Shell script if nested for loop script

Introduce through a script shell script Three considerations for writing

The script content

Output the device alarm and clear it

bash-4.3$ cat clear_alarm.sh
#!/bin/bash
j=`/opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications"|grep "remoteNFinstance=fake_smf_nfid"`
i=`/opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications"|grep "remoteNFinstance=ismf-notify"`
if [[ $j ]];then
        for k in `/opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications"| grep -B5 "remoteNFinstance=fake_smf_nfid" | grep fault-id | awk -F " " '{print $2}'`:
        do
                /opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications" >>alarm.log
                /opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management clear-notification fault-id $k" >>alarm.log
        done
elif [[ $i ]];then
        for g in `/opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications"| grep -B5 "remoteNFinstance=ismf-notify" | grep fault-id | awk -F " " '{print $2}'`:
        do
                /opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications" >>alarm.log
                /opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management clear-notification fault-id $g" >>alarm.log
        done
else
        echo `date`" no connetion alarm" >>alarm.txt
fi

Explanation of key points of script

• if Judge

j=`/opt/services/epg/bin/ttx/bin/epg_pdc_run_command "epg node fault-management active-notifications"|grep "remoteNFinstance=fake_smf_nfid"`  // After the command output processing, the negative value is given to the variable 
if [[ $j ]]  //if Judge whether the above command has matching results , If there is a match, the result is ture, Otherwise false

• if Loop nesting Syntax

if [command];then
   for:
      do
      "action command"
      done
elif
   for:
      do
      "action command"      
      done
else
      "action command"
fi
   

• Linux Mixed output of command and character transmission

echo `date`" no connetion alarm"    // Command to put `` in