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Concatenate strings

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# 1  
Old 07-23-2014
Concatenate strings
Hi,I'm trying to concatenate @example.com to each line of a file f1.txt. and push it into f2.txt. Here is the code i'm using.
Code:
for i in `cat /home/linux1/xxxxxxx/f1.txt`;
do
echo ${i}@example.com > /home/linux1/xxxxxx/f2.txt;
done

But above code only printing @example.com in f2.txt. what i need is for each line in f1.txt should be concatenated with @example.com.
Desired ouput:
Code:
a@example.com
b@example.com
c@example.com

Requesting help.
Last edited by Don Cragun; 07-23-2014 at 02:42 AM.. Reason: Change multi-line ICODE tags to CODE tags.
# 2  
Old 07-23-2014
You are not appending (>>) the file but overwriting (>) it every time. Possibly your input file contains blank line as last line or the last line contains spaces thats why its causing the variable of last iteration as null.


It is always safe to use while do .. done construct to read the file to deal with spaces and always use double quotes as a safer side.



Code:
while read line
do
 echo "${line}@example.com" >> /home/linux1/xxxxxx/f2.txt
done < /home/linux1/xxxxxxx/f1.txt

This User Gave Thanks to clx For This Post:
sam_bd
# 3  
Old 07-23-2014
hi Clx, thank you for ur response. I'll try with ur suggestion. however, while reading the file f1.txt (which is in column-format) i think i'll need to do line increment within while loop. Is the below code ok??
Code:
while read $i=`cat /home/linux1/xxxxxxx/f1.txt`
do 
echo "${i}@example.com" >> /home/linux1/xxxxxx/f2.txt
$i=$i+1
done

Last edited by Don Cragun; 07-23-2014 at 04:30 AM.. Reason: Change multi-line ICODE tags to CODE tags.
# 4  
Old 07-23-2014
You need to use while loop exactly as I have shown. The i variable is equal to line variable in my code. This contains each line of the file.

If you are still confused,

Code:
while read i
do
 echo "${i}@example.com" >> /home/linux1/xxxxxx/f2.txt
done < /home/linux1/xxxxxxx/f1.txt

Does that make sense?
Last edited by clx; 07-23-2014 at 04:59 AM..
# 5  
Old 07-23-2014
Hi CLX, i tried with above code and got the error message +1: command not foundDB1 whr DB1 is the content in f1.txt. actully it should have shown like this DB1@example.com
# 6  
Old 07-23-2014
Can you post the updated script?
# 7  
Old 07-24-2014
Hi CLX, here is the script.
Code:
#!/bin/sh
cd /home/linux1/xxxxxxx
while read i
do
echo "${i}@example.com >> /home/linux1/xxxxxxx/f2.txt
done < /home/linux1/xxxxxxx/f1.txt
exit 0

the previous error was due to $i=$i+1. But i've removed it.
However i'm not getting the result in f2.txt. all the lines in f2.txt are filled by @example.com
instead of something like DB1@example.com
Last edited by rbatte1; 07-24-2014 at 09:40 AM.. Reason: Changed main block in ICODE tags to just CODE tags and remived e-mail tag.
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