sed 's/-([0-9.]+)/(1)/g' inputfile what does this command mean?

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I am trying to find out what the following command means:

sed 's/-([0-9.]+)/(1)/g' inputfile

I know it has to do with non-digit characters.

sed

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edited 18 mins ago

ilkkachu

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asked 27 mins ago

Quincy Darko

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up vote
2
down vote

favorite

I am trying to find out what the following command means:

sed 's/-([0-9.]+)/(1)/g' inputfile

I know it has to do with non-digit characters.

sed

share|improve this question

edited 18 mins ago

ilkkachu

51.5k678142

asked 27 mins ago

Quincy Darko

211

New contributor

Quincy Darko 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 | 

up vote
2
down vote

favorite

up vote
2
down vote

favorite

I am trying to find out what the following command means:

sed 's/-([0-9.]+)/(1)/g' inputfile

I know it has to do with non-digit characters.

sed

share|improve this question

edited 18 mins ago

ilkkachu

51.5k678142

asked 27 mins ago

Quincy Darko

211

New contributor

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

I am trying to find out what the following command means:

sed 's/-([0-9.]+)/(1)/g' inputfile

I know it has to do with non-digit characters.

sed

sed

share|improve this question

edited 18 mins ago

ilkkachu

51.5k678142

asked 27 mins ago

Quincy Darko

211

