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Filtering ifconfig output

How exactly do people “crack” Unix/Linux Systems?nmap script needed to output text into csv formatText to yaml conversionUse awk to insert a line after N outputPrint a line in stdout that matches an expression if the output contains another expressionSubset data with awkGrep multiple patterns and print a different number of lines below each of the patterns?Awk field printing within the ternary operatorMakefile cppUtest output reformatPrint specific range of lines between two matches starting with a specific line after the first match

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
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0

Im trying to select the First 3 octets of the IPv4 IP from ifconfig. How would i go about doing this. I just cant figure out how to select from this step

[root@hostname ~]# ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}'

Output:

addr:10.20.1.3

what i ultimately want is 10.20.1 for final output

linux awk sed

share|improve this question

edited Jul 6 '17 at 3:40

heemayl

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asked Jul 5 '17 at 23:48

CasMzCasMz

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This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  BTW, the output of the newer ip addr is easier to parse.
  
  – dirkt
  Jul 12 '17 at 5:13
  

  
  
  
  

add a comment | 

0

Im trying to select the First 3 octets of the IPv4 IP from ifconfig. How would i go about doing this. I just cant figure out how to select from this step

[root@hostname ~]# ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}'

Output:

addr:10.20.1.3

what i ultimately want is 10.20.1 for final output

linux awk sed

share|improve this question

edited Jul 6 '17 at 3:40

heemayl

37.6k33 gold badges8282 silver badges110110 bronze badges

asked Jul 5 '17 at 23:48

CasMzCasMz

611 bronze badge

bumped to the homepage by Community♦ 37 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  BTW, the output of the newer ip addr is easier to parse.
  
  – dirkt
  Jul 12 '17 at 5:13
  

  
  
  
  

add a comment | 

Im trying to select the First 3 octets of the IPv4 IP from ifconfig. How would i go about doing this. I just cant figure out how to select from this step

[root@hostname ~]# ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}'

Output:

addr:10.20.1.3

what i ultimately want is 10.20.1 for final output

linux awk sed

share|improve this question

edited Jul 6 '17 at 3:40

heemayl

37.6k33 gold badges8282 silver badges110110 bronze badges

asked Jul 5 '17 at 23:48

CasMzCasMz

611 bronze badge

[root@hostname ~]# ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}'

addr:10.20.1.3

share|improve this question

edited Jul 6 '17 at 3:40

heemayl

37.6k33 gold badges8282 silver badges110110 bronze badges

asked Jul 5 '17 at 23:48

CasMzCasMz

611 bronze badge

share|improve this question

edited Jul 6 '17 at 3:40

heemayl

37.6k33 gold badges8282 silver badges110110 bronze badges

asked Jul 5 '17 at 23:48

CasMzCasMz

611 bronze badge

edited Jul 6 '17 at 3:40

heemayl

37.6k33 gold badges8282 silver badges110110 bronze badges

edited Jul 6 '17 at 3:40

heemayl

37.6k33 gold badges8282 silver badges110110 bronze badges

asked Jul 5 '17 at 23:48

CasMzCasMz

611 bronze badge

asked Jul 5 '17 at 23:48

CasMzCasMz

611 bronze badge

3 Answers
3

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0

Assuming you are looking for the IP address of eth0, this should do it:

ifconfig | grep -A1 eth0 | grep "inet addr" | sed 's/inet addr://' | awk '{ print $1 }' | sed 's/.[0-9]*$//'

share|improve this answer

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

add a comment | 

0

Using only awk, for all interfaces:

ifconfig | awk '/Link encap/{eth=$1} ; /inet addr/{sub(/addr:/, "", $2) ; sub(/.[0-9]*$/,"",$2) ; addr=$2 ; print eth, addr)'

Results:

eth0 192.168.0

lo 127.0.0

share|improve this answer

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

add a comment | 

0

I wouldn't even bother using sed for the actual address. It's more transparent (and easier to get right) to use cut for this!

