Move a line before another in a multi-command sed file

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1
down vote

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I have a text file similar to this:

A
B
C
D
E
F
G

and I need to:

move line E before line C;

replace line C with X (X could be multiline);

replace line G with Y (Y could be multiline);

remove lines D and F.

This is the sed file I have now:

/C/ c
X
/G/ c
Y
/D/ d
/F/ d

which does 2, 3, 4 but not 1. How can I fix the script to move E before C?

Note: I cannot rely on line numbers or contiguity of lines, which may vary; I can only rely on pattern matching.

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

asked 5 hours ago

Giovanni Lovato

1063

New contributor

add a commentÂ |Â

up vote
1
down vote

favorite

I have a text file similar to this:

A
B
C
D
E
F
G

and I need to:

move line E before line C;

replace line C with X (X could be multiline);

replace line G with Y (Y could be multiline);

remove lines D and F.

This is the sed file I have now:

/C/ c
X
/G/ c
Y
/D/ d
/F/ d

which does 2, 3, 4 but not 1. How can I fix the script to move E before C?

Note: I cannot rely on line numbers or contiguity of lines, which may vary; I can only rely on pattern matching.

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

asked 5 hours ago

Giovanni Lovato

1063

New contributor

add a commentÂ |Â

up vote
1
down vote

favorite

I have a text file similar to this:

A
B
C
D
E
F
G

and I need to:

move line E before line C;

replace line C with X (X could be multiline);

replace line G with Y (Y could be multiline);

remove lines D and F.

This is the sed file I have now:

/C/ c
X
/G/ c
Y
/D/ d
/F/ d

which does 2, 3, 4 but not 1. How can I fix the script to move E before C?

Note: I cannot rely on line numbers or contiguity of lines, which may vary; I can only rely on pattern matching.

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

asked 5 hours ago

Giovanni Lovato

1063

New contributor

I have a text file similar to this:

A
B
C
D
E
F
G

and I need to:

move line E before line C;

replace line C with X (X could be multiline);

replace line G with Y (Y could be multiline);

remove lines D and F.

This is the sed file I have now:

/C/ c
X
/G/ c
Y
/D/ d
/F/ d

which does 2, 3, 4 but not 1. How can I fix the script to move E before C?

Note: I cannot rely on line numbers or contiguity of lines, which may vary; I can only rely on pattern matching.

sed

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

asked 5 hours ago

Giovanni Lovato

1063

New contributor

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

asked 5 hours ago

Giovanni Lovato

1063

New contributor

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

edited 5 hours ago

Rui F Ribeiro

37.2k1274118

asked 5 hours ago

Giovanni Lovato

1063

New contributor

asked 5 hours ago

Giovanni Lovato

1063

asked 5 hours ago

Giovanni Lovato

1063

New contributor

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

add a commentÂ |Â

1 Answer
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up vote
2
down vote

For your particular case, this will do:

sed '
/C/,/E/ 
 s/[CD]/&/
 t s
 s/E.*/&
X1
X2/
 t e
 H
 :s
 d
 :e
 p
 x
 D

/F/d
/G/c
Y1
Y2
' file

Someone smarter than me may be able to do it in a simpler way -- notice that this should handle the case where there are other lines than D between C and E. This assumes however that the A, B, ... lines are sorted, ie no G between C and D.

Generally, cases like this are done much more obviously with ed or ex:

$ echo '/E/m/C/-1
/C/c
X1
X2
.
/G/c
Y1
Y2
.
g/[DF]/d
w
' | ed -s file

$ cat file
A
B
E
X1
X2
Y1
Y2

The /PAT1/m/PAT2/-1 command will move the line matching PAT1 before the line matching PAT2.

The /PAT/c command will change the line matching PAT to the following lines terminated by ..

The g/PAT/d command will go to all lines matching PAT and delete them.

edited 34 mins ago

answered 3 hours ago

mosvy

2,755115

... couple of things here: I recommend using a heredoc with ed instead of echo-ing a multiline string and I recommend changing the order of operations with ed/ex to 1-move, 2-delete, 3-change lines just in case the text to be deleted matches anything that is to be inserted; also, I'd use a regex to match either D or F (or separate regexes) instead of a bracket expression: OP's input sample is really unfortunate to say the least, most likely the actual data doesn't consist of single-letter lines; anyway this kind of question can only get punctual answers, there's no generic solution.
â€“Â don_crissti
2 mins ago

add a commentÂ |Â

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1 Answer
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1 Answer
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active

oldest

votes

up vote
2
down vote

For your particular case, this will do:

sed '
/C/,/E/ 
 s/[CD]/&/
 t s
 s/E.*/&
X1
X2/
 t e
 H
 :s
 d
 :e
 p
 x
 D

/F/d
/G/c
Y1
Y2
' file

Generally, cases like this are done much more obviously with ed or ex:

$ echo '/E/m/C/-1
/C/c
X1
X2
.
/G/c
Y1
Y2
.
g/[DF]/d
w
' | ed -s file

$ cat file
A
B
E
X1
X2
Y1
Y2

The /PAT1/m/PAT2/-1 command will move the line matching PAT1 before the line matching PAT2.

The /PAT/c command will change the line matching PAT to the following lines terminated by ..

