How can sed replace in the range of nth line regex specified?
0
I am to replace using sed the 3th (or nth to be more general) occurrence in respective line with specified match regex.
so far as i can is only to do the first:
$cat file
# Golden dictionary is a versatile multi purpose reference
# Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
so far as i can is only
$ cat file| sed -E '0,/copy/I s//No-&/'
# Golden dictionary is a versatile multi purpose reference
# No-Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
How to do so by such way for the 3th match only?
sed regular-expression gnu
asked Jan 27 at 1:05
abdanabdan
314
add a comment |
0
I am to replace using sed the 3th (or nth to be more general) occurrence in respective line with specified match regex.
so far as i can is only to do the first:
$cat file
# Golden dictionary is a versatile multi purpose reference
# Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
so far as i can is only
$ cat file| sed -E '0,/copy/I s//No-&/'
# Golden dictionary is a versatile multi purpose reference
# No-Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
How to do so by such way for the 3th match only?
sed regular-expression gnu
asked Jan 27 at 1:05
abdanabdan
314
What is the expected output?
– Nasir Riley
Jan 27 at 1:15
You want the third line that contains the text to be prefixed withNo-? Or the third occurrence no matter where it is?
– Jeff Schaller
Jan 27 at 1:32
the third occurrence of respective line, no matter to many occurrences in a line, if 2nd line is # Copyright (C) 2004-2008 Copyright (C) 2009 Copyright (C) 2018 # Copyright (C) 2019 A ,still must find 4th line Copyright (C) 2015-2016 C to be replace then
– abdan
Jan 27 at 2:15
add a comment |
0
0
0
I am to replace using sed the 3th (or nth to be more general) occurrence in respective line with specified match regex.
so far as i can is only to do the first:
$cat file
# Golden dictionary is a versatile multi purpose reference
# Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
so far as i can is only
$ cat file| sed -E '0,/copy/I s//No-&/'
# Golden dictionary is a versatile multi purpose reference
# No-Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
How to do so by such way for the 3th match only?
sed regular-expression gnu
asked Jan 27 at 1:05
abdanabdan
314
I am to replace using sed the 3th (or nth to be more general) occurrence in respective line with specified match regex.
so far as i can is only to do the first:
$cat file
# Golden dictionary is a versatile multi purpose reference
# Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
so far as i can is only
$ cat file| sed -E '0,/copy/I s//No-&/'
# Golden dictionary is a versatile multi purpose reference
# No-Copyright (C) 2004-2008 A
# Copyright (C) 2008-2015 B
# Copyright (C) 2015-2016 C
How to do so by such way for the 3th match only?
sed regular-expression gnu
sed regular-expression gnu
asked Jan 27 at 1:05
abdanabdan
314
asked Jan 27 at 1:05
abdanabdan
314
edited Jan 27 at 2:11
abdan
asked Jan 27 at 1:05
abdanabdan
314
asked Jan 27 at 1:05
abdanabdan
314
asked Jan 27 at 1:05
abdanabdan
314
314
What is the expected output?
– Nasir Riley
Jan 27 at 1:15
You want the third line that contains the text to be prefixed withNo-? Or the third occurrence no matter where it is?
– Jeff Schaller
Jan 27 at 1:32
the third occurrence of respective line, no matter to many occurrences in a line, if 2nd line is # Copyright (C) 2004-2008 Copyright (C) 2009 Copyright (C) 2018 # Copyright (C) 2019 A ,still must find 4th line Copyright (C) 2015-2016 C to be replace then
– abdan
Jan 27 at 2:15
add a comment |
What is the expected output?
– Nasir Riley
Jan 27 at 1:15
You want the third line that contains the text to be prefixed withNo-? Or the third occurrence no matter where it is?
– Jeff Schaller
Jan 27 at 1:32
the third occurrence of respective line, no matter to many occurrences in a line, if 2nd line is # Copyright (C) 2004-2008 Copyright (C) 2009 Copyright (C) 2018 # Copyright (C) 2019 A ,still must find 4th line Copyright (C) 2015-2016 C to be replace then
– abdan
Jan 27 at 2:15
What is the expected output?
– Nasir Riley
Jan 27 at 1:15
What is the expected output?
