Help With FTP Shell Script

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# 1  
Old 08-08-2011
Help With FTP Shell Script

So i Administer multiple ftp servers that run on dynamic IP's as well as user and password settings are changed by other people constantly. What i need to do is ensure that an FTP is server is up on the IP i check. As well as the login credentials work.

Here is a simple script i wrote. However it freezes depending on whether the ftp server is up. or if the credentials work or not. what i need is some sort of timeout on each connection attempt:

heres what i got so far


for ip in $(cat /root/Desktop/ftp.txt)

ftp -n $HOST <<EOF
user bob bob
echo "$ip"
suggestions please.
# 2  
Old 08-08-2011
1) That is a useless use of cat
2) That is a useless use of backticks as $() are modern equivalents of the backtick. If your input file ever becomes too large for a shell variable to handle, the end of it could be silently ignored.
3) If you're running this code as root, that's dangerous and unnecessary.

This is safer and more efficient:
 while read LINE
done < filename

As for the timeout, that's simple enough:

while read ip
        timeout 300 ftp -n $HOST <<EOF && echo "$ip"
user bob bob
        echo "$ip"
done < /root/Desktop/ftp.txt

The 300 is in seconds. If ftp takes longer than that, it will be killed and 'echo "$ip"' will be skipped. If FTP connects but fails to login, it will return nonzero and echo "$ip" will still be skipped.
# 3  
Old 08-08-2011

Last edited by Noledge; 08-08-2011 at 08:09 PM..
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