stat:查看系统上某个文件的所有状态信息：
[oh@localhost manlist]$ stat ls.md File: `ls.md'Size: 7579 Blocks: 16 IO Block: 4096 regular file
Device: 803h/2051d Inode: 6691574 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 500/ oh) Gid: ( 500/ oh)
Access: 2018-03-15 16:36:50.460265066 +0800
Modify: 2018-03-15 16:36:31.946041769 +0800
Change: 2018-03-15 16:36:31.946041769 +0800
[oh@localhost manlist]$
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查看文件类型：file
[oh@localhost manlist]$ file git.md
git.md: UTF-8 Unicode English text
[oh@localhost manlist]$
killall命令：
#killall http*
杀死所有义http开头的进程
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df查看某个设备还有多少磁盘空间:
[oh@localhost manlist]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 122G 5.8G 110G 5% /
tmpfs 929M 32M 897M 4% /dev/shm
[oh@localhost manlist]$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda3 127658732 5977420 115189920 5% /
tmpfs 950572 32216 918356 4% /dev/shm
[oh@localhost manlist]$
du:某个目录下所有文件或指定文件大小
[oh@localhost manlist]$ du -h ls.md
8.0K ls.md
[oh@localhost manlist]$
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排序数据：sort，按默认语言规则排序。
SORT(1) User Commands SORT(1)NAMEsort - sort lines of text filesSYNOPSISsort [OPTION]... [FILE]...sort [OPTION]... --files0-from=FDESCRIPTIONWrite sorted concatenation of all FILE(s) to standard output.Mandatory arguments to long options are mandatory for short options too. Ordering options:-b, --ignore-leading-blanksignore leading blanks-d, --dictionary-orderconsider only blanks and alphanumeric characters-f, --ignore-casefold lower case to upper case characters-g, --general-numeric-sortcompare according to general numerical value