Avoid unnecessary syscalls by using absolute paths in shell

Author: askervin

metrics/scaling/k8s_scale_nc.sh

@@ -24,7 +24,7 @@ nc_port=33101
 nc_req_msg=$(head -c $nc_req_msg_len /dev/zero | tr  '\0' 'x')
 nc_percentiles=(0 1 5 25 50 75 95 99 100)
 
-pod_command="[\"nc\", \"-lk\", \"-p\", \"${nc_port}\", \"-e\", \"sh\", \"-c\", \"echo \${EPOCHREALTIME/./}; cat; echo \${EPOCHREALTIME/./}\"]"
+pod_command="[\"nc\", \"-lk\", \"-p\", \"${nc_port}\", \"-e\", \"/bin/sh\", \"-c\", \"/bin/echo \${EPOCHREALTIME/./}; /bin/cat; /bin/echo \${EPOCHREALTIME/./}\"]"
 
 # Set some default metrics env vars
 TEST_ARGS="runtime=${RUNTIME}"