ulimit命令

参数说明：

-a   All current limits are reported
-b   The maximum socket buffer size
-c   The maximum size of core files created
-d   The maximum size of a process's data segment
-e   The maximum scheduling priority ( "nice" )
-f   The maximum size of files written by the shell and its children
-i   The maximum number of pending signals
-l   The maximum size that may be locked into memory
-m   The maximum resident set size (many systems do not honor this limit)
-n   The maximum number of open file descriptors (most systems do not allow this value to be set )
-p   The pipe size in 512 byte blocks (this may not be set )
-q   The maximum number of bytes in POSIX message queues
-r   The maximum real-time scheduling priority
-s   The maximum stack size
-t   The maximum amount of cpu time in seconds
-u   The maximum number of processes available to a single user
-v   The maximum amount of virtual memory available to the shell
-x   The maximum number of file locks
-T   The maximum number of threads

显示全部信息：

ulimit -a

返回的属性值说明：

core file size        //限制内核文件的大小限制
data seg size         //最大数据大小限制
scheduling priority   //调度优先级
file size             //最大文件大小限制
pending signals       //信号可以被挂起的最大数，这个值针对所有用户,表示可以被挂起/阻塞的最大信号数量
max locked memory     //内存锁定值的限制
max memory size       //最大可以使用内存限制
open files            //进程打开文件数的限制
pipe size             //管道文件大小限制
POSIX message queues  //可以创建使用POSIX消息队列的最大值，单位为bytes
real-time priority    //限制程序实时优先级的范围,只针对普通用户
stack size            //限制进程使用堆栈段的大小
cpu time              //程序占用CPU的时间,单位是秒
max user processes    //限制程序可以fork的进程数，只对普通用户有效
virtual memory        //限制进程使用虚拟内存的大小
file locks            //锁定文件大小限制