To delete everything between square brackets

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I need to find the line in a lvm.conf file which starts with string, global_filter and remove everything between the square brackets except "r/.*/".



There is only 1 line which starts with global_filter.



Before Removal:



global_filter = [ "a|^/dev/sda.*$|", "a|^/dev/sdb.*$|", "r/.*/"]


After the Removal, it should be - 



global_filter = [, "r/.*/"]





linux sed







share|improve this question























  • Okay, I suppose you know how to address a line in sed and you know the s command, so the only problem is to define a good regex for your match? How about [.*,? Now build your command or ask a specific question.
    – Philippos
    Jul 24 '17 at 11:20










  • Should global_filter lines that do not contain "r/.*/" be modified?
    – Stéphane Chazelas
    Jul 24 '17 at 11:27











  • Are you sure you want to leave the leading comma in?
    – Stéphane Chazelas
    Jul 24 '17 at 11:28










  • Yes I want the comma should be retained. And also only that line in the file should be modified.
    – user7290726
    Jul 24 '17 at 12:43














up vote
0
down vote

favorite
1












I need to find the line in a lvm.conf file which starts with string, global_filter and remove everything between the square brackets except "r/.*/".



There is only 1 line which starts with global_filter.



Before Removal:



global_filter = [ "a|^/dev/sda.*$|", "a|^/dev/sdb.*$|", "r/.*/"]


After the Removal, it should be - 



global_filter = [, "r/.*/"]





linux sed







share|improve this question























  • Okay, I suppose you know how to address a line in sed and you know the s command, so the only problem is to define a good regex for your match? How about [.*,? Now build your command or ask a specific question.
    – Philippos
    Jul 24 '17 at 11:20










  • Should global_filter lines that do not contain "r/.*/" be modified?
    – Stéphane Chazelas
    Jul 24 '17 at 11:27











  • Are you sure you want to leave the leading comma in?
    – Stéphane Chazelas
    Jul 24 '17 at 11:28










  • Yes I want the comma should be retained. And also only that line in the file should be modified.
    – user7290726
    Jul 24 '17 at 12:43












up vote
0
down vote

favorite
1









up vote
0
down vote

favorite
1






1





I need to find the line in a lvm.conf file which starts with string, global_filter and remove everything between the square brackets except "r/.*/".



There is only 1 line which starts with global_filter.



Before Removal:



global_filter = [ "a|^/dev/sda.*$|", "a|^/dev/sdb.*$|", "r/.*/"]


After the Removal, it should be - 



global_filter = [, "r/.*/"]





linux sed







share|improve this question















I need to find the line in a lvm.conf file which starts with string, global_filter and remove everything between the square brackets except "r/.*/".



There is only 1 line which starts with global_filter.



Before Removal:



global_filter = [ "a|^/dev/sda.*$|", "a|^/dev/sdb.*$|", "r/.*/"]


After the Removal, it should be - 



global_filter = [, "r/.*/"]





linux sed




linux sed






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 at 22:25









Rui F Ribeiro

38.2k1475125




38.2k1475125










asked Jul 24 '17 at 11:11









user7290726

348




348











  • Okay, I suppose you know how to address a line in sed and you know the s command, so the only problem is to define a good regex for your match? How about [.*,? Now build your command or ask a specific question.
    – Philippos
    Jul 24 '17 at 11:20










  • Should global_filter lines that do not contain "r/.*/" be modified?
    – Stéphane Chazelas
    Jul 24 '17 at 11:27











  • Are you sure you want to leave the leading comma in?
    – Stéphane Chazelas
    Jul 24 '17 at 11:28










  • Yes I want the comma should be retained. And also only that line in the file should be modified.
    – user7290726
    Jul 24 '17 at 12:43
















  • Okay, I suppose you know how to address a line in sed and you know the s command, so the only problem is to define a good regex for your match? How about [.*,? Now build your command or ask a specific question.
    – Philippos
    Jul 24 '17 at 11:20










  • Should global_filter lines that do not contain "r/.*/" be modified?
    – Stéphane Chazelas
    Jul 24 '17 at 11:27











  • Are you sure you want to leave the leading comma in?
    – Stéphane Chazelas
    Jul 24 '17 at 11:28










  • Yes I want the comma should be retained. And also only that line in the file should be modified.
    – user7290726
    Jul 24 '17 at 12:43















Okay, I suppose you know how to address a line in sed and you know the s command, so the only problem is to define a good regex for your match? How about [.*,? Now build your command or ask a specific question.
– Philippos
Jul 24 '17 at 11:20




Okay, I suppose you know how to address a line in sed and you know the s command, so the only problem is to define a good regex for your match? How about [.*,? Now build your command or ask a specific question.
– Philippos
Jul 24 '17 at 11:20












Should global_filter lines that do not contain "r/.*/" be modified?
– Stéphane Chazelas
Jul 24 '17 at 11:27





Should global_filter lines that do not contain "r/.*/" be modified?
– Stéphane Chazelas
Jul 24 '17 at 11:27













