带有 fdisk 的 Bash 脚本
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Bash script with fdisk
提问by Ele Munjeli
I came across this bash script to expand the fs after making the root volume larger on an ami made with Packer. Can someone please explain the meaning of the fdisk options in the heredoc?
在使用 Packer 制作的 ami 上使根卷变大后，我遇到了这个 bash 脚本来扩展 fs。有人可以解释一下heredoc中fdisk选项的含义吗？
#!/bin/bash
fdisk /dev/xvda <<EEOF
d
n
p
1
1
w
EEOF
exit 0
Thank you!
谢谢！
采纳答案by Charles Duffy
To determine what these mean, look at the built-in help from fdisk. Details may differ based on your implementation; for mine, that looks like this:
要确定这些含义，请查看fdisk. 详细信息可能因您的实施而异；对我来说，看起来像这样：
Command (m for help): m
Help:
DOS (MBR)
a toggle a bootable flag
b edit nested BSD disklabel
c toggle the dos compatibility flag
Generic
d delete a partition
l list known partition types
n add a new partition
p print the partition table
t change a partition type
v verify the partition table
Misc
m print this menu
u change display/entry units
x extra functionality (experts only)
Save & Exit
w write table to disk and exit
q quit without saving changes
Create a new label
g create a new empty GPT partition table
G create a new empty SGI (IRIX) partition table
o create a new empty DOS partition table
s create a new empty Sun partition table
...so:
...所以：
ddeletes a partition (presumably your script was developed for a version offdiskwhere if there's only one partition, there's no prompt over which to delete).ncreates a new partition.pindicates that it's a primary partition being created.1indicates that it should be primary partition #11indicates that it should start at sector #1- the following blank line accepts the default end sector
wwrites changes to disk.
d删除一个分区（大概你的脚本是为一个版本开发的fdisk，如果只有一个分区，没有提示删除哪个）。n创建一个新分区。p表示这是一个正在创建的主分区。1表示它应该是主分区 #11表示它应该从扇区 #1 开始- 下面的空行接受默认的结束扇区
w将更改写入磁盘。
回答by Jose Carlos Ramos Carmenates
Try this and adjust for your conditions:
试试这个并根据您的条件进行调整：
#!/bin/bash
HEREDOC_VAR_1='p q '
echo $HEREDOC_VAR_1
HEREDOC_VAR_2='n q '
echo $HEREDOC_VAR_2
echo "$HEREDOC_VAR_1" | fdisk /dev/xvda
echo "$HEREDOC_VAR_2" | fdisk /dev/xvda
