Playing with awk and variables

[montydepaola]

This is a script that is used to read values from two different files and combine them into a third, thought it would be a piece of cake but it seams my cake is a dirt cake

#!bin/bash
#
# Get Hostname from hostname.txt file
HOST=$(awk 'FNR==1 {printf $1}' /tmp/hostname.txt)
# Get ip address from ipdata.txt
IP=$(awk 'FNR==5 {printf $2}' /tmp/ipdata.txt)
# Create new file with variables
echo "Start File" > /tmp/iphost.txt
echo $HOST >> /tmp/iphost.txt
echo $IP >> /tmp/iphost.txt
echo $HOST $IP >> /tmp/iphost.txt
echo $IP $HOST >> /tmp/iphost.txt
echo "File Done" >> /tmp/iphost.txt

If I do cat /tmp/iphost.txt this is the output
Start File
myhost
192.168.1.15
myhost 192.168.1.15
myhost.1.15
File Done

I have tried many variations to try and get the second to last line to be myhost 192.168.1.15 but have failed at every attempt so any help would be greatly appreciated

[papibe]

Hi montydepaola.

Try quoting your variables:

echo "$IP" "$HOST"

or

echo "$IP $HOST"

Let us know if that helped.
Regards.

EDIT: I would also use regular awk's print instead of printf.

[montydepaola]

Hi montydepaola.

Try quoting your variables:

echo "$IP" "$HOST"

or

echo "$IP $HOST"

Let us know if that helped.
Regards.

papibe
same results as with the first code,
thanks for the quick try

[papibe]

Did you try the other suggestion (print instead of printf)?

Regards.

[montydepaola]

Did you try the other suggestion (print instead of printf)?

Regards.

did that after i tried the different quoting options
also tried to force a third variable at the beginning by adding this...
DIP=ZYXW
echo $DIP $IP $HOST > /tmp/iphost.txt
echo "$DIP $IP $HOST" >> /tmp/iphost.txt
echo $DIP" "$IP" "$HOST" >> /tmp/iphost.txt
none of these work, but a strange thing does happen, the longer the variable DIP is the more numbers I see of IP

[steeldriver]

I suspect your hostname.txt file has some special (non-printing) characters in it - my guess would be Windows line endings (CR-LF) instead of plain newlines

What do you see if you do

cat -net hostname.txt

[montydepaola]

I suspect your hostname.txt file has some special (non-printing) characters in it - my guess would be Windows line endings (CR-LF) instead of plain newlines

What do you see if you do

cat -net hostname.txt

it shows
1 tower$

I created it with nano

[montydepaola]

it shows
1 tower$

I created it with nano

sorry wrong box...
1 myhost$

[papibe]

Could you do the same with ipdata.txt?

cat -net /tmp/ipdata.txt

Another idea to tell if there's special characters would be to add 'od' to translate them:

#!/bin/bash
# Get Hostname from hostname.txt file
HOST=$(awk 'FNR==1 {printf $1}' /tmp/hostname.txt)

# Get ip address from ipdata.txt
IP=$(awk 'FNR==5 {printf $2}' /tmp/ipdata.txt)

# Create new file with variables
echo "Start File" > /tmp/iphost.txt
echo "$HOST" | od -a  >> /tmp/iphost.txt
echo "$IP"   | od -a  >> /tmp/iphost.txt
echo "File Done" >> /tmp/iphost.txt

Regards.

[Vaphell]

it definitely looks like an issue with \r. It rolls the cursor back to the start of the line after printing the first var, so visually the 2nd one overwrites it.

$ ip=$'192.168.1.15\r'; host=$'myhost\r'
$ echo "$ip $host"
 myhost.1.15

you may add -F"[ \t\r]+" param to awk to include \r in its field separator regex (space+tab by default) so it doesn't get into values
you may remove the \r from the files eg with sed 's/\r//g'
you may strip the \r from variables ${ip//$'\r'/} ${host//$'\r'/}