Swap a line with another
I have the file
Line 1
Line 2 MATCH
Line 3
Line 4
Line 1
Line 2 MATCH
Line 3
Line 4
And I want to swap the line with "MATCH" and "Line 1" for every case. I tried to search in other questions, but those move the line with the match to the last line and I don't understand so well the code to remake my version for a final output like:
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
text-processing sed
asked 5 hours ago
TheAskerTheAsker
82
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TheAsker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have the file
Line 1
Line 2 MATCH
Line 3
Line 4
Line 1
Line 2 MATCH
Line 3
Line 4
And I want to swap the line with "MATCH" and "Line 1" for every case. I tried to search in other questions, but those move the line with the match to the last line and I don't understand so well the code to remake my version for a final output like:
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
text-processing sed
asked 5 hours ago
TheAskerTheAsker
82
New contributor
TheAsker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is the line with "MATCH" always line two, hence to be swapped with the line before it?
– Sparhawk
4 hours ago
@Sparhawk Yes, it is.
– TheAsker
4 hours ago
@don_crissti but in the answer provided there, they only swap the line N with the line below. For swap line N with the line above, they swap the Line N-1 with the line below. There is some way to swap with the line above based on a pattern?
– TheAsker
4 hours ago
add a comment |
I have the file
Line 1
Line 2 MATCH
Line 3
Line 4
Line 1
Line 2 MATCH
Line 3
Line 4
And I want to swap the line with "MATCH" and "Line 1" for every case. I tried to search in other questions, but those move the line with the match to the last line and I don't understand so well the code to remake my version for a final output like:
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
text-processing sed
asked 5 hours ago
TheAskerTheAsker
82
New contributor
TheAsker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have the file
Line 1
Line 2 MATCH
Line 3
Line 4
Line 1
Line 2 MATCH
Line 3
Line 4
And I want to swap the line with "MATCH" and "Line 1" for every case. I tried to search in other questions, but those move the line with the match to the last line and I don't understand so well the code to remake my version for a final output like:
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
text-processing sed
text-processing sed
asked 5 hours ago
TheAskerTheAsker
82
New contributor
TheAsker 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
TheAskerTheAsker
82
New contributor
TheAsker 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
TheAskerTheAsker
82
New contributor
TheAsker 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
TheAskerTheAsker
82
asked 5 hours ago
TheAskerTheAsker
82
82
New contributor
TheAsker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
TheAsker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
TheAsker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is the line with "MATCH" always line two, hence to be swapped with the line before it?
– Sparhawk
4 hours ago
@Sparhawk Yes, it is.
– TheAsker
4 hours ago
@don_crissti but in the answer provided there, they only swap the line N with the line below. For swap line N with the line above, they swap the Line N-1 with the line below. There is some way to swap with the line above based on a pattern?
– TheAsker
4 hours ago
add a comment |
Is the line with "MATCH" always line two, hence to be swapped with the line before it?
– Sparhawk
4 hours ago
@Sparhawk Yes, it is.
– TheAsker
4 hours ago
@don_crissti but in the answer provided there, they only swap the line N with the line below. For swap line N with the line above, they swap the Line N-1 with the line below. There is some way to swap with the line above based on a pattern?
– TheAsker
4 hours ago
Is the line with "MATCH" always line two, hence to be swapped with the line before it?
– Sparhawk
4 hours ago
Is the line with "MATCH" always line two, hence to be swapped with the line before it?
– Sparhawk
4 hours ago
@Sparhawk Yes, it is.
– TheAsker
4 hours ago
@Sparhawk Yes, it is.
– TheAsker
4 hours ago
@don_crissti but in the answer provided there, they only swap the line N with the line below. For swap line N with the line above, they swap the Line N-1 with the line below. There is some way to swap with the line above based on a pattern?
– TheAsker
4 hours ago
@don_crissti but in the answer provided there, they only swap the line N with the line below. For swap line N with the line above, they swap the Line N-1 with the line below. There is some way to swap with the line above based on a pattern?
– TheAsker
4 hours ago
add a comment |
4 Answers
4
active
oldest
votes
If the idea is to swap the MATCH line with the immediately preceding one, then something like this would do:
$ awk '!/MATCH/ { if (NR > 1) print prev; prev=$0}
/MATCH/ {print $0;}
END {print prev}' < file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The script holds the previous line in prev, printing and updating it on the non-matching lines. On lines matching the pattern, it prints the current line, leaving the previous in the variable to be printed next.
