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I am writing a script that needs to create a file if an argument is passed to he script. 
If no argument is passed then it will ask for fileName but it needs to have default permission as `-rwx- --- - ---`.
I am using this command `chmod a=-rwx` to remove all the default permissions and then i am using `chmod u=+rwx` to get the desired permission as stated but it is not working.
Can anyone help please?

```
#!bin\bash

if [ $#==0 ]; then
    echo "Please enter a file name?"
    read fileName
    if [ -f $fileName ]; then
        echo "File already exist! Opening for Editing"
        sleep 3
        nano $fileName
    else
        echo "File created with the name $fileName"
        echo "Opening $fileName for editing "
        sleep 3
        echo "#!bin\bash" >$fileName
        nano $fileName
    fi
elif [ -f $1 ]; then
    echo "File already exists with the name $1"
    echo "Opening for editing"
    sleep 3
    nano $1
else
    fileName="$1"
    chmod a=-rwx $fileName
    chmod u=+rwx $fileName
    echo "File created with the name $filename"
    echo "Opening $fileName for editing "
    echo "#!bin\bash" >$fileName
    sleep 3
    nano $1

fi
```

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