– Nasir Riley
Jan 27 at 1:15
You want the third line that contains the text to be prefixed with
No-? Or the third occurrence no matter where it is?– Jeff Schaller
Jan 27 at 1:32
You want the third line that contains the text to be prefixed with
No-? Or the third occurrence no matter where it is?– Jeff Schaller
Jan 27 at 1:32
the third occurrence of respective line, no matter to many occurrences in a line, if 2nd line is # Copyright (C) 2004-2008 Copyright (C) 2009 Copyright (C) 2018 # Copyright (C) 2019 A ,still must find 4th line Copyright (C) 2015-2016 C to be replace then
– abdan
Jan 27 at 2:15
the third occurrence of respective line, no matter to many occurrences in a line, if 2nd line is # Copyright (C) 2004-2008 Copyright (C) 2009 Copyright (C) 2018 # Copyright (C) 2019 A ,still must find 4th line Copyright (C) 2015-2016 C to be replace then
– abdan
Jan 27 at 2:15
add a comment |
1 Answer
1
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With ed, prefixing the 3rd case-insensitive "copy" with "No-" would be:
ed -s file <<< $'/[Cc][Oo][Pp][Yy]/n//n//ns//No-&/nwnq' > /dev/null
The commands are:
/[Cc][Oo][Pp][Yy]/-- search, in a manually case-insensitive way for "copy:
//-- repeat the search, twice
s//No-&/-- replace the last match with the "No-" prefix
w-- write the change file to disk
q-- quit ed
With sed, you could do some pre-work to find the line number to change:
sed -i $(grep -in copy file |awk -F: 'NR==3 { print $1 }')'s/copy/No-&/i' input
Working from left to right,
-i-- GNU sed's in-place edit option
$( ... )-- find the line number of the 3rd match of "copy"
grep -in copy file-- find the word "copy", case-insensitively infileand report the line numbers of the matches
awk -F: 'NR==3 { print $1 }'-- on line 3 of grep's output, split the line on colons and report back column 1 (the line number)
s/copy/No-&/i-- replace "copy" with "No-copy", case-insensitively
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
1
Or newish gawk could do the change itself:awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file(for other awk you could do[Cc]etc and theawk ... file >temp && mv temp filedance)
– dave_thompson_085
Jan 27 at 7:41
add a comment |
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1 Answer
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1 Answer
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oldest
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oldest
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1
With ed, prefixing the 3rd case-insensitive "copy" with "No-" would be:
ed -s file <<< $'/[Cc][Oo][Pp][Yy]/n//n//ns//No-&/nwnq' > /dev/null
The commands are:
/[Cc][Oo][Pp][Yy]/-- search, in a manually case-insensitive way for "copy:
//-- repeat the search, twice
s//No-&/-- replace the last match with the "No-" prefix
w-- write the change file to disk
q-- quit ed
With sed, you could do some pre-work to find the line number to change:
sed -i $(grep -in copy file |awk -F: 'NR==3 { print $1 }')'s/copy/No-&/i' input
Working from left to right,
-i-- GNU sed's in-place edit option
$( ... )-- find the line number of the 3rd match of "copy"
grep -in copy file-- find the word "copy", case-insensitively infileand report the line numbers of the matches
awk -F: 'NR==3 { print $1 }'-- on line 3 of grep's output, split the line on colons and report back column 1 (the line number)
s/copy/No-&/i-- replace "copy" with "No-copy", case-insensitively
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
1
Or newish gawk could do the change itself:awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file(for other awk you could do[Cc]etc and theawk ... file >temp && mv temp filedance)
– dave_thompson_085
Jan 27 at 7:41
add a comment |
1
With ed, prefixing the 3rd case-insensitive "copy" with "No-" would be:
ed -s file <<< $'/[Cc][Oo][Pp][Yy]/n//n//ns//No-&/nwnq' > /dev/null
The commands are:
/[Cc][Oo][Pp][Yy]/-- search, in a manually case-insensitive way for "copy:
//-- repeat the search, twice
s//No-&/-- replace the last match with the "No-" prefix
w-- write the change file to disk
q-- quit ed
With sed, you could do some pre-work to find the line number to change:
sed -i $(grep -in copy file |awk -F: 'NR==3 { print $1 }')'s/copy/No-&/i' input
