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今天在研究Linux下增量备份的时候，发现了一个非常Genius的命令。

用这个命令即可以做到增量备份，又可以最少量的占用硬盘空间。

 

rm -rf backup.3
mv backup.2 backup.3
mv backup.1 backup.2
cp -al backup.0 backup.1
rsync -a --delete source_directory/ backup.0/

 

多的懒得写了，大家自己体会吧。:D

 

Refer：http://www.admin-magazine.com/Articles/Using-rsync-for-Backups/

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最近因转换视频格式需要，研究了一下目前的视频格式转换工具。
发现下面几个比较顺手的：

    1. Adobe Media Encoder
      很强大的视频转换工具，支持显卡加速，只是需要$$$
    2. Any Video Converter Free
      转换手机视频的利器，转出来的视频格式比Handbrake要小。当然画质就稍微差点，720P的电影，一部转下来大概有1GB大小。免费
    3. Handbrake
      老牌的免费视频转换工具，支持H265。转出来的画质不错。

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Here are steps to setup a user and allow the user access only via FTP (i.e. no SSH) and also limit access to a specific (user home) directory on proftpd:

1. Add new user: adduser newusername
2. Set password: passwd newusername
3. Modify user home directory from default to a new folder:

usermod -d /target/directory username

4. Edit shells file: vi /etc/shells and add /dev/null at the end
5. Modify newusername entry in the passwd file: vi /etc/passwd to add /./ before the newusername so that the entry looks like this:

newusername:x:502:502::/home/ftp/./newusernamehomedirectory/:/dev/null

6. Edit /etc/proftpd/proftpd.conf file and uncomment the line DefaultRoot ~

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grep -rnw '/path/to/somewhere/' -e 'pattern'
  • -r or -R is recursive,
  • -n is line number, and
  • -w stands for match the whole word.
  • -l (lower-case L) can be added to just give the file name of matching files.

Along with these, --exclude, --include, --exclude-dir flags could be used for efficient searching:

  • This will only search through those files which have .c or .h extensions: 
    grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"
  • This will exclude searching all the files ending with .o extension: 
    grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"
  • For directories, it’s possible to exclude a particular directory(ies) through --exclude-dirparameter. For example, this will exclude the dirs dir1/, dir2/ and all of them matching *.dst/: 
    grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"

This works very well for me, to achieve almost the same purpose like yours.

For more options check man grep

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用了三年多了DigitalOcean，最近发现Vultr的性价比更高，速度更快。

还犹豫什么？换！

目前感觉速度还不错~ 有海外虚拟机需求的朋友可以关注了。