Linux系统中添加删除分区命令是什么

小编给大家分享一下Linux系统中添加删除分区命令是什么，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

在Linux系统中如果要添加删除分区可以使用fdisk命令，执行命令之后系统会有提示，只需要根据系统提示一步一步的操作。

fdisk命令：

增加一个分区

1. fdisk -l 查看系统上的分区信息

 [root@fei ~]# fdisk -l  Disk /dev/sda: 21.5 GB, 21474836480 bytes   //总计21.5G 255 heads, 63 sectors/track, 2610 cylinders   // 255个磁面，63个扇区，2610个磁柱 Units = cylinders of 16065 * 512 = 8225280 bytes   //每个磁柱容量 Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005936c     Device Boot      Start         End      Blocks   Id  System /dev/sda1   *           1          26      204800   83  Linux Partition 1 does not end on cylinder boundary. /dev/sda2              26        1332    10485760   83  Linux /dev/sda3            1332        1593     2097152   82  Linux swap / Solaris 1234567891011121314

1. fdisk /dev/sda： 对/dev/sda/进行分区 磁盘分区表示： hda1 hda2 hdb1 hdb2…… sda1 sda2 sdb1 sdb2…… hd大多为IDE硬盘 ， sd大多为SCSI或移动存储

 [root@fei ~]# fdisk /dev/sda  WARNING: DOS-compatible mode is deprecated. It's strongly recommended to          switch off the mode (command 'c') and change display units to          sectors (command 'u').  Command (m for help): 1234567 注释 ：//Command (m for help):  查看帮助信息：输入m，看到如下信息  Command action         # 输出帮助信息    a   toggle a bootable flag  #设置启动信息    b   edit bsd disklabel             # 编 辑分区标签    c   toggle the dos compatibility flag    d   delete a partition                  # 这是删除一个分区的动作    l   list known partition types      # l是列出分区类型，以供我们设置相应分区的类型    m   print this menu                   # m 是列出帮助信息；    n   add a new partition                 #  添加一个分区；    o   create a new empty DOS partition table           #  创建一个新的DOS分区表    p   print the partition table                   #  p列出分区表；    q   quit without saving changes                #不保存退出；    s   create a new empty Sun disklabel        t   change a partition's system id            #t 改变分区类型 id    u   change display/entry units  改变现实单位    v   verify the partition table    w   write table to disk and exit               # 把分区表写入硬盘并退出    x   extra functionality (experts only)       #扩展应用，专家功能 123456789101112131415161718192021 - 选择n 来添加一个分区  Command (m for help): n Command action    e   extended                             #e,扩展分区    p   primary partition (1-4)       #p，主分区1-4 p Selected partition 4           #因为sda1-3已分，所有默认sda4 First cylinder (1593-2610, default 1593):   #磁柱开始位置，采用默认，直接回车 Using default value 1593                              #磁柱开始位置 Last cylinder, +cylinders or +size{K,M,G} (1593-2610, default 2610): +100M  #磁柱解释位置，设置磁盘分区大小   Command (m for help): p             #查看一下当前磁盘信息  Disk /dev/sda: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005936c     Device Boot      Start         End      Blocks   Id  System /dev/sda1   *           1          26      204800   83  Linux Partition 1 does not end on cylinder boundary. /dev/sda2              26        1332    10485760   83  Linux /dev/sda3            1332        1593     2097152   82  Linux swap / Solaris /dev/sda4            1593        1606      111459   83  Linux               //添加成功，sda4  Command (m for help): wq                                                //保存退出 The partition table has been altered!  Calling ioctl() to re-read partition table.  WARNING: Re-reading the partition table failed with error 16: 设备或资源忙. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks. 1234567891011121314151617181920212223242526272829303132333435363738

1. partprobe 或者 partx -a /dev/sda 分区之后，让内核更新分区信息，否则系统需要restart后，内核才能识别新的分区

2. mkfs.ext4 /dev/sda4 创建ext4文件系统，格式化.

 [root@fei ~]# mkfs.ext4 /dev/sda4 mke2fs 1.41.12 (17-May-2010) 文件系统标签= 操作系统:Linux 块大小=1024 (log=0) 分块大小=1024 (log=0) Stride=0 blocks, Stripe width=0 blocks 3776 inodes, 15068 blocks 753 blocks (5.00%) reserved for the super user 第一个数据块=1 Maximum filesystem blocks=15466496 2 block groups 8192 blocks per group, 8192 fragments per group 1888 inodes per group Superblock backups stored on blocks:         8193  正在写入inode表: 完成 Creating journal (1024 blocks): 完成 Writing superblocks and filesystem accounting information: 完成  This filesystem will be automatically checked every 38 mounts or 180 days, whichever comes first.  Use tune2fs -c or -i to override. 1234567891011121314151617181920212223

1. 将/dev/sda4 挂载

 [root@fei ~]# mount /dev/sda4 /mnt [root@fei ~]# df-h -bash: df-h: command not found [root@fei ~]# df -h Filesystem      Size  Used Avail Use% Mounted on /dev/sda2       9.8G  1.4G  8.0G  15% / tmpfs           931M     0  931M   0% /dev/shm /dev/sda1       190M   35M  145M  20% /boot /dev/sr0        3.7G  3.7G     0 100% /media /dev/sda4        14M  130K   13M   2% /mnt     //已将/dev/sda4挂载 12345678910

删除一个分区

 [root@fei ~]# fdisk /dev/sda  WARNING: DOS-compatible mode is deprecated. It's strongly recommended to          switch off the mode (command 'c') and change display units to          sectors (command 'u').  Command (m for help): d                 //删除一个分区 Partition number (1-4): 4                 //选择删除一个分区，如果删除了扩展分区，扩展分区之下的逻辑分区都会删除  Command (m for help): p  Disk /dev/sda: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005936c     Device Boot      Start         End      Blocks   Id  System /dev/sda1   *           1          26      204800   83  Linux Partition 1 does not end on cylinder boundary. /dev/sda2              26        1332    10485760   83  Linux /dev/sda3            1332        1593     2097152   82  Linux swap / Solaris //sda4已经被删除 Command (m for help): wq    //若之前有错误操作，只有不输入w只输入q退出即可

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