diff --git a/cg_init_machine.sh b/cg_init_machine.sh
index 82100d2..2203117 100644
--- a/cg_init_machine.sh
+++ b/cg_init_machine.sh
@@ -27,7 +27,7 @@ echo "$res" >/home/cg_maintain_user/.ssh/authorized_keys
 chown -R cg_maintain_user:cg_maintain_user /home/cg_maintain_user
 chmod 600 /home/cg_maintain_user/.ssh/authorized_keys
 
-if command -v yum >/dev/null >/dev/null 2>&1
+if command -v yum >/dev/null 2>&1
 then
     sudo yum install -y net-snmp
 else
@@ -38,7 +38,7 @@ sudo cp /etc/snmp/snmpd.conf /etc/snmp/snmpd.bak
 sudo curl -L -o /etc/snmp/snmpd.conf https://git.tobyliu.com/toby/common-tools/raw/branch/main/snmpd.conf
 sudo systemctl restart snmpd
 
-if command -v firewall-cmd >/dev/null >/dev/null 2>&1
+if command -v firewall-cmd >/dev/null 2>&1
 then
     sudo firewall-cmd --zone=public --add-service=snmp --permanent
     sudo firewall-cmd --reload