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Shell Programming and Scripting

For loop output redirection

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# 1  
Old 03-28-2014
For loop output redirection
Hi All,

i have below for loop of which i am trying to redirect output in a file:
Code:
 
for i in `/usr/sbin/ifconfig -a | awk '/flags/ {print $1}' | grep -v lo | sed 's/://g'`
do
ifconfig $i dhcp status
done >> /tmp/logfile

but instead the output is appearing as stdout on screen rather than a file.
Could you please let me know what mistakes i am doing ..
# 2  
Old 03-28-2014
Code:
ifconfig $i dhcp status >> /tmp/logfile

# 3  
Old 03-28-2014
thanks vbe .. i have tried this before the result is same.Output still apears on the screen but not gettting redirected into the file..
please suggest
# 4  
Old 03-28-2014
Try:
Code:
for i in `/usr/sbin/ifconfig -a | awk '/flags/ && $1 !~ /lo/ {gsub(/:/, "", $1};print $1}'`
do
        /usr/sbin/ifconfig $i dhcp status
done 2>&1 >> /tmp/logfile

# 5  
Old 03-28-2014
Does below command gives any output ?

/usr/sbin/ifconfig -a | awk '/flags/ {print $1}' | grep -v lo | sed 's/://g'



try with this first . whats the content of file /tmp/logfile_1 and /tmp/logfile_2
Code:
for i in `/usr/sbin/ifconfig -a | awk '/flags/ {print $1}' | grep -v lo | sed 's/://g'`
do
echo $i >> /tmp/logfile_1
ifconfig $i  >> /tmp/logfile_2
done

Last edited by Franklin52; 03-28-2014 at 07:21 AM.. Reason: Please use CODE tags, not ICODE tags for code blocks. Thanks.
# 6  
Old 03-28-2014
yes .please find the output of the for loop :
PHP Code:
bash-3.2# cat /tmp/logfile_1
e1000g0
e1000g1
bash-3.2# cat /tmp/logfile_2
e1000g0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 172.16.1.142 netmask ffffffe0 broadcast 172.16.1.159
        ether 0:50:56:ab:2d:2a
e1000g1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
        inet 10.18.154.174 netmask ffffffe0 broadcast 10.18.154.191
        ether 0:50:56:ab:6b:e3 
# 7  
Old 04-01-2014
can someone plz let me know how this output can be reduirected to file.
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