produces error.

on a 12 GB memory produces an error:
./check_snmp_memory.txt -H 172.16.1.100 -C snmp -w 80 -c 90
./check_snmp_memory.txt: line 123: /usr/bin/bc: No such file or directory
./check_snmp_memory.txt: line 123: /usr/bin/bc: No such file or directory
./check_snmp_memory.txt: line 123: /usr/bin/bc: No such file or directory
./check_snmp_memory.txt: line 123: /usr/bin/bc: No such file or directory
Memory usage : Go used for a total of Go (92%), SWAP usage : Go used for a total of Go (45%)| total=12873891840B;10299113472;11586502656;0 used=11957960704B;0;0;0 swap=12575440896B;0;0;0 buffer=0B;0;0;0 cache=0B;0;0;0