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# **sysctl**
## 说明
**sysctl命令** 被用于在内核运行时动态地查看修改内核的运行参数，可用的内核参数在目录`/proc/sys`中。它包含一些TCP/ip堆栈和虚拟内存系统
的高级选项
## 选项
```markdown
-A alias of -a(但以表格方式显示)
-X alias of -a
--deprecated include deprecated parameters to listing
-b, --binary print value without new line
-e, --ignore ignore unknown variables errors
-N, --names print variable names without values
-n, --values print only values of a variables
-p, --load[=< file > ] read values from file
-f alias of -p
--system read values from all system directories
-r, --pattern < expression > select setting that match expression
-q, --quiet do not echo variable set
-w, --write enable writing a value to variable;当改变sysctl设置时使用此项
-o does nothing
-x does nothing
-d alias of -h
```
## 实例
```bash
sysctl -a # 查看所有可读内核变量
sysctl net.nf_conntrack_max # 读取一个指定的变量，
sysctl net.nf_conntrack_max= 262144 # 要设置一个指定的变量，
```