The g/PAT/d command will go to all lines matching PAT and delete them.

edited 34 mins ago

answered 3 hours ago

mosvy

2,755115

... couple of things here: I recommend using a heredoc with ed instead of echo-ing a multiline string and I recommend changing the order of operations with ed/ex to 1-move, 2-delete, 3-change lines just in case the text to be deleted matches anything that is to be inserted; also, I'd use a regex to match either D or F (or separate regexes) instead of a bracket expression: OP's input sample is really unfortunate to say the least, most likely the actual data doesn't consist of single-letter lines; anyway this kind of question can only get punctual answers, there's no generic solution.
â€“Â don_crissti
2 mins ago

add a commentÂ |Â

up vote
2
down vote

For your particular case, this will do:

sed '
/C/,/E/ 
 s/[CD]/&/
 t s
 s/E.*/&
X1
X2/
 t e
 H
 :s
 d
 :e
 p
 x
 D

/F/d
/G/c
Y1
Y2
' file

Generally, cases like this are done much more obviously with ed or ex:

$ echo '/E/m/C/-1
/C/c
X1
X2
.
/G/c
Y1
Y2
.
g/[DF]/d
w
' | ed -s file

$ cat file
A
B
E
X1
X2
Y1
Y2

The /PAT1/m/PAT2/-1 command will move the line matching PAT1 before the line matching PAT2.

The /PAT/c command will change the line matching PAT to the following lines terminated by ..

The g/PAT/d command will go to all lines matching PAT and delete them.

edited 34 mins ago

answered 3 hours ago

mosvy

2,755115

... couple of things here: I recommend using a heredoc with ed instead of echo-ing a multiline string and I recommend changing the order of operations with ed/ex to 1-move, 2-delete, 3-change lines just in case the text to be deleted matches anything that is to be inserted; also, I'd use a regex to match either D or F (or separate regexes) instead of a bracket expression: OP's input sample is really unfortunate to say the least, most likely the actual data doesn't consist of single-letter lines; anyway this kind of question can only get punctual answers, there's no generic solution.
â€“Â don_crissti
2 mins ago

add a commentÂ |Â

up vote
2
down vote

For your particular case, this will do:

sed '
/C/,/E/ 
 s/[CD]/&/
 t s
 s/E.*/&
X1
X2/
 t e
 H
 :s
 d
 :e
 p
 x
 D

/F/d
/G/c
Y1
Y2
' file

Generally, cases like this are done much more obviously with ed or ex:

$ echo '/E/m/C/-1
/C/c
X1
X2
.
/G/c
Y1
Y2
.
g/[DF]/d
w
' | ed -s file

$ cat file
A
B
E
X1
X2
Y1
Y2

The /PAT1/m/PAT2/-1 command will move the line matching PAT1 before the line matching PAT2.

The /PAT/c command will change the line matching PAT to the following lines terminated by ..

The g/PAT/d command will go to all lines matching PAT and delete them.

edited 34 mins ago

answered 3 hours ago

mosvy

2,755115

For your particular case, this will do:

sed '
/C/,/E/ 
 s/[CD]/&/
 t s
 s/E.*/&
X1
X2/
 t e
 H
 :s
 d
 :e
 p
 x
 D

/F/d
/G/c
Y1
Y2
' file

Generally, cases like this are done much more obviously with ed or ex:

$ echo '/E/m/C/-1
/C/c
X1
X2
.
/G/c
Y1
Y2
.
g/[DF]/d
w
' | ed -s file

$ cat file
A
B
E
X1
X2
Y1
Y2

The /PAT1/m/PAT2/-1 command will move the line matching PAT1 before the line matching PAT2.

The /PAT/c command will change the line matching PAT to the following lines terminated by ..

The g/PAT/d command will go to all lines matching PAT and delete them.

edited 34 mins ago

answered 3 hours ago

mosvy

2,755115

edited 34 mins ago

answered 3 hours ago

mosvy

2,755115

answered 3 hours ago

mosvy

2,755115

answered 3 hours ago

mosvy

2,755115

... couple of things here: I recommend using a heredoc with ed instead of echo-ing a multiline string and I recommend changing the order of operations with ed/ex to 1-move, 2-delete, 3-change lines just in case the text to be deleted matches anything that is to be inserted; also, I'd use a regex to match either D or F (or separate regexes) instead of a bracket expression: OP's input sample is really unfortunate to say the least, most likely the actual data doesn't consist of single-letter lines; anyway this kind of question can only get punctual answers, there's no generic solution.
â€“Â don_crissti
2 mins ago

add a commentÂ |Â

... couple of things here: I recommend using a heredoc with ed instead of echo-ing a multiline string and I recommend changing the order of operations with ed/ex to 1-move, 2-delete, 3-change lines just in case the text to be deleted matches anything that is to be inserted; also, I'd use a regex to match either D or F (or separate regexes) instead of a bracket expression: OP's input sample is really unfortunate to say the least, most likely the actual data doesn't consist of single-letter lines; anyway this kind of question can only get punctual answers, there's no generic solution.
â€“Â don_crissti
2 mins ago

... couple of things here: I recommend using a heredoc with ed instead of echo-ing a multiline string and I recommend changing the order of operations with ed/ex to 1-move, 2-delete, 3-change lines just in case the text to be deleted matches anything that is to be inserted; also, I'd use a regex to match either D or F (or separate regexes) instead of a bracket expression: OP's input sample is really unfortunate to say the least, most likely the actual data doesn't consist of single-letter lines; anyway this kind of question can only get punctual answers, there's no generic solution.
â€“Â don_crissti
2 mins ago

add a commentÂ |Â

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