Regex awk to Cisco Interface
I would like to know if have some Sed/Grep or Awk regex to parse Cisco interface section, with specific attribute, like bellow.
Content of file.txt
!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
!
Script:
#!/bin/bash
VALUE="no ip proxy-arp"
awk -v RS='!n' -v PATTERN=${VALUE} '/$PATTERN/' file.txt | awk '/^interface/';
exit 0
The problem is when I run line directly from shell, it work, but when I run from script, it don't work.
Running with bash -x, I can see that awk can't replace variable value.
Any suggestions ?
awk regular-expression cisco interface
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
asked Apr 11 '13 at 17:47
Robert
12
add a comment |
I would like to know if have some Sed/Grep or Awk regex to parse Cisco interface section, with specific attribute, like bellow.
Content of file.txt
!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
!
Script:
#!/bin/bash
VALUE="no ip proxy-arp"
awk -v RS='!n' -v PATTERN=${VALUE} '/$PATTERN/' file.txt | awk '/^interface/';
exit 0
The problem is when I run line directly from shell, it work, but when I run from script, it don't work.
Running with bash -x, I can see that awk can't replace variable value.
Any suggestions ?
awk regular-expression cisco interface
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
asked Apr 11 '13 at 17:47
Robert
12
Something likegrep -B1 'no ip proxy-arp' file.txt | head -1? What is the expected output?
– Teresa e Junior
Apr 12 '13 at 3:16
@TeresaeJunior I don't know whether this is necessary but the awk solutions deliver (possibly) more than one line. Thus the second part of the pipeline should be e.g. another grep.
– Hauke Laging
Apr 12 '13 at 4:07
1
FYI, you asked forsed|grep|awkassistance; however, ciscoconfparse is a python module which specializes in handling these kind of tasks. If you do a lot of this, it may be worth your while to consider using a library which is built for parsing cisco configs.
– Mike Pennington
Feb 8 '14 at 19:31
add a comment |
I would like to know if have some Sed/Grep or Awk regex to parse Cisco interface section, with specific attribute, like bellow.
Content of file.txt
!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
!
Script:
#!/bin/bash
VALUE="no ip proxy-arp"
awk -v RS='!n' -v PATTERN=${VALUE} '/$PATTERN/' file.txt | awk '/^interface/';
exit 0
The problem is when I run line directly from shell, it work, but when I run from script, it don't work.
Running with bash -x, I can see that awk can't replace variable value.
Any suggestions ?
awk regular-expression cisco interface
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
asked Apr 11 '13 at 17:47
Robert
12
I would like to know if have some Sed/Grep or Awk regex to parse Cisco interface section, with specific attribute, like bellow.
Content of file.txt
!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
!
Script:
#!/bin/bash
VALUE="no ip proxy-arp"
awk -v RS='!n' -v PATTERN=${VALUE} '/$PATTERN/' file.txt | awk '/^interface/';
exit 0
The problem is when I run line directly from shell, it work, but when I run from script, it don't work.
Running with bash -x, I can see that awk can't replace variable value.
Any suggestions ?
awk regular-expression cisco interface
awk regular-expression cisco interface
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
asked Apr 11 '13 at 17:47
Robert
12
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
asked Apr 11 '13 at 17:47
Robert
12
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
edited Jun 20 '13 at 7:15
Anthon
60.2k17102163
60.2k17102163
asked Apr 11 '13 at 17:47
Robert
12
asked Apr 11 '13 at 17:47
Robert
12
asked Apr 11 '13 at 17:47
Robert
12
12
Something likegrep -B1 'no ip proxy-arp' file.txt | head -1? What is the expected output?
– Teresa e Junior
Apr 12 '13 at 3:16
@TeresaeJunior I don't know whether this is necessary but the awk solutions deliver (possibly) more than one line. Thus the second part of the pipeline should be e.g. another grep.
– Hauke Laging
Apr 12 '13 at 4:07
1
FYI, you asked forsed|grep|awkassistance; however, ciscoconfparse is a python module which specializes in handling these kind of tasks. If you do a lot of this, it may be worth your while to consider using a library which is built for parsing cisco configs.
– Mike Pennington
Feb 8 '14 at 19:31
add a comment |
Something likegrep -B1 'no ip proxy-arp' file.txt | head -1? What is the expected output?
– Teresa e Junior
Apr 12 '13 at 3:16
@TeresaeJunior I don't know whether this is necessary but the awk solutions deliver (possibly) more than one line. Thus the second part of the pipeline should be e.g. another grep.
– Hauke Laging
Apr 12 '13 at 4:07
1
FYI, you asked forsed|grep|awkassistance; however, ciscoconfparse is a python module which specializes in handling these kind of tasks. If you do a lot of this, it may be worth your while to consider using a library which is built for parsing cisco configs.