Special cases for the first line (NR==1) when there's no previous line to print, and for the END when we print the held line.
answered 4 hours ago
ilkkachuilkkachu
59k892166
add a comment |
Using ed:
$ printf 'g/MATCH/m-2n,pn' | ed -s file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The m command moves the current line to the subsequent target address. Here, we find all lines matching MATCH (it's the g in front of the regular expression that makes this a "global" operation), and for each line move it one line up. The effect is that the MATCH lines swap places with the immediately preceding lines. We use -2 since the m command moves the line to after the targeted line.
The final ,p in the editing script just displays the modified editing buffer.
answered 2 hours ago
KusalanandaKusalananda
130k17247407
add a comment |
Using sed with a N;P;D cycle:
sed -e '$!N;s/(Line 1)(n)(.*MATCH.*)/321/;t' -e 'P;D' infile
This will swap only if the line with MATCH is preceded by Line 1: the t without label branches to the end of script if successful and so it avoids another swap if any Line 1 is followed by consecutive lines with MATCH. Adjust the regex for any leading/trailing blanks.
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
add a comment |
sed "s/line 2 match//g"|sed "s/line 1/line 2 matchn&/g"
Above command worked fine
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
The lines withMATCHshould swap places with the preceding lines.
– Kusalananda
2 hours ago
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
If the idea is to swap the MATCH line with the immediately preceding one, then something like this would do:
$ awk '!/MATCH/ { if (NR > 1) print prev; prev=$0}
/MATCH/ {print $0;}
END {print prev}' < file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The script holds the previous line in prev, printing and updating it on the non-matching lines. On lines matching the pattern, it prints the current line, leaving the previous in the variable to be printed next.
Special cases for the first line (NR==1) when there's no previous line to print, and for the END when we print the held line.
answered 4 hours ago
ilkkachuilkkachu
59k892166
add a comment |
If the idea is to swap the MATCH line with the immediately preceding one, then something like this would do:
$ awk '!/MATCH/ { if (NR > 1) print prev; prev=$0}
/MATCH/ {print $0;}
END {print prev}' < file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The script holds the previous line in prev, printing and updating it on the non-matching lines. On lines matching the pattern, it prints the current line, leaving the previous in the variable to be printed next.
Special cases for the first line (NR==1) when there's no previous line to print, and for the END when we print the held line.
answered 4 hours ago
ilkkachuilkkachu
59k892166
add a comment |
If the idea is to swap the MATCH line with the immediately preceding one, then something like this would do:
$ awk '!/MATCH/ { if (NR > 1) print prev; prev=$0}
/MATCH/ {print $0;}
END {print prev}' < file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The script holds the previous line in prev, printing and updating it on the non-matching lines. On lines matching the pattern, it prints the current line, leaving the previous in the variable to be printed next.
Special cases for the first line (NR==1) when there's no previous line to print, and for the END when we print the held line.
answered 4 hours ago
ilkkachuilkkachu
59k892166
If the idea is to swap the MATCH line with the immediately preceding one, then something like this would do:
$ awk '!/MATCH/ { if (NR > 1) print prev; prev=$0}
/MATCH/ {print $0;}
END {print prev}' < file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The script holds the previous line in prev, printing and updating it on the non-matching lines. On lines matching the pattern, it prints the current line, leaving the previous in the variable to be printed next.
Special cases for the first line (NR==1) when there's no previous line to print, and for the END when we print the held line.
answered 4 hours ago
ilkkachuilkkachu
59k892166
answered 4 hours ago
ilkkachuilkkachu
59k892166
answered 4 hours ago
ilkkachuilkkachu
59k892166
answered 4 hours ago
ilkkachuilkkachu
59k892166
59k892166
add a comment |
add a comment |
Using ed:
$ printf 'g/MATCH/m-2n,pn' | ed -s file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The m command moves the current line to the subsequent target address. Here, we find all lines matching MATCH (it's the g in front of the regular expression that makes this a "global" operation), and for each line move it one line up. The effect is that the MATCH lines swap places with the immediately preceding lines. We use -2 since the m command moves the line to after the targeted line.
The final ,p in the editing script just displays the modified editing buffer.
answered 2 hours ago
KusalanandaKusalananda
130k17247407
add a comment |
Using ed:
$ printf 'g/MATCH/m-2n,pn' | ed -s file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The m command moves the current line to the subsequent target address. Here, we find all lines matching MATCH (it's the g in front of the regular expression that makes this a "global" operation), and for each line move it one line up. The effect is that the MATCH lines swap places with the immediately preceding lines. We use -2 since the m command moves the line to after the targeted line.
The final ,p in the editing script just displays the modified editing buffer.
answered 2 hours ago
KusalanandaKusalananda
130k17247407
add a comment |
Using ed:
$ printf 'g/MATCH/m-2n,pn' | ed -s file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The m command moves the current line to the subsequent target address. Here, we find all lines matching MATCH (it's the g in front of the regular expression that makes this a "global" operation), and for each line move it one line up. The effect is that the MATCH lines swap places with the immediately preceding lines. We use -2 since the m command moves the line to after the targeted line.
