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Nick
Nick
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#! /bin/sh

group=""

#utility functions

is_duplicate () {

return grep $1 /etc/passwd /etc/group

}

#script

echo "Welcome to the user management system."
echo "Please enter the name of the group you wish to create:"
read group

while [ is_duplicate "$group" -eq 0 ]
do
echo "That group name already exists."
echo "Please enter a new name:"
read group
done

#! /bin/sh                                                                      
                                                                                
group=""                                                                        
                                                                                
#utility functions                                                              
                                                                                
is_duplicate () {                                                               
                                                                                
  return grep $1 /etc/passwd /etc/group                                         
                                                                                
}                                                                               
                                                                                
#script                                                                         
                                                                                
echo "Welcome to the user management system."                                   
echo "Please enter the name of the group you wish to create:"                   
read group                                                                      
                                                                                
while [ is_duplicate "$group" -eq 0 ]                                           
do                                                                              
  echo "That group name already exists."                                        
  echo "Please enter a new name:"                                               
  read group                                                                    
done

#! /bin/sh

group=""

#utility functions

is_duplicate () {

return grep $1 /etc/passwd /etc/group

}

#script

echo "Welcome to the user management system."
echo "Please enter the name of the group you wish to create:"
read group

while [ is_duplicate "$group" -eq 0 ]
do
echo "That group name already exists."
echo "Please enter a new name:"
read group
done

#! /bin/sh                                                                      
                                                                                
group=""                                                                        
                                                                                
#utility functions                                                              
                                                                                
is_duplicate () {                                                               
                                                                                
  return grep $1 /etc/passwd /etc/group                                         
                                                                                
}                                                                               
                                                                                
#script                                                                         
                                                                                
echo "Welcome to the user management system."                                   
echo "Please enter the name of the group you wish to create:"                   
read group                                                                      
                                                                                
while [ is_duplicate "$group" -eq 0 ]                                           
do                                                                              
  echo "That group name already exists."                                        
  echo "Please enter a new name:"                                               
  read group                                                                    
done
Source Link
Nick
Nick
  • 1
  • 2

bash function call in while loop

I receive an error: "/bin/ums: 19: [: is_duplicate: unexpected operator" when running the following script:

#! /bin/sh

group=""

#utility functions

is_duplicate () {

return grep $1 /etc/passwd /etc/group

}

#script

echo "Welcome to the user management system."
echo "Please enter the name of the group you wish to create:"
read group

while [ is_duplicate "$group" -eq 0 ]
do
echo "That group name already exists."
echo "Please enter a new name:"
read group
done

Why?

Note: The script is a work in progress. In this segment I am trying to grep for the name of a group being input in the console. If the group exists in the group file (i.e. grep returns exit code 0) then continue asking for a name.