– Mike Pennington
Feb 8 '14 at 19:31
Something like
grep -B1 'no ip proxy-arp' file.txt | head -1? What is the expected output?– Teresa e Junior
Apr 12 '13 at 3:16
Something like
grep -B1 'no ip proxy-arp' file.txt | head -1? What is the expected output?– Teresa e Junior
Apr 12 '13 at 3:16
@TeresaeJunior I don't know whether this is necessary but the awk solutions deliver (possibly) more than one line. Thus the second part of the pipeline should be e.g. another grep.
– Hauke Laging
Apr 12 '13 at 4:07
@TeresaeJunior I don't know whether this is necessary but the awk solutions deliver (possibly) more than one line. Thus the second part of the pipeline should be e.g. another grep.
– Hauke Laging
Apr 12 '13 at 4:07
1
1
FYI, you asked for
sed|grep|awk assistance; however, ciscoconfparse is a python module which specializes in handling these kind of tasks. If you do a lot of this, it may be worth your while to consider using a library which is built for parsing cisco configs.– Mike Pennington
Feb 8 '14 at 19:31
FYI, you asked for
sed|grep|awk assistance; however, ciscoconfparse is a python module which specializes in handling these kind of tasks. If you do a lot of this, it may be worth your while to consider using a library which is built for parsing cisco configs.– Mike Pennington
Feb 8 '14 at 19:31
add a comment |
2 Answers
2
active
oldest
votes
Hard to believe that this works in your shell. Nonetheless this code contains several errors and also has the wrong approach IMHO.
awk expects a string between // not a variable. These are constant regular expressions. So you either make the shell put the variable there or you use ~.
Your approach with corrections:
awk -v RS='!n' -v PATTERN="${VALUE}" '$0 ~ PATTERN' file.txt |
awk '/^interface/'
I am surprised that this works. From the documentation I had expected that due to the setting of RS an unwanted "!" would be printed. However, I consider this one better:
awk -v PATTERN="${VALUE}"
'$0 ~ PATTERN { print previousline; }; { previousline=$0; }' file.txt
or with hardcoded pattern
awk '/no ip proxy-arp/ { print previousline; }; { previousline=$0; }' file.txt
or with the shell writing the pattern
awk /"$VALUE"/' { print previousline; }; { previousline=$0; }' file.txt
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
+1 forpreviousline. Nice one :)
– Teresa e Junior
Apr 12 '13 at 5:11
add a comment |
echo "!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
" | pcregrep -M "^interface .*0/1n (.*n)!"
result:
interface FastEthernet0/1
no ip unreachables
answered Dec 9 at 1:20
Mac Camel
1
The OP only wants to show interfaces containing the textno ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the!from the end of the input.
– JigglyNaga
Dec 10 at 10:31
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Hard to believe that this works in your shell. Nonetheless this code contains several errors and also has the wrong approach IMHO.
awk expects a string between // not a variable. These are constant regular expressions. So you either make the shell put the variable there or you use ~.
Your approach with corrections:
awk -v RS='!n' -v PATTERN="${VALUE}" '$0 ~ PATTERN' file.txt |
awk '/^interface/'
I am surprised that this works. From the documentation I had expected that due to the setting of RS an unwanted "!" would be printed. However, I consider this one better:
awk -v PATTERN="${VALUE}"
'$0 ~ PATTERN { print previousline; }; { previousline=$0; }' file.txt
or with hardcoded pattern
awk '/no ip proxy-arp/ { print previousline; }; { previousline=$0; }' file.txt
or with the shell writing the pattern
awk /"$VALUE"/' { print previousline; }; { previousline=$0; }' file.txt
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
+1 forpreviousline. Nice one :)
– Teresa e Junior
Apr 12 '13 at 5:11
add a comment |
Hard to believe that this works in your shell. Nonetheless this code contains several errors and also has the wrong approach IMHO.
awk expects a string between // not a variable. These are constant regular expressions. So you either make the shell put the variable there or you use ~.
Your approach with corrections:
awk -v RS='!n' -v PATTERN="${VALUE}" '$0 ~ PATTERN' file.txt |
awk '/^interface/'
I am surprised that this works. From the documentation I had expected that due to the setting of RS an unwanted "!" would be printed. However, I consider this one better:
awk -v PATTERN="${VALUE}"
'$0 ~ PATTERN { print previousline; }; { previousline=$0; }' file.txt
or with hardcoded pattern
awk '/no ip proxy-arp/ { print previousline; }; { previousline=$0; }' file.txt
or with the shell writing the pattern
awk /"$VALUE"/' { print previousline; }; { previousline=$0; }' file.txt
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
+1 forpreviousline. Nice one :)
– Teresa e Junior
Apr 12 '13 at 5:11
add a comment |
Hard to believe that this works in your shell. Nonetheless this code contains several errors and also has the wrong approach IMHO.
awk expects a string between // not a variable. These are constant regular expressions. So you either make the shell put the variable there or you use ~.
