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Removing c-style comments with sed

How to delete empty comments with sed?Deleting all C comments with sedHow to remove multiple blank lines from a file?how to select specific range of line & count the specific occurence of the first charcter w.r.t. each unique second charcter?convert C style comments to C++ style using sedSed command that would ignore any commented matchsed stripping comments inlineWhat is the benefit of /etc/apt/sources.list.d over /etc/apt/sources.listsed command removing #Removing characters with sed

1

I need to delete some kind of characteristic, single line C++ comments from all files in our repository. Code looks something like this:

some_code

// characteristic_comment_to_delete

some_more_code // another_comment

another_line_with_code // characteristic_comment_to_delete

even_more_code

As a result, I would like to get this:

some_code

some_more_code // another_comment

another_line_with_code

even_more_code

I used sed command that makes my result almost as good as I would like:

#sed -i -e 's&// characteristic_comment_to_delete.*&&g' some_file.cpp

some_code



some_more_code // another_comment

another_line_with_code

even_more_code

Unfortunately, leaving those blank lines is unacceptable solution, so I need somehow improve my command so that it removes whole line, but only if it is left blank after removing this specific comment.

linux sed

share|improve this question

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

asked 5 hours ago

fortellerforteller

62

New contributor

forteller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @jimmij, the OP doesn't want to remove all comments, only // characteristic_comment_to_delete
  
  – Stéphane Chazelas
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  For C-style comments, How can I delete all characters falling under /* .... */ including /* & */? would be a closer match.
  
  – Stéphane Chazelas
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Off topic, but you're not really running this command as root, are you? That # prompt makes my eye twitch.
  
  – David Conrad
  1 min ago
  

  
  
  
  

add a comment | 

1

I need to delete some kind of characteristic, single line C++ comments from all files in our repository. Code looks something like this:

some_code

// characteristic_comment_to_delete

some_more_code // another_comment

another_line_with_code // characteristic_comment_to_delete

even_more_code

As a result, I would like to get this:

some_code

some_more_code // another_comment

another_line_with_code

even_more_code

I used sed command that makes my result almost as good as I would like:

#sed -i -e 's&// characteristic_comment_to_delete.*&&g' some_file.cpp

some_code



some_more_code // another_comment

another_line_with_code

even_more_code

Unfortunately, leaving those blank lines is unacceptable solution, so I need somehow improve my command so that it removes whole line, but only if it is left blank after removing this specific comment.

linux sed

share|improve this question

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

asked 5 hours ago

fortellerforteller

62

New contributor

forteller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @jimmij, the OP doesn't want to remove all comments, only // characteristic_comment_to_delete
  
  – Stéphane Chazelas
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  For C-style comments, How can I delete all characters falling under /* .... */ including /* & */? would be a closer match.
  
  – Stéphane Chazelas
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Off topic, but you're not really running this command as root, are you? That # prompt makes my eye twitch.
  
  – David Conrad
  1 min ago
  

  
  
  
  

add a comment | 

I need to delete some kind of characteristic, single line C++ comments from all files in our repository. Code looks something like this:

some_code

// characteristic_comment_to_delete

some_more_code // another_comment

another_line_with_code // characteristic_comment_to_delete

even_more_code

As a result, I would like to get this:

some_code

some_more_code // another_comment

another_line_with_code

even_more_code

I used sed command that makes my result almost as good as I would like:

#sed -i -e 's&// characteristic_comment_to_delete.*&&g' some_file.cpp

some_code



some_more_code // another_comment

another_line_with_code

even_more_code

Unfortunately, leaving those blank lines is unacceptable solution, so I need somehow improve my command so that it removes whole line, but only if it is left blank after removing this specific comment.

linux sed

share|improve this question

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

asked 5 hours ago

fortellerforteller

62

New contributor

forteller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

some_code

// characteristic_comment_to_delete

some_more_code // another_comment

another_line_with_code // characteristic_comment_to_delete

even_more_code

some_code

some_more_code // another_comment

another_line_with_code

even_more_code

#sed -i -e 's&// characteristic_comment_to_delete.*&&g' some_file.cpp

some_code



some_more_code // another_comment

another_line_with_code

even_more_code

share|improve this question

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

asked 5 hours ago

fortellerforteller

62

New contributor

forteller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

asked 5 hours ago

fortellerforteller

62

New contributor

forteller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

edited 1 hour ago

Rui F Ribeiro

40.7k1479137

asked 5 hours ago

fortellerforteller

62

New contributor

forteller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 5 hours ago

fortellerforteller

62

4 Answers
4

active

oldest

votes

3

Sed has a d command for deleting whole lines - it can also take an arbitrary (non /) delimiter, however it needs to be escaped with on first use. So you could do something like

$ sed -e '#^// characteristic_comment_to_delete$#d' -e 's#// characteristic_comment_to_delete.*##' file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

to first delete lines that consist entirely of // characteristic_comment_to_delete, then substitute any remaining occurrences.

