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Non-integer argument in expr

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# 1  
Old 05-08-2011
Non-integer argument in expr
i wrote this simple shell script

Code:
#!/bin/bash
read  N1
read  N2
expr $N1 + $N2

it work fine in bash and i add it on xinetd for some test but when i try to use in with telnet i got this error :

Code:
ehsan@debian:~$ telnet 192.168.1.4 1234
Trying 192.168.1.4...
Connected to 192.168.1.4.
Escape character is '^]'.
12
23
expr: non-integer argument
Connection closed by foreign host.

please help me to solve this non-integer error
Last edited by niasha; 05-08-2011 at 03:12 AM..
# 2  
Old 05-08-2011
What is N1 and N2 ?

If any of those is IP address, then it won't work of course.
Integer - Wikipedia, the free encyclopedia
# 3  
Old 05-08-2011
How did you execute this? Arguments are 12 and 23 I guess, seems fine.

Try this, its all the same though
Code:
#!/bin/bash 
read  N1; read  N2
((sum=N1+N2))
echo $sum

regards,
Ahamed
# 4  
Old 05-08-2011
Quote:
Originally Posted by ahamed101
How did you execute this? Arguments are 12 and 23 I guess, seems fine.

Try this, its all the same though
Code:
#!/bin/bash 
read  N1; read  N2
((sum=N1+N2))
echo $sum

regards,
Ahamed
thanks but i got this with this script

Code:
ehsan@debian:~$ telnet 192.168.1.4 1234
Trying 192.168.1.4...
Connected to 192.168.1.4.
Escape character is '^]'.
12 
23
")syntax error: invalid arithmetic operator (error token is "

Connection closed by foreign host.

both of this scripts work on my machine fine but when i want to use in on network with telnet they wont work , is there any config for telnet or is telnet change the argument to something else from integer ?
# 5  
Old 05-08-2011
try including this

Code:
#!/bin/bash
typeset -i N1
typeset -i N2
read  N1; read  N2
 ((sum=N1+N2)) 
echo $sum

regards,
Ahamed
# 6  
Old 05-08-2011
Quote:
Originally Posted by ahamed101
try including this

Code:
#!/bin/bash
typeset -i N1
typeset -i N2
read  N1; read  N2
 ((sum=N1+N2)) 
echo $sum

regards,
Ahamed
still doesn't work
Code:
ehsan@debian:~$ telnet 192.168.1.4 1234
Trying 192.168.1.4...
Connected to 192.168.1.4.
Escape character is '^]'.
12
")syntax error: invalid arithmetic operator (error token is "
0
Connection closed by foreign host.

# 7  
Old 05-08-2011
can you tell me how you are executing this? where have you included the arguments? try echo-ing N1 and N2 and see they have the desired values.

regards,
Ahamed
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