of installing SQL Server Environment: VS20

Tags: require DNS service multiple success picture height memory footprint question authentication39 Common Linux system simple face questionsThis article mainly shares 39 common Linux system simple interview questions, including how to see how the current Linux system has several physical CPUs and the number of cores per CPU, how real-time to see how much network card traffic and so on, I hope to help you. 1, how to see the current Linux system has several physical CPUs and the n

Address: http://terrier.org/docs/v3.5/dfr_description.htmlThe divergence from randomness (DFR) paradigm is a generalisation of one of the very first models of information retrieval , Harter ' s 2-poisson indexing-model [1]. The 2-poisson model is based on the hypothesis which the level of treatment of the informative words are witnessed by an Elite set of documents, in which these words occur to a relatively greater extent than in the rest of the documents.On the other hand, there is words, whic