Are you sure you want to leave the leading comma in?
– Stéphane Chazelas
Jul 24 '17 at 11:28




Are you sure you want to leave the leading comma in?
– Stéphane Chazelas
Jul 24 '17 at 11:28












Yes I want the comma should be retained. And also only that line in the file should be modified.
– user7290726
Jul 24 '17 at 12:43




Yes I want the comma should be retained. And also only that line in the file should be modified.
– user7290726
Jul 24 '17 at 12:43










2 Answers
2






active

oldest

votes

















up vote
1
down vote



accepted










sed -i -e '/^global_filter/' data


Explanation



sed -i -e '
 # look at only lines that begin with global_filter
 /^global_filter/"r/.*/"
' data





share|improve this answer






















  • Thanks for the help. This replaces the entire file. I want only that line to be modified.
    – user7290726
    Jul 24 '17 at 12:44










  • I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
    – user7290726
    Jul 24 '17 at 12:54











  • Can you please help me in that.
    – user7290726
    Jul 24 '17 at 12:55










  • Yes I tried with the first method itself. It is giving duplicate entry in the file.
    – user7290726
    Jul 24 '17 at 13:03










  • With -n option, the entire file is being replaced by just the global_filter line.
    – user7290726
    Jul 24 '17 at 13:14

















up vote
0
down vote













Try this:



$ echo 'global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/.*/"]'|
sed -E 's/(^global_filter = [)(.*)(, "r.*$)/13/'


Output:



global_filter = [, "r/.*/"]





share|improve this answer






















  • Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
    – user218374
    Jul 24 '17 at 11:24










  • Sorry John this is not working
    – user7290726
    Jul 24 '17 at 13:04











  • I mean for file input, I could not get this working.. can you help me out.
    – user7290726
    Jul 24 '17 at 13:15










  • @user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
    – John Goofy
    Jul 24 '17 at 13:20










  • The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
    – user7290726
    Jul 26 '17 at 2:55










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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
1
down vote



accepted










sed -i -e '/^global_filter/' data


Explanation



sed -i -e '
 # look at only lines that begin with global_filter
 /^global_filter/"r/.*/"
' data





share|improve this answer






















  • Thanks for the help. This replaces the entire file. I want only that line to be modified.
    – user7290726
    Jul 24 '17 at 12:44










  • I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
    – user7290726
    Jul 24 '17 at 12:54











  • Can you please help me in that.
    – user7290726
    Jul 24 '17 at 12:55










  • Yes I tried with the first method itself. It is giving duplicate entry in the file.
    – user7290726
    Jul 24 '17 at 13:03










  • With -n option, the entire file is being replaced by just the global_filter line.
    – user7290726
    Jul 24 '17 at 13:14














up vote
1
down vote



accepted










sed -i -e '/^global_filter/' data


Explanation



sed -i -e '
 # look at only lines that begin with global_filter
 /^global_filter/"r/.*/"
' data





share|improve this answer






















  • Thanks for the help. This replaces the entire file. I want only that line to be modified.
    – user7290726
    Jul 24 '17 at 12:44










  • I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
    – user7290726
    Jul 24 '17 at 12:54











  • Can you please help me in that.
    – user7290726
    Jul 24 '17 at 12:55










  • Yes I tried with the first method itself. It is giving duplicate entry in the file.
    – user7290726
    Jul 24 '17 at 13:03










  • With -n option, the entire file is being replaced by just the global_filter line.
    – user7290726
    Jul 24 '17 at 13:14












up vote
1
down vote



accepted







up vote
1
down vote



accepted






sed -i -e '/^global_filter/' data


Explanation



sed -i -e '
 # look at only lines that begin with global_filter
 /^global_filter/"r/.*/"
' data





share|improve this answer














sed -i -e '/^global_filter/' data


Explanation



sed -i -e '
 # look at only lines that begin with global_filter
 /^global_filter/"r/.*/"
' data






share|improve this answer














share|improve this answer



share|improve this answer








edited Jul 24 '17 at 13:15

























answered Jul 24 '17 at 11:21







user218374


















  • Thanks for the help. This replaces the entire file. I want only that line to be modified.
    – user7290726
    Jul 24 '17 at 12:44










  • I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
    – user7290726
    Jul 24 '17 at 12:54











  • Can you please help me in that.
    – user7290726
    Jul 24 '17 at 12:55










  • Yes I tried with the first method itself. It is giving duplicate entry in the file.
    – user7290726
    Jul 24 '17 at 13:03










  • With -n option, the entire file is being replaced by just the global_filter line.
    – user7290726
    Jul 24 '17 at 13:14
















  • Thanks for the help. This replaces the entire file. I want only that line to be modified.
    – user7290726
    Jul 24 '17 at 12:44










  • I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
    – user7290726
    Jul 24 '17 at 12:54











  • Can you please help me in that.
    – user7290726
    Jul 24 '17 at 12:55










  • Yes I tried with the first method itself. It is giving duplicate entry in the file.
    – user7290726
    Jul 24 '17 at 13:03










