BASH SSH Key Scripts for authorized_keys

Replace all instances of "user" with a variable and set to correct username.

Delete a Key from authorized_keys

 #!/bin/bash  
 #/usr/local/bin/delete_key  
   
 echo " "  
 echo " "  
 echo " "  
 echo "current number of keys before deletion: " $(cat /home/user/.ssh/authorized_keys |wc -l)  
 echo " "  
 echo "Backing up keys..."  
 cp -fv /home/user/.ssh/authorized_keys /home/user/.ssh/authorized_keys.$(date +%Y.%m.%d)  
 echo " "  
   
 if [ $1 ]; then  
     keytodelete=$1  
     if [ ${#keytodelete} -gt 4 ]; then  
         keys=$(cat /home/user/.ssh/authorized_keys |grep $keytodelete |awk '{print $3}')  
         echo "key(s) will be deleted: " $keys  
         echo " "  
         if [ $2 ]; then  
             if [ $2 == "yes" ]; then  
                 sed -i /$1/d /home/user/.ssh/authorized_keys;  
                 echo "current number of keys after deletion: " $(cat /home/user/.ssh/authorized_keys |wc -l)  
             fi  
         else  
             echo "The above keys will be deleted, if this is what you want run again with 'yes' as your second argument"  
         fi  
     fi  
 else  
     echo "Key you want to delete must be at least 5 chars..."  
     echo "Syntax: delete_key npp56"  
 fi  
   

Backup Keys

 #!/bin/bash  
 #/usr/local/bin/backup_keys  
   
 echo "current number of keys: " $(cat /home/user/.ssh/authorized_keys |wc -l)  
   
 cp -fv /home/user/.ssh/authorized_keys /home/user/.ssh/authorized_keys.$(date +%Y.%m.%d)  

Show Keys

 #!/bin/bash  
 #/usr/local/bin/show_keys  
   
 echo "current number of keys: " $(cat /home/user/.ssh/authorized_keys| wc -l)  
   
 echo " "  
 echo " "  
   
 echo "SSH Keys:"  
 echo " "  
 cat /home/user/.ssh/authorized_keys |awk '{print $3}'  
   
 echo " "  
 echo " "