How sed exact match from url strings in input file and remove it?

Question

I have a input / input file containing lines with urls like this

https://www.youtube.com/watch?v=VXw6OdVmMpw          Mon Nov 2 10:25:32 2015 
https://www.youtube.com/watch?v=VXw6OdVmMpw          Mon Nov 2 10:27:34 2015
https://www.youtube.com/watch?v=VXw6OdVmMpw          Mon Nov 2 10:28:23 2015

I want grep only they exact matched string like if i sed for the last line which is https://www.youtube.com/watch?v=VXw6OdVmMpw Mon Nov 2 10:28:23 2015

so it will delete the last line only Note : Lines may contain same text at front but different date and time so i need exact match , thanks for understanding .

why dont you just `grep` it? if you dont want that line do `grep -v` — Amey Jadiye, Nov 02 '15 at 05:10
grep -v working fine how can i replace the input file content with output content at place ?? — ktechpit.org, Nov 02 '15 at 05:14
sorry i didnt get it ? give example what you want to achive ? you want to replace the grep'ed line with something else ? — Amey Jadiye, Nov 02 '15 at 05:15
am greping the url line from input file say file.txt and i want write the output to same file file.txt — ktechpit.org, Nov 02 '15 at 05:17
like in sed we do sed -i fileinput.txt >fileinput.txt to replace the content of inpput file with the output of sed — ktechpit.org, Nov 02 '15 at 05:18
`cat file.txt | grep -v 'what_you_dont_want' >> file.txt`, but this will keep orignal file same and append output to file, if you wan to remove the content do `cat file.txt | grep -v 'what_you_dont_want' > file1.txt && mv file1.txt file.txt` — Amey Jadiye, Nov 02 '15 at 05:19
no no i want to replace the content at place (input file) we can do that using sed but i dont know how do it with grep . — ktechpit.org, Nov 02 '15 at 05:21
will you please answer the question instead of commenting , i think it is solved , grep cant do inplace replacing . — ktechpit.org, Nov 02 '15 at 05:25
@AmeyJadiye: `cat file | grep something` is [UUOC](http://porkmail.org/era/unix/award.html). Try to avoid it... — anishsane, Nov 02 '15 at 05:36
can you please correct the question, its unclear whats input and whats output you want? so lot of questions are coming in mind. — Amey Jadiye, Nov 02 '15 at 06:12
Regardless of what your problem is, this is probably a duplicate. Have a look at the highest-voted [tag:sed] questions and look for something suitable. — tripleee, Nov 02 '15 at 06:21
possible duplicate of http://stackoverflow.com/questions/5410757/delete-a-line-containing-a-specific-string-using-sed — tripleee, Nov 02 '15 at 06:22

android_su · Answer 1 · 2015-11-02T07:23:38.493

0

Do you just want to use the url at the beginning of line replace the whole line?
Two parts of regex in the command below:
1. Match the URL:

^([a-zA-Z0-9:/.?=]*)

Match the last part:

.*

Then use the URL part replace the whole line.

echo "https://www.youtube.com/watch?v=VXw6OdVmMpw          Mon Nov 2 10:28:23 2015" | sed 's/^\([a-zA-Z0-9:/.?=]*\).*/\1/'

the result is

https://www.youtube.com/watch?v=VXw6OdVmMpw

Is this what you want?

edited Nov 02 '15 at 07:23

answered Nov 02 '15 at 06:38

android_su

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With standard `echo` the result is not what you show. It's not clear how you expect this to solve the OP's question anyway (though the question is also so unclear that this might actually be a possible interpretation, although I don't see how to reach it). – tripleee Nov 02 '15 at 06:54
@tripleee I thought he want to use the url at the beginning of line replace the whole line. – android_su Nov 02 '15 at 07:17
@tripleee I think I am using the standard bash and echo. No alias on echo. Bash version GNU bash 4.3.11(1)-release (x86_64-pc-linux-gnu). – android_su Nov 02 '15 at 07:28

score -2 · Answer 2 · edited Nov 03 '15 at 09:51

-2

required output can be achieved by using:

grep -v 'text to grep'

edited Nov 03 '15 at 09:51

arco444

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answered Nov 02 '15 at 07:26

ktechpit.org

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How sed exact match from url strings in input file and remove it?

2 Answers2