【Linux】Linux下判断磁盘是SSD还是HDD的几种方法

You should get 1 for hard disks and 0 for a SSD.

It will probably not work if your disk is a logical device emulated by hardware (like a RAID controller).

通过判断cat /sys/block/*/queue/rotational的返回值（其中*为你的硬盘设备名称，例如sda等等），如果返回1则表示磁盘可旋转，那么就是HDD了；反之，如果返回0，则表示磁盘不可以旋转，那么就有可能是SSD了。

使用lsblk命令进行判断，参数-d表示显示设备名称，参数-o表示仅显示特定的列。

How to know if a disk is an SSD or an HDD

https://unix.stackexchange.com/questions/65595/how-to-know-if-a-disk-is-an-ssd-or-an-hdd

Linux下判断磁盘是SSD还是HDD的几种方法

https://blog.csdn.net/sch0120/article/details/77725658

Linux下如何查看硬盘是固态硬盘SSD还是机械硬盘HDD

https://blog.csdn.net/qq_40586364/article/details/103908967

Which linux filesystem works best with SSD

https://superuser.com/questions/228657/which-linux-filesystem-works-best-with-ssd

linux 里有很多文档可以帮助学习！

比如

GNU bash, version 3.2.33(1)-release (i386-redhat-linux-gnu)

These shell commands are defined internally. Type `help' to see this list.

Type `help name' to find out more about the function `name'.

Use `info bash' to find out more about the shell in general.

Use `man -k' or `info' to find out more about commands not in this list.

A star (*) next to a name means that the command is disabled.

JOB_SPEC [&] (( expression ))

. filename [arguments] :

[ arg... ] [[ expression ]]

alias [-p] [name[=value] ... ] bg [job_spec ...]

bind [-lpvsPVS] [-m keymap] [-f fi break [n]

builtin [shell-builtin [arg ...]] caller [EXPR]

case WORD in [PATTERN [| PATTERN]. cd [-L|-P] [dir]

command [-pVv] command [arg ...] compgen [-abcdefgjksuv] [-o option

complete [-abcdefgjksuv] [-pr] [-o continue [n]

declare [-afFirtx] [-p] [name[=val dirs [-clpv] [+N] [-N]

disown [-h] [-ar] [jobspec ...]echo [-neE] [arg ...]

enable [-pnds] [-a] [-f filename] eval [arg ...]

exec [-cl] [-a name] file [redirec exit [n]

export [-nf] [name[=value] ...] or false

fc [-e ename] [-nlr] [first] [last fg [job_spec]

for NAME [in WORDS ... ] do COMMA for (( exp1exp2exp3 ))do COM

function NAME { COMMANDS } or NA getopts optstring name [arg]

hash [-lr] [-p pathname] [-dt] [na help [-s] [pattern ...]

history [-c] [-d offset] [n] or hi if COMMANDSthen COMMANDS[ elif

jobs [-lnprs] [jobspec ...] or job kill [-s sigspec | -n signum | -si

let arg [arg ...] local name[=value] ...

logout popd [+N | -N] [-n]

printf [-v var] format [arguments] pushd [dir | +N | -N] [-n]

pwd [-LP] read [-ers] [-u fd] [-t timeout] [

readonly [-af] [name[=value] ...] return [n]

select NAME [in WORDS ... ] do CO set [--abefhkmnptuvxBCHP] [-o opti

shift [n] shopt [-pqsu] [-o long-option] opt

source filename [arguments]suspend [-f]

test [expr]time [-p] PIPELINE

times trap [-lp] [arg signal_spec ...]

true type [-afptP] name [name ...]

typeset [-afFirtx] [-p] name[=valu ulimit [-SHacdfilmnpqstuvx] [limit

umask [-p] [-S] [mode] unalias [-a] name [name ...]

unset [-f] [-v] [name ...] until COMMANDSdo COMMANDSdone

variables - Some variable names an wait [n]

while COMMANDSdo COMMANDSdone { COMMANDS }

good luck

write 函数的第一个参数是 open 函数返回的文件描述符，和windows里一般文件的句柄是对应的，

这段代码中之所以这么用，是因为该程序是从控制台shell启动的，是shell的子进程，他继承了shell默认打开了文件描述符0 1 2 。

0 1 2 分别对应 标准输入 标准输出 标准出错，（在没有重定向、管道的情况下 对应了键盘 显示器 显示器）。

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