(I changed your & to # to avoid confusion with the sed & replacement operator).

share|improve this answer

answered 5 hours ago

steeldriversteeldriver

36.4k35286

add a comment | 

1

With GNU sed:

sed 's|s*// characteristic_comment_to_delete.*||;T;/./!d'

T is a GNU extension that branches off unless the previous s substitution was successful. So if no comment was removed, we branch off, and the next /./!d (which deletes the line unless it contains at least one character) is skipped.

Standard equivalent:

sed '/[[:space:]]*// characteristic_comment_to_delete.*/{s///;/./!d;}'

Or:

sed 's|[[:space:]]*// characteristic_comment_to_delete.*||

     t 1

     b

     :1

     /./!d'

Both suppress empty lines only if the substitution was successful.

share|improve this answer

edited 1 min ago

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

add a comment | 

0

If you accept an AWK solution:

awk -F "[   ]*//[   ]*characteristic_comment_to_delete.*" '$1 != "" { print $1; }' some_file.cpp

Note: The pattern contains a space and a TAB between the brackets [ ].

This solution does not correctly handle string literals containing the comment pattern, e.g.
char text[] = "// characteristic_comment_to_delete bla bla";

share|improve this answer

answered 4 hours ago

BodoBodo

1,770212

add a comment | 

0

Demonstrating storing the comment in a shell variable, and escaping the slash characters with shell parameter expansion. Otherwise, same as steeldriver's answer.

$ comment='// characteristic_comment_to_delete'

$ sed -e "/^[[:blank:]]*${comment////\/}/d" -e "s/${comment////\/}.*//" file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

share|improve this answer

answered 1 hour ago

glenn jackmanglenn jackman

52k572112

add a comment | 

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3

Sed has a d command for deleting whole lines - it can also take an arbitrary (non /) delimiter, however it needs to be escaped with on first use. So you could do something like

$ sed -e '#^// characteristic_comment_to_delete$#d' -e 's#// characteristic_comment_to_delete.*##' file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

to first delete lines that consist entirely of // characteristic_comment_to_delete, then substitute any remaining occurrences.

(I changed your & to # to avoid confusion with the sed & replacement operator).

share|improve this answer

answered 5 hours ago

steeldriversteeldriver

36.4k35286

add a comment | 

3

Sed has a d command for deleting whole lines - it can also take an arbitrary (non /) delimiter, however it needs to be escaped with on first use. So you could do something like

$ sed -e '#^// characteristic_comment_to_delete$#d' -e 's#// characteristic_comment_to_delete.*##' file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

to first delete lines that consist entirely of // characteristic_comment_to_delete, then substitute any remaining occurrences.

(I changed your & to # to avoid confusion with the sed & replacement operator).

share|improve this answer

answered 5 hours ago

steeldriversteeldriver

36.4k35286

add a comment | 

Sed has a d command for deleting whole lines - it can also take an arbitrary (non /) delimiter, however it needs to be escaped with on first use. So you could do something like

$ sed -e '#^// characteristic_comment_to_delete$#d' -e 's#// characteristic_comment_to_delete.*##' file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

to first delete lines that consist entirely of // characteristic_comment_to_delete, then substitute any remaining occurrences.

(I changed your & to # to avoid confusion with the sed & replacement operator).

share|improve this answer

answered 5 hours ago

steeldriversteeldriver

36.4k35286

$ sed -e '#^// characteristic_comment_to_delete$#d' -e 's#// characteristic_comment_to_delete.*##' file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

share|improve this answer

answered 5 hours ago

steeldriversteeldriver

36.4k35286

answered 5 hours ago

steeldriversteeldriver

36.4k35286

answered 5 hours ago

steeldriversteeldriver

36.4k35286

1

With GNU sed:

sed 's|s*// characteristic_comment_to_delete.*||;T;/./!d'

T is a GNU extension that branches off unless the previous s substitution was successful. So if no comment was removed, we branch off, and the next /./!d (which deletes the line unless it contains at least one character) is skipped.

Standard equivalent:

sed '/[[:space:]]*// characteristic_comment_to_delete.*/{s///;/./!d;}'

Or:

sed 's|[[:space:]]*// characteristic_comment_to_delete.*||

     t 1

     b

     :1

     /./!d'

Both suppress empty lines only if the substitution was successful.

share|improve this answer

edited 1 min ago

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

add a comment | 

1

With GNU sed:

sed 's|s*// characteristic_comment_to_delete.*||;T;/./!d'

T is a GNU extension that branches off unless the previous s substitution was successful. So if no comment was removed, we branch off, and the next /./!d (which deletes the line unless it contains at least one character) is skipped.