Your approach with corrections:
awk -v RS='!n' -v PATTERN="${VALUE}" '$0 ~ PATTERN' file.txt |
awk '/^interface/'
I am surprised that this works. From the documentation I had expected that due to the setting of RS an unwanted "!" would be printed. However, I consider this one better:
awk -v PATTERN="${VALUE}"
'$0 ~ PATTERN { print previousline; }; { previousline=$0; }' file.txt
or with hardcoded pattern
awk '/no ip proxy-arp/ { print previousline; }; { previousline=$0; }' file.txt
or with the shell writing the pattern
awk /"$VALUE"/' { print previousline; }; { previousline=$0; }' file.txt
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
Hard to believe that this works in your shell. Nonetheless this code contains several errors and also has the wrong approach IMHO.
awk expects a string between // not a variable. These are constant regular expressions. So you either make the shell put the variable there or you use ~.
Your approach with corrections:
awk -v RS='!n' -v PATTERN="${VALUE}" '$0 ~ PATTERN' file.txt |
awk '/^interface/'
I am surprised that this works. From the documentation I had expected that due to the setting of RS an unwanted "!" would be printed. However, I consider this one better:
awk -v PATTERN="${VALUE}"
'$0 ~ PATTERN { print previousline; }; { previousline=$0; }' file.txt
or with hardcoded pattern
awk '/no ip proxy-arp/ { print previousline; }; { previousline=$0; }' file.txt
or with the shell writing the pattern
awk /"$VALUE"/' { print previousline; }; { previousline=$0; }' file.txt
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
edited Apr 12 '13 at 18:54
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
answered Apr 12 '13 at 3:57
Hauke Laging
55.6k1285133
55.6k1285133
+1 forpreviousline. Nice one :)
– Teresa e Junior
Apr 12 '13 at 5:11
add a comment |
+1 forpreviousline. Nice one :)
– Teresa e Junior
Apr 12 '13 at 5:11
+1 for
previousline. Nice one :)– Teresa e Junior
Apr 12 '13 at 5:11
+1 for
previousline. Nice one :)– Teresa e Junior
Apr 12 '13 at 5:11
add a comment |
echo "!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
" | pcregrep -M "^interface .*0/1n (.*n)!"
result:
interface FastEthernet0/1
no ip unreachables
answered Dec 9 at 1:20
Mac Camel
1
The OP only wants to show interfaces containing the textno ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the!from the end of the input.
– JigglyNaga
Dec 10 at 10:31
add a comment |
echo "!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
" | pcregrep -M "^interface .*0/1n (.*n)!"
result:
interface FastEthernet0/1
no ip unreachables
answered Dec 9 at 1:20
Mac Camel
1
The OP only wants to show interfaces containing the textno ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the!from the end of the input.
– JigglyNaga
Dec 10 at 10:31
add a comment |
echo "!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
" | pcregrep -M "^interface .*0/1n (.*n)!"
result:
interface FastEthernet0/1
no ip unreachables
answered Dec 9 at 1:20
Mac Camel
1
echo "!
interface FastEthernet0/1
no ip unreachables
!
interface FastEthernet0/2
no ip proxy-arp
" | pcregrep -M "^interface .*0/1n (.*n)!"
result:
interface FastEthernet0/1
no ip unreachables
answered Dec 9 at 1:20
Mac Camel
1
answered Dec 9 at 1:20
Mac Camel
1
answered Dec 9 at 1:20
Mac Camel
1
answered Dec 9 at 1:20
Mac Camel
1
1
The OP only wants to show interfaces containing the textno ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the!from the end of the input.
– JigglyNaga
Dec 10 at 10:31
add a comment |
The OP only wants to show interfaces containing the textno ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the!from the end of the input.
– JigglyNaga
Dec 10 at 10:31
The OP only wants to show interfaces containing the text
no ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the ! from the end of the input.– JigglyNaga
Dec 10 at 10:31
The OP only wants to show interfaces containing the text
no ip proxy-arp, and your command doesn't check for that. Your result only shows one section (the wrong one) because you've omitted the ! from the end of the input.– JigglyNaga
Dec 10 at 10:31
add a comment |
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Something like
grep -B1 'no ip proxy-arp' file.txt | head -1? What is the expected output?– Teresa e Junior
Apr 12 '13 at 3:16
@TeresaeJunior I don't know whether this is necessary but the awk solutions deliver (possibly) more than one line. Thus the second part of the pipeline should be e.g. another grep.
– Hauke Laging
Apr 12 '13 at 4:07
1
FYI, you asked for
sed|grep|awkassistance; however, ciscoconfparse is a python module which specializes in handling these kind of tasks. If you do a lot of this, it may be worth your while to consider using a library which is built for parsing cisco configs.– Mike Pennington
Feb 8 '14 at 19:31