Linux显示计算次数的结果
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free -c
free：选项需要一个参数 -- c
Usage:
free [options]
Options:
-b, --bytes show output in bytes
-k, --kilo show output in kilobytes
-m, --mega show output in megabytes
-g, --giga show output in gigabytes
--tera show output in terabytes
-h, --human show human-readable output
--si use powers of 1000 not 1024
-l, --lohi show detailed low and high memory statistics
-o, --old use old format (without -/+buffers/cache line)
-t, --total show total for RAM + swap
-s N, --seconds N repeat printing every N seconds
-c N, --count N repeat printing N times, then exit
--help display this help and exit
-V, --version output version information and exit
For more details see free(1).
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free --count
free: option '--count' requires an argument
Usage:
free [options]
Options:
-b, --bytes show output in bytes
-k, --kilo show output in kilobytes
-m, --mega show output in megabytes
-g, --giga show output in gigabytes
--tera show output in terabytes
-h, --human show human-readable output
--si use powers of 1000 not 1024
-l, --lohi show detailed low and high memory statistics
-o, --old use old format (without -/+buffers/cache line)
-t, --total show total for RAM + swap
-s N, --seconds N repeat printing every N seconds
-c N, --count N repeat printing N times, then exit
--help display this help and exit
-V, --version output version information and exit
For more details see free(1).