Working from left to right,
-i-- GNU sed's in-place edit option
$( ... )-- find the line number of the 3rd match of "copy"
grep -in copy file-- find the word "copy", case-insensitively infileand report the line numbers of the matches
awk -F: 'NR==3 { print $1 }'-- on line 3 of grep's output, split the line on colons and report back column 1 (the line number)
s/copy/No-&/i-- replace "copy" with "No-copy", case-insensitively
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
1
Or newish gawk could do the change itself:awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file(for other awk you could do[Cc]etc and theawk ... file >temp && mv temp filedance)
– dave_thompson_085
Jan 27 at 7:41
add a comment |
1
1
1
With ed, prefixing the 3rd case-insensitive "copy" with "No-" would be:
ed -s file <<< $'/[Cc][Oo][Pp][Yy]/n//n//ns//No-&/nwnq' > /dev/null
The commands are:
/[Cc][Oo][Pp][Yy]/-- search, in a manually case-insensitive way for "copy:
//-- repeat the search, twice
s//No-&/-- replace the last match with the "No-" prefix
w-- write the change file to disk
q-- quit ed
With sed, you could do some pre-work to find the line number to change:
sed -i $(grep -in copy file |awk -F: 'NR==3 { print $1 }')'s/copy/No-&/i' input
Working from left to right,
-i-- GNU sed's in-place edit option
$( ... )-- find the line number of the 3rd match of "copy"
grep -in copy file-- find the word "copy", case-insensitively infileand report the line numbers of the matches
awk -F: 'NR==3 { print $1 }'-- on line 3 of grep's output, split the line on colons and report back column 1 (the line number)
s/copy/No-&/i-- replace "copy" with "No-copy", case-insensitively
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
With ed, prefixing the 3rd case-insensitive "copy" with "No-" would be:
ed -s file <<< $'/[Cc][Oo][Pp][Yy]/n//n//ns//No-&/nwnq' > /dev/null
The commands are:
/[Cc][Oo][Pp][Yy]/-- search, in a manually case-insensitive way for "copy:
//-- repeat the search, twice
s//No-&/-- replace the last match with the "No-" prefix
w-- write the change file to disk
q-- quit ed
With sed, you could do some pre-work to find the line number to change:
sed -i $(grep -in copy file |awk -F: 'NR==3 { print $1 }')'s/copy/No-&/i' input
Working from left to right,
-i-- GNU sed's in-place edit option
$( ... )-- find the line number of the 3rd match of "copy"
grep -in copy file-- find the word "copy", case-insensitively infileand report the line numbers of the matches
awk -F: 'NR==3 { print $1 }'-- on line 3 of grep's output, split the line on colons and report back column 1 (the line number)
s/copy/No-&/i-- replace "copy" with "No-copy", case-insensitively
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
answered Jan 27 at 1:53
Jeff SchallerJeff Schaller
40.9k1056130
40.9k1056130
1
Or newish gawk could do the change itself:awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file(for other awk you could do[Cc]etc and theawk ... file >temp && mv temp filedance)
– dave_thompson_085
Jan 27 at 7:41
add a comment |
1
Or newish gawk could do the change itself:awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file(for other awk you could do[Cc]etc and theawk ... file >temp && mv temp filedance)
– dave_thompson_085
Jan 27 at 7:41
1
1
Or newish gawk could do the change itself:
awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file (for other awk you could do [Cc] etc and the awk ... file >temp && mv temp file dance)– dave_thompson_085
Jan 27 at 7:41
Or newish gawk could do the change itself:
awk -i inplace -vIGNORECASE=1 '/copy/&&++n==3 {sub(/copy/,"No-&")} 1' file (for other awk you could do [Cc] etc and the awk ... file >temp && mv temp file dance)– dave_thompson_085
Jan 27 at 7:41
add a comment |
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What is the expected output?
– Nasir Riley
Jan 27 at 1:15
You want the third line that contains the text to be prefixed with
No-? Or the third occurrence no matter where it is?– Jeff Schaller
Jan 27 at 1:32
the third occurrence of respective line, no matter to many occurrences in a line, if 2nd line is # Copyright (C) 2004-2008 Copyright (C) 2009 Copyright (C) 2018 # Copyright (C) 2019 A ,still must find 4th line Copyright (C) 2015-2016 C to be replace then
– abdan
Jan 27 at 2:15