Add | sed -e 's/inet_addr://' | cut -d. -f 1-3 to the end of your original command:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}' | sed -e 's/inet_addr://' | cut -d. -f 1-3  

Or just use cut instead of awk:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | cut -w -f 2 | sed -e 's/inet_addr://' | cut -d. -f 1-3  

share|improve this answer

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

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add a comment | 

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0

Assuming you are looking for the IP address of eth0, this should do it:

ifconfig | grep -A1 eth0 | grep "inet addr" | sed 's/inet addr://' | awk '{ print $1 }' | sed 's/.[0-9]*$//'

share|improve this answer

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

add a comment | 

0

Assuming you are looking for the IP address of eth0, this should do it:

ifconfig | grep -A1 eth0 | grep "inet addr" | sed 's/inet addr://' | awk '{ print $1 }' | sed 's/.[0-9]*$//'

share|improve this answer

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

add a comment | 

Assuming you are looking for the IP address of eth0, this should do it:

ifconfig | grep -A1 eth0 | grep "inet addr" | sed 's/inet addr://' | awk '{ print $1 }' | sed 's/.[0-9]*$//'

share|improve this answer

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

ifconfig | grep -A1 eth0 | grep "inet addr" | sed 's/inet addr://' | awk '{ print $1 }' | sed 's/.[0-9]*$//'

share|improve this answer

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

answered Jul 6 '17 at 0:08

Timothy MartinTimothy Martin

5,5842525 silver badges3030 bronze badges

0

Using only awk, for all interfaces:

ifconfig | awk '/Link encap/{eth=$1} ; /inet addr/{sub(/addr:/, "", $2) ; sub(/.[0-9]*$/,"",$2) ; addr=$2 ; print eth, addr)'

Results:

eth0 192.168.0

lo 127.0.0

share|improve this answer

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

add a comment | 

0

Using only awk, for all interfaces:

ifconfig | awk '/Link encap/{eth=$1} ; /inet addr/{sub(/addr:/, "", $2) ; sub(/.[0-9]*$/,"",$2) ; addr=$2 ; print eth, addr)'

Results:

eth0 192.168.0

lo 127.0.0

share|improve this answer

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

add a comment | 

Using only awk, for all interfaces:

ifconfig | awk '/Link encap/{eth=$1} ; /inet addr/{sub(/addr:/, "", $2) ; sub(/.[0-9]*$/,"",$2) ; addr=$2 ; print eth, addr)'

Results:

eth0 192.168.0

lo 127.0.0

share|improve this answer

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

ifconfig | awk '/Link encap/{eth=$1} ; /inet addr/{sub(/addr:/, "", $2) ; sub(/.[0-9]*$/,"",$2) ; addr=$2 ; print eth, addr)'

eth0 192.168.0

lo 127.0.0

share|improve this answer

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

answered Jul 6 '17 at 0:53

nxr_jivranxr_jivra

2355 bronze badges

0

I wouldn't even bother using sed for the actual address. It's more transparent (and easier to get right) to use cut for this!

Add | sed -e 's/inet_addr://' | cut -d. -f 1-3 to the end of your original command:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}' | sed -e 's/inet_addr://' | cut -d. -f 1-3  

Or just use cut instead of awk:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | cut -w -f 2 | sed -e 's/inet_addr://' | cut -d. -f 1-3  

share|improve this answer

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

2,11111 gold badge55 silver badges2323 bronze badges

add a comment | 

0

I wouldn't even bother using sed for the actual address. It's more transparent (and easier to get right) to use cut for this!

Add | sed -e 's/inet_addr://' | cut -d. -f 1-3 to the end of your original command:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}' | sed -e 's/inet_addr://' | cut -d. -f 1-3  

Or just use cut instead of awk:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | cut -w -f 2 | sed -e 's/inet_addr://' | cut -d. -f 1-3  

share|improve this answer

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

2,11111 gold badge55 silver badges2323 bronze badges

add a comment | 

I wouldn't even bother using sed for the actual address. It's more transparent (and easier to get right) to use cut for this!

Add | sed -e 's/inet_addr://' | cut -d. -f 1-3 to the end of your original command:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}' | sed -e 's/inet_addr://' | cut -d. -f 1-3  

Or just use cut instead of awk:

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | cut -w -f 2 | sed -e 's/inet_addr://' | cut -d. -f 1-3  

share|improve this answer

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

2,11111 gold badge55 silver badges2323 bronze badges

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | awk '{print $2}' | sed -e 's/inet_addr://' | cut -d. -f 1-3  

ifconfig | grep "inet addr:"  | grep -v "127.0.0.1" | cut -w -f 2 | sed -e 's/inet_addr://' | cut -d. -f 1-3  

share|improve this answer

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

2,11111 gold badge55 silver badges2323 bronze badges

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

2,11111 gold badge55 silver badges2323 bronze badges

answered Jul 11 '17 at 23:17

Bob EagerBob Eager

2,11111 gold badge55 silver badges2323 bronze badges