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# 1  
Old 12-17-2012
About reture with string and keep other "echo" info
I use below code to get ip, and I want to echo something in the function, but the $IP will be all the value from "echo" I just want to get the real ip, and keep the echo info, any help

Code:
#!/bin/bash
get_ip()
{
    ip=$(grep -B2 "00:01:02:03:04:05" ip_tmp.log |head -1 |awk '{print $2}')
    echo "............."
    echo "Guest OS ip is $ip" 
    echo "............."
     #rm ip_tmp.log
    echo $ip
}
IP=$(get_ip)
echo "IP is $IP"

Last edited by yanglei_fage; 12-17-2012 at 08:56 AM..
# 2  
Old 12-17-2012
If the (lowercase) variable ip is set, you could just echo that.
# 3  
Old 12-17-2012
Quote:
Originally Posted by Scott
If the (lowercase) variable ip is set, you could just echo that.
I may cause some misunderstanding I updated my question ip()--> get_ip()
# 4  
Old 12-17-2012
That was clear, but doesn't change anything.

The variable ip which is set in the function is available after the function is called. You can use that to echo the IP address, without affecting anything else.

If you really want to use the value of $IP and keep the other stuff, send the other stuff to standard error.

Code:
#!/bin/bash
get_ip()
{
    ip=$(grep -B2 "00:01:02:03:04:05" ip_tmp.log |head -1 |awk '{print $2}')
    echo "............." >&2
    echo "Guest OS ip is $ip" >&2
    echo "............." >&2
     #rm ip_tmp.log
    echo $ip
}
IP=$(get_ip)
echo "IP is $IP"

# 5  
Old 12-17-2012
Quote:
Originally Posted by Scott
That was clear, but doesn't change anything.

The variable ip which is set in the function is available after the function is called. You can use that to echo the IP address, without affecting anything else.

If you really want to use the value of $IP and keep the other stuff, send the other stuff to standard error.

Code:
#!/bin/bash
get_ip()
{
    ip=$(grep -B2 "00:01:02:03:04:05" ip_tmp.log |head -1 |awk '{print $2}')
    echo "............." >&2
    echo "Guest OS ip is $ip" >&2
    echo "............." >&2
     #rm ip_tmp.log
    echo $ip
}
IP=$(get_ip)
echo "IP is $IP"


Thanks it works

Lei
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