ulimit: command not found 问题解决
执行命令unlimit报错
# unlimit -a
bash: unlimit: command not found因为ulimit不是一个单独的程序。sudo会去找二进制文件运行。由于找不到ulimit的二进制可执行文件，故报错。
可以这样执行命令：
# sh -c "ulimit -a"
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 514527
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 655360
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) unlimited
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited