'\\r': command not found [duplicate]

问题:

This question already has an answer here:

• '\r': command not found - .bashrc / .bash_profile 19 answers

echo "Select your option:"
echo "1. Change ip address"
echo "2. Add route"
echo "3. Reboot"
echo "4. Exit"
read A
case $A in
    1)
            echo "Add Ip address"
            read IP
            echo "Add Netmask"
            read Netid
            echo "Add name of interface"
            read Interface
            ifconfig ${Interface} ${IP}/${Netid}
            if [ $? -ne 0 ];then
                    echo "Ip address not configured"
            fi
            ;;
    2)
            echo "Add Destination"
            read dst
            echo "Add Netmask"
            read Netid
            echo "Add Gateway"
            read gw
            route add $dst mask $Netid gw $gw
            if [ $? -ne 0 ];then
                    echo "Route not added"
            fi
            ;;
    3)
            reboot
            ;;
    4)
            echo "Bye"
            exit 0
            ;;
    default)
            echo "Wrong selection"
            exit 1
esac

Error:

[b104@b104 Downloads]$ ./NetworkUtility.sh 
./NetworkUtility.sh: line 1: $'\r': command not found
Select your option:
1. Change ip address
2. Add route
3. Reboot
4. Exit
1
': not a valid identifier 7: read: `A
./NetworkUtility.sh: line 8: $'\r': command not found
./NetworkUtility.sh: line 9: syntax error near unexpected token `newline'
'/NetworkUtility.sh: line 9: `case $A in 
[b104@b104 Downloads]$ 

回答1:

It seems that you have Windows style line endings (\r\n) - you need to change them to unix style (\n). If you have dos2unix installed you could use it. You could also do it using sed or awk.

回答2:

Its End of Line(EOL) conversion issue when script is written in windows using some editors like notepad, notepad++(tested).

Sed , tr may solve the issue in case of you just need to run script, however if you are developing shell script its become annoying each time first convert using, sed/tr command then run your script.

Notepad++ has an option to convert END OF LINE CONVERSION(EOL). How to do that: go to Edit > EOL Conversion > select Unix/OSX

Here you go, save script file and run it.

Here is screenshot of the same

回答3:

The error happens, because shell doesn't understand DOS/Windows-like line endings and it expects LF instead of CRLF.

You'll need to first configure your editor to use Unix-like line endings or use dos2unix command to change it automatically, e.g.

dos2unix ./NetworkUtility.sh

Read more details at: '\r': command not found.

If you're using Vagrant, check: Windows CRLF to Unix LF Issues in Vagrant