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

Question

This question already has answers here:
'\r': command not found - .bashrc / .bash_profile [duplicate]
(17 answers)
Closed 5 years ago.
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 $A in
[b104#b104 Downloads]$

Answer 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.

Answer 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

Answer 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