Ttdfjt

How can I find an old paper when the usual methods fail?

What is the hottest thing in the universe?

Telephone number in spoken words

Why does this Jet Provost strikemaster have a textured leading edge?

How do I call a 6-digit Australian phone number with a US-based mobile phone?

Why did IBM make the PC BIOS source code public?

How to programatically get all linked items for a given Sitecore item?

Setting up a Mathematical Institute of Refereeing?

How to gracefully leave a company you helped start?

What evidence points to a long ō in the first syllable of nōscō's present-tense form?

Source that you can't tell your wife not to lend to others

Bringing Power Supplies on Plane?

How do figure out how powerful I am, when my abilities far exceed my knowledge?

What is a "soap"?

Is there a word for returning to unpreparedness?

What's the point of writing that I know will never be used or read?

Output the list of musical notes

The more + the + comparative degree

Will some rockets really collapse under their own weight?

Locked room poison mystery!

Why do my bicycle brakes get worse and feel more 'squishy" over time?

How can I shoot a bow using Strength instead of Dexterity?

Perpendicular symbol with litle square

Unconventional examples of mathematical modelling

Search and replace a substring only if another substring is not present

Search and replace with sedHow can I replace a string in a file(s)?Find & replace image URLs in one file from another fileHow to replace string of the file, which is present in tar file through UNIXsed append a text with many lines after matching of multiple strings while the text remains many lines in sed commandBash while loop search and replace using sedExtracting values from a text file having | pipe as a delimiter in text file using awk command and Replacing new lines with <br> tag using sed?How to run different python scripts from command line by passing the script name as argumentchange only part of the substring using sedSed to replace lowercase and capital strings

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

2

I have the following strings in a very large document:

1.test.html#
2.test.md#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.md#

Now I want to replace every .md# with .html# but ONLY if there is no http in the string. So only 2 and 6 should have a replacement. How can I do this in a shell script?

shell-script sed

share|improve this question

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

add a comment | 

2

I have the following strings in a very large document:

1.test.html#
2.test.md#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.md#

Now I want to replace every .md# with .html# but ONLY if there is no http in the string. So only 2 and 6 should have a replacement. How can I do this in a shell script?

shell-script sed

share|improve this question

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

add a comment | 

I have the following strings in a very large document:

1.test.html#
2.test.md#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.md#

Now I want to replace every .md# with .html# but ONLY if there is no http in the string. So only 2 and 6 should have a replacement. How can I do this in a shell script?

shell-script sed

share|improve this question

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

1.test.html#
2.test.md#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.md#

share|improve this question

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

share|improve this question

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

asked Aug 4 at 5:26

JeroenJeroen

11344 bronze badges

2 Answers
2

active

oldest

votes

7

With GNU sed. If current line (pattern space) contains http jump to end of script (b). Otherwise do search and replace.

sed '/http/b; s/.md#/.html#/' file

Output:

1.test.html#
2.test.html#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.html#

If you want to edit your file "in place" use sed's option -i.

---

See: man sed

share|improve this answer

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Very good solution. Just as an alternative: sed '/http/! s/.md#/.html#/' file
  
  – John1024
  Aug 4 at 5:49
  
  

  
  
  
  

add a comment | 

2

perl -pe'/http/ or s/.md#/.html#/' input.txt > output.txt
perl -pe'/http/||s/.md#/.html#/' input.txt > output.txt #same
perl -i -pe'/http/||s/.md#/.html#/' file.txt #edit inplace, changes file.txt
perl -i.bk -pe'/http/||s/.md#/.html#/' files*.txt #same with backups to .bk files

sed and awk are great, but perl has everything they have and very much more.

share|improve this answer

edited Aug 5 at 10:55

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges

add a comment | 

Your Answer

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f533784%2fsearch-and-replace-a-substring-only-if-another-substring-is-not-present%23new-answer', 'question_page');

);

Post as a guest

Name

Email

Required, but never shown

7

With GNU sed. If current line (pattern space) contains http jump to end of script (b). Otherwise do search and replace.

sed '/http/b; s/.md#/.html#/' file

Output:

1.test.html#
2.test.html#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.html#

If you want to edit your file "in place" use sed's option -i.

---

See: man sed

share|improve this answer

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Very good solution. Just as an alternative: sed '/http/! s/.md#/.html#/' file
  
  – John1024
  Aug 4 at 5:49
  
  

  
  
  
  

add a comment | 

7

With GNU sed. If current line (pattern space) contains http jump to end of script (b). Otherwise do search and replace.

sed '/http/b; s/.md#/.html#/' file

Output:

1.test.html#
2.test.html#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.html#

If you want to edit your file "in place" use sed's option -i.

---

See: man sed

share|improve this answer

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Very good solution. Just as an alternative: sed '/http/! s/.md#/.html#/' file
  
  – John1024
  Aug 4 at 5:49
  
  

  
  
  
  

add a comment | 

With GNU sed. If current line (pattern space) contains http jump to end of script (b). Otherwise do search and replace.

sed '/http/b; s/.md#/.html#/' file

Output:

1.test.html#
2.test.html#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.html#

If you want to edit your file "in place" use sed's option -i.

---

See: man sed

share|improve this answer

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

sed '/http/b; s/.md#/.html#/' file

1.test.html#
2.test.html#
3.http://test.html#
4.https://test.md#
5.http://test.md#
6.test2.html#

share|improve this answer

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

answered Aug 4 at 5:29

CyrusCyrus

7,87622 gold badges1212 silver badges4141 bronze badges

2

perl -pe'/http/ or s/.md#/.html#/' input.txt > output.txt
perl -pe'/http/||s/.md#/.html#/' input.txt > output.txt #same
perl -i -pe'/http/||s/.md#/.html#/' file.txt #edit inplace, changes file.txt
perl -i.bk -pe'/http/||s/.md#/.html#/' files*.txt #same with backups to .bk files

sed and awk are great, but perl has everything they have and very much more.

share|improve this answer

edited Aug 5 at 10:55

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges

add a comment | 

2

perl -pe'/http/ or s/.md#/.html#/' input.txt > output.txt
perl -pe'/http/||s/.md#/.html#/' input.txt > output.txt #same
perl -i -pe'/http/||s/.md#/.html#/' file.txt #edit inplace, changes file.txt
perl -i.bk -pe'/http/||s/.md#/.html#/' files*.txt #same with backups to .bk files

sed and awk are great, but perl has everything they have and very much more.

share|improve this answer

edited Aug 5 at 10:55

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges

add a comment | 

perl -pe'/http/ or s/.md#/.html#/' input.txt > output.txt
perl -pe'/http/||s/.md#/.html#/' input.txt > output.txt #same
perl -i -pe'/http/||s/.md#/.html#/' file.txt #edit inplace, changes file.txt
perl -i.bk -pe'/http/||s/.md#/.html#/' files*.txt #same with backups to .bk files

sed and awk are great, but perl has everything they have and very much more.

share|improve this answer

edited Aug 5 at 10:55

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges

perl -pe'/http/ or s/.md#/.html#/' input.txt > output.txt
perl -pe'/http/||s/.md#/.html#/' input.txt > output.txt #same
perl -i -pe'/http/||s/.md#/.html#/' file.txt #edit inplace, changes file.txt
perl -i.bk -pe'/http/||s/.md#/.html#/' files*.txt #same with backups to .bk files

share|improve this answer

edited Aug 5 at 10:55

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges

answered Aug 4 at 8:59

Kjetil S.Kjetil S.

17555 bronze badges