[Feature Request]: check/ck_mem_size: check if current memory size is not less than given value

[aronchanisme]

Is there an existing issue for the feature request?

• I have checked the existing issues.

Feature Description

check if current memory size is not less than given value

usage: 
check/ck_mem_size.sh <mem_integer_and_unit>, where 
<unit>: k|K|m|M|g|G, default: M

example:
check/ck_mem_size.sh 256M

output:
return 0: current memory size >= given
return 1: current memory size < given, or invalid usage

Feature Implementation

Linux: free -x | sed -n '2p' | awk '{print $2}' , where x=k|m|g
Mac: sysctl hw.memsize | awk -F ":" '{print $2}' | sed 's/ //g', where unit is bytes

Additional information

No response