Standard equivalent:

sed '/[[:space:]]*// characteristic_comment_to_delete.*/{s///;/./!d;}'

Or:

sed 's|[[:space:]]*// characteristic_comment_to_delete.*||

     t 1

     b

     :1

     /./!d'

Both suppress empty lines only if the substitution was successful.

share|improve this answer

edited 1 min ago

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

add a comment | 

With GNU sed:

sed 's|s*// characteristic_comment_to_delete.*||;T;/./!d'

T is a GNU extension that branches off unless the previous s substitution was successful. So if no comment was removed, we branch off, and the next /./!d (which deletes the line unless it contains at least one character) is skipped.

Standard equivalent:

sed '/[[:space:]]*// characteristic_comment_to_delete.*/{s///;/./!d;}'

Or:

sed 's|[[:space:]]*// characteristic_comment_to_delete.*||

     t 1

     b

     :1

     /./!d'

Both suppress empty lines only if the substitution was successful.

share|improve this answer

edited 1 min ago

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

sed 's|s*// characteristic_comment_to_delete.*||;T;/./!d'

sed '/[[:space:]]*// characteristic_comment_to_delete.*/{s///;/./!d;}'

sed 's|[[:space:]]*// characteristic_comment_to_delete.*||

     t 1

     b

     :1

     /./!d'

share|improve this answer

edited 1 min ago

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

answered 3 hours ago

Stéphane ChazelasStéphane Chazelas

308k57581939

0

If you accept an AWK solution:

awk -F "[   ]*//[   ]*characteristic_comment_to_delete.*" '$1 != "" { print $1; }' some_file.cpp

Note: The pattern contains a space and a TAB between the brackets [ ].

This solution does not correctly handle string literals containing the comment pattern, e.g.
char text[] = "// characteristic_comment_to_delete bla bla";

share|improve this answer

answered 4 hours ago

BodoBodo

1,770212

add a comment | 

0

If you accept an AWK solution:

awk -F "[   ]*//[   ]*characteristic_comment_to_delete.*" '$1 != "" { print $1; }' some_file.cpp

Note: The pattern contains a space and a TAB between the brackets [ ].

This solution does not correctly handle string literals containing the comment pattern, e.g.
char text[] = "// characteristic_comment_to_delete bla bla";

share|improve this answer

answered 4 hours ago

BodoBodo

1,770212

add a comment | 

If you accept an AWK solution:

awk -F "[   ]*//[   ]*characteristic_comment_to_delete.*" '$1 != "" { print $1; }' some_file.cpp

Note: The pattern contains a space and a TAB between the brackets [ ].

This solution does not correctly handle string literals containing the comment pattern, e.g.
char text[] = "// characteristic_comment_to_delete bla bla";

share|improve this answer

answered 4 hours ago

BodoBodo

1,770212

awk -F "[   ]*//[   ]*characteristic_comment_to_delete.*" '$1 != "" { print $1; }' some_file.cpp

share|improve this answer

answered 4 hours ago

BodoBodo

1,770212

answered 4 hours ago

BodoBodo

1,770212

answered 4 hours ago

BodoBodo

1,770212

0

Demonstrating storing the comment in a shell variable, and escaping the slash characters with shell parameter expansion. Otherwise, same as steeldriver's answer.

$ comment='// characteristic_comment_to_delete'

$ sed -e "/^[[:blank:]]*${comment////\/}/d" -e "s/${comment////\/}.*//" file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

share|improve this answer

answered 1 hour ago

glenn jackmanglenn jackman

52k572112

add a comment | 

0

Demonstrating storing the comment in a shell variable, and escaping the slash characters with shell parameter expansion. Otherwise, same as steeldriver's answer.

$ comment='// characteristic_comment_to_delete'

$ sed -e "/^[[:blank:]]*${comment////\/}/d" -e "s/${comment////\/}.*//" file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

share|improve this answer

answered 1 hour ago

glenn jackmanglenn jackman

52k572112

add a comment | 

Demonstrating storing the comment in a shell variable, and escaping the slash characters with shell parameter expansion. Otherwise, same as steeldriver's answer.

$ comment='// characteristic_comment_to_delete'

$ sed -e "/^[[:blank:]]*${comment////\/}/d" -e "s/${comment////\/}.*//" file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

share|improve this answer

answered 1 hour ago

glenn jackmanglenn jackman

52k572112

$ comment='// characteristic_comment_to_delete'

$ sed -e "/^[[:blank:]]*${comment////\/}/d" -e "s/${comment////\/}.*//" file

some_code

some_more_code // another_comment

another_line_with_code 

even_more_code

share|improve this answer

answered 1 hour ago

glenn jackmanglenn jackman

52k572112

answered 1 hour ago

glenn jackmanglenn jackman

52k572112

answered 1 hour ago

glenn jackmanglenn jackman

52k572112