  • With -n option, the entire file is being replaced by just the global_filter line.
    – user7290726
    Jul 24 '17 at 13:14















Thanks for the help. This replaces the entire file. I want only that line to be modified.
– user7290726
Jul 24 '17 at 12:44




Thanks for the help. This replaces the entire file. I want only that line to be modified.
– user7290726
Jul 24 '17 at 12:44












I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
– user7290726
Jul 24 '17 at 12:54





I modified the command by replacing the -n flag by -i and it worked. It is working as expected but I am seeing a duplicate entry the next line.
– user7290726
Jul 24 '17 at 12:54













Can you please help me in that.
– user7290726
Jul 24 '17 at 12:55




Can you please help me in that.
– user7290726
Jul 24 '17 at 12:55












Yes I tried with the first method itself. It is giving duplicate entry in the file.
– user7290726
Jul 24 '17 at 13:03




Yes I tried with the first method itself. It is giving duplicate entry in the file.
– user7290726
Jul 24 '17 at 13:03












With -n option, the entire file is being replaced by just the global_filter line.
– user7290726
Jul 24 '17 at 13:14




With -n option, the entire file is being replaced by just the global_filter line.
– user7290726
Jul 24 '17 at 13:14












up vote
0
down vote













Try this:



$ echo 'global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/.*/"]'|
sed -E 's/(^global_filter = [)(.*)(, "r.*$)/13/'


Output:



global_filter = [, "r/.*/"]





share|improve this answer






















  • Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
    – user218374
    Jul 24 '17 at 11:24










  • Sorry John this is not working
    – user7290726
    Jul 24 '17 at 13:04











  • I mean for file input, I could not get this working.. can you help me out.
    – user7290726
    Jul 24 '17 at 13:15










  • @user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
    – John Goofy
    Jul 24 '17 at 13:20










  • The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
    – user7290726
    Jul 26 '17 at 2:55














up vote
0
down vote













Try this:



$ echo 'global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/.*/"]'|
sed -E 's/(^global_filter = [)(.*)(, "r.*$)/13/'


Output:



global_filter = [, "r/.*/"]





share|improve this answer






















  • Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
    – user218374
    Jul 24 '17 at 11:24










  • Sorry John this is not working
    – user7290726
    Jul 24 '17 at 13:04











  • I mean for file input, I could not get this working.. can you help me out.
    – user7290726
    Jul 24 '17 at 13:15










  • @user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
    – John Goofy
    Jul 24 '17 at 13:20










  • The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
    – user7290726
    Jul 26 '17 at 2:55












up vote
0
down vote










up vote
0
down vote









Try this:



$ echo 'global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/.*/"]'|
sed -E 's/(^global_filter = [)(.*)(, "r.*$)/13/'


Output:



global_filter = [, "r/.*/"]





share|improve this answer














Try this:



$ echo 'global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/.*/"]'|
sed -E 's/(^global_filter = [)(.*)(, "r.*$)/13/'


Output:



global_filter = [, "r/.*/"]






share|improve this answer














share|improve this answer



share|improve this answer








edited Jul 24 '17 at 11:50

























answered Jul 24 '17 at 11:21









John Goofy

556113




556113











  • Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
    – user218374
    Jul 24 '17 at 11:24










  • Sorry John this is not working
    – user7290726
    Jul 24 '17 at 13:04











  • I mean for file input, I could not get this working.. can you help me out.
    – user7290726
    Jul 24 '17 at 13:15










  • @user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
    – John Goofy
    Jul 24 '17 at 13:20










  • The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
    – user7290726
    Jul 26 '17 at 2:55
















  • Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
    – user218374
    Jul 24 '17 at 11:24










  • Sorry John this is not working
    – user7290726
    Jul 24 '17 at 13:04











  • I mean for file input, I could not get this working.. can you help me out.
    – user7290726
    Jul 24 '17 at 13:15










  • @user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
    – John Goofy
    Jul 24 '17 at 13:20










  • The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
    – user7290726
    Jul 26 '17 at 2:55















Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
– user218374
Jul 24 '17 at 11:24




Just try on the input: global_filter = [ "a|^/dev/sda.$|", "a|^/dev/sdb.$|", "r/Dot_Star/"]'
– user218374
Jul 24 '17 at 11:24












Sorry John this is not working
– user7290726
Jul 24 '17 at 13:04





Sorry John this is not working
– user7290726
Jul 24 '17 at 13:04













I mean for file input, I could not get this working.. can you help me out.
– user7290726
Jul 24 '17 at 13:15




I mean for file input, I could not get this working.. can you help me out.
– user7290726
Jul 24 '17 at 13:15












@user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
– John Goofy
Jul 24 '17 at 13:20




@user7290726 I see. Could you please than post an excerpt of your input file to make it easier to guess what you want?
– John Goofy
Jul 24 '17 at 13:20












The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
– user7290726
Jul 26 '17 at 2:55




The file has only 1 line which starts with global_filter. And I need the changes as said earlier.
– user7290726
Jul 26 '17 at 2:55

















 

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