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uncommenting text with sed is not working [duplicate]

Why does my regular expression work in X but not in Y?Replace regex capture group content using sedHow can I delete all text between curly brackets in a multiline text file?Nginx - access from a public ip address - ubuntu 14.04Remove the exact same matching lines with sedReplacing matching text after two matching linessed multiple statements within a single command not workinggrab text out of vtt filePagespeed + Nginx installation from source failsReplace spaces with sed and regexp grouping not workingsed - calling a variable from a file with multiline

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

1

This question already has an answer here:

• 
  Why does my regular expression work in X but not in Y?
  
  1 answer
  
  

I'm trying to uncomment a 4 line section in an (nginx config) file. Using sed. I first tried with grep and the regexp seems to be correct:

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

However when I try with sed to delete the # at the start of the line it fails:

$ sudo sed -i '/^#.*bny/,+3 s/^#+//' /etc/nginx/sites-enabled/default

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

I think I use the same tactics for commenting the section with sed and that works just fine:

sudo sed -i '/bny/,+3 s/^/#/' /etc/nginx/sites-enabled/default

Even double commenting is no problem. What am I doing wrong with the uncommenting?

ubuntu sed

share|improve this question

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

marked as duplicate by G-Man, msp9011, Community♦ yesterday

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Related, if not a dupe: Why does my regular expression work in X but not in Y?
  
  – Kusalananda♦
  2 days ago
  

  
  
  
  

add a comment | 

1

This question already has an answer here:

• 
  Why does my regular expression work in X but not in Y?
  
  1 answer
  
  

I'm trying to uncomment a 4 line section in an (nginx config) file. Using sed. I first tried with grep and the regexp seems to be correct:

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

However when I try with sed to delete the # at the start of the line it fails:

$ sudo sed -i '/^#.*bny/,+3 s/^#+//' /etc/nginx/sites-enabled/default

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

I think I use the same tactics for commenting the section with sed and that works just fine:

sudo sed -i '/bny/,+3 s/^/#/' /etc/nginx/sites-enabled/default

Even double commenting is no problem. What am I doing wrong with the uncommenting?

ubuntu sed

share|improve this question

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

marked as duplicate by G-Man, msp9011, Community♦ yesterday

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Related, if not a dupe: Why does my regular expression work in X but not in Y?
  
  – Kusalananda♦
  2 days ago
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Why does my regular expression work in X but not in Y?
  
  1 answer
  
  

I'm trying to uncomment a 4 line section in an (nginx config) file. Using sed. I first tried with grep and the regexp seems to be correct:

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

However when I try with sed to delete the # at the start of the line it fails:

$ sudo sed -i '/^#.*bny/,+3 s/^#+//' /etc/nginx/sites-enabled/default

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

I think I use the same tactics for commenting the section with sed and that works just fine:

sudo sed -i '/bny/,+3 s/^/#/' /etc/nginx/sites-enabled/default

Even double commenting is no problem. What am I doing wrong with the uncommenting?

ubuntu sed

share|improve this question

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

$ sudo sed -i '/^#.*bny/,+3 s/^#+//' /etc/nginx/sites-enabled/default

$ grep ^#.*bny /etc/nginx/sites-enabled/default

#        location /bny {

sudo sed -i '/bny/,+3 s/^/#/' /etc/nginx/sites-enabled/default

share|improve this question

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

share|improve this question

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

asked 2 days ago

dr jerrydr jerry

18911 gold badge33 silver badges88 bronze badges

1 Answer
1

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oldest

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4

+ is literal in basic regular expression (BRE) syntax, so your substitution pattern fails to match.

You can use s/^##*//, s/^#{1,}// or (in GNU sed) s/^#+//, or switch to extended regular expressions (ERE) using the -E or -r command line option.

share|improve this answer

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges

add a comment | 

4

+ is literal in basic regular expression (BRE) syntax, so your substitution pattern fails to match.

You can use s/^##*//, s/^#{1,}// or (in GNU sed) s/^#+//, or switch to extended regular expressions (ERE) using the -E or -r command line option.

share|improve this answer

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges

add a comment | 

4

+ is literal in basic regular expression (BRE) syntax, so your substitution pattern fails to match.

You can use s/^##*//, s/^#{1,}// or (in GNU sed) s/^#+//, or switch to extended regular expressions (ERE) using the -E or -r command line option.

share|improve this answer

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges

add a comment | 

+ is literal in basic regular expression (BRE) syntax, so your substitution pattern fails to match.

You can use s/^##*//, s/^#{1,}// or (in GNU sed) s/^#+//, or switch to extended regular expressions (ERE) using the -E or -r command line option.

share|improve this answer

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges

share|improve this answer

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges

answered 2 days ago

steeldriversteeldriver

42.3k55 gold badges5656 silver badges9494 bronze badges