The final ,p in the editing script just displays the modified editing buffer.
answered 2 hours ago
KusalanandaKusalananda
130k17247407
Using ed:
$ printf 'g/MATCH/m-2n,pn' | ed -s file
Line 2 MATCH
Line 1
Line 3
Line 4
Line 2 MATCH
Line 1
Line 3
Line 4
The m command moves the current line to the subsequent target address. Here, we find all lines matching MATCH (it's the g in front of the regular expression that makes this a "global" operation), and for each line move it one line up. The effect is that the MATCH lines swap places with the immediately preceding lines. We use -2 since the m command moves the line to after the targeted line.
The final ,p in the editing script just displays the modified editing buffer.
answered 2 hours ago
KusalanandaKusalananda
130k17247407
edited 2 hours ago
answered 2 hours ago
KusalanandaKusalananda
130k17247407
answered 2 hours ago
KusalanandaKusalananda
130k17247407
answered 2 hours ago
KusalanandaKusalananda
130k17247407
130k17247407
add a comment |
add a comment |
Using sed with a N;P;D cycle:
sed -e '$!N;s/(Line 1)(n)(.*MATCH.*)/321/;t' -e 'P;D' infile
This will swap only if the line with MATCH is preceded by Line 1: the t without label branches to the end of script if successful and so it avoids another swap if any Line 1 is followed by consecutive lines with MATCH. Adjust the regex for any leading/trailing blanks.
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
add a comment |
Using sed with a N;P;D cycle:
sed -e '$!N;s/(Line 1)(n)(.*MATCH.*)/321/;t' -e 'P;D' infile
This will swap only if the line with MATCH is preceded by Line 1: the t without label branches to the end of script if successful and so it avoids another swap if any Line 1 is followed by consecutive lines with MATCH. Adjust the regex for any leading/trailing blanks.
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
add a comment |
Using sed with a N;P;D cycle:
sed -e '$!N;s/(Line 1)(n)(.*MATCH.*)/321/;t' -e 'P;D' infile
This will swap only if the line with MATCH is preceded by Line 1: the t without label branches to the end of script if successful and so it avoids another swap if any Line 1 is followed by consecutive lines with MATCH. Adjust the regex for any leading/trailing blanks.
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
Using sed with a N;P;D cycle:
sed -e '$!N;s/(Line 1)(n)(.*MATCH.*)/321/;t' -e 'P;D' infile
This will swap only if the line with MATCH is preceded by Line 1: the t without label branches to the end of script if successful and so it avoids another swap if any Line 1 is followed by consecutive lines with MATCH. Adjust the regex for any leading/trailing blanks.
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
answered 4 hours ago
don_crisstidon_crissti
50.9k15135163
50.9k15135163
add a comment |
add a comment |
sed "s/line 2 match//g"|sed "s/line 1/line 2 matchn&/g"
Above command worked fine
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
The lines withMATCHshould swap places with the preceding lines.
– Kusalananda
2 hours ago
add a comment |
sed "s/line 2 match//g"|sed "s/line 1/line 2 matchn&/g"
Above command worked fine
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
The lines withMATCHshould swap places with the preceding lines.
– Kusalananda
2 hours ago
add a comment |
sed "s/line 2 match//g"|sed "s/line 1/line 2 matchn&/g"
Above command worked fine
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
sed "s/line 2 match//g"|sed "s/line 1/line 2 matchn&/g"
Above command worked fine
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
answered 2 hours ago
Praveen Kumar BSPraveen Kumar BS
1,474138
1,474138
The lines withMATCHshould swap places with the preceding lines.
– Kusalananda
2 hours ago
add a comment |
The lines withMATCHshould swap places with the preceding lines.
– Kusalananda
2 hours ago
The lines with
MATCH should swap places with the preceding lines.– Kusalananda
2 hours ago
The lines with
MATCH should swap places with the preceding lines.– Kusalananda
2 hours ago
add a comment |
TheAsker is a new contributor. Be nice, and check out our Code of Conduct.
TheAsker is a new contributor. Be nice, and check out our Code of Conduct.
TheAsker is a new contributor. Be nice, and check out our Code of Conduct.
TheAsker is a new contributor. Be nice, and check out our Code of Conduct.
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Is the line with "MATCH" always line two, hence to be swapped with the line before it?
– Sparhawk
4 hours ago
@Sparhawk Yes, it is.
– TheAsker
4 hours ago
@don_crissti but in the answer provided there, they only swap the line N with the line below. For swap line N with the line above, they swap the Line N-1 with the line below. There is some way to swap with the line above based on a pattern?
– TheAsker
4 hours ago