CODEWITHSUNDEEP
bashshell
Gaddenna NK
Gaddenna NK

Reputation: 739

Inside the while loop i am not able to print a string

I am new to the Scripting

#!/bin/bash
#set -x
cat /proc/net/dev > net
while read -r line
do
    tx_bytes=$(echo $line | tac | head -n1 | awk '{print $2}')
    echo $tx_bytes  
done <net

I want to store the tx bytes into the tx_byte variable. when i tried the above script its printing all the lines which are there in net file.

net file.

Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
wlp9s0b1: 180051861  145907    0    0    0     0          0         0 13205537   85626    0    0    0     0       0          0
    lo: 4136388   45561    0    0    0     0          0         0  4136388   45561    0    0    0     0       0          0
enp5s0: 11824249235 9325207    0    1    0     0          0         0 364193641 4070320    0    0    0     0       0          0

Upvotes: 0

Views: 181

Answers (1)

Cyrus
Cyrus

Reputation: 88583

Print value from last line:

awk 'END{print $2}' /proc/net/dev

Print value from second column with enp5s0: in first column.

awk '$1=="enp5s0:" {print $2}' /proc/net/dev

Upvotes: 3

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