Following 2019.8.1
four. Linux common commands
Extended:
5. Query Help
Command Category: internal command, external / configuration commands
Internal commands: Run command on the kernel space and kernel space can call a hardware device directly.
Man command (need to rely more command): man command
Man Manual (manual), a total of eight chapters
6. catalog of common commands
The directory structure under Windows:
Formatting operation is the installation file system, but also to disk partitions.
Directory structure of Linux:
Linux can partition; all files in the root directory (the root directory is the most basic foundation, equivalent to the drying of clothes rack); the rest is equivalent to partition hangers. Storage devices must be mounted before use.
(/ Etc / fstab- boot automatically mount) command on disk partitions and mount
df -h to view the disk mount case;
dd- create a virtual disk (must use zero file)
dd if = / dev / zero of = / root / image bs = 1024k count = 100 create a loop device (i.e., virtual disk);
fdisk (disk file) do disk partition:
sd -scsi type of disk (hd-IDE disk type);
a- first disk (bcd ......)
1 through a partition (2,3,4 ...)
Mkfs: Format (create a file system);
Mount: Mount disk;
Umount: disk unloaded
Summary: In Linux, by mounting the storage space associated manner directly or indirectly to the root, form a tree structure.
7.Linux main directory
8. wildcard file
Extended:
Grep命令（三剑客之一）——行过滤（查看文件中的匹配，过滤某一行）
Grep [选项] [匹配的字符] [(要执行的)对象]
-v反选；-i忽略大小写；^$空白行
9.切换目录（cd）
绝对路径：从根开始，写完整
相对路径：相对当前路径而言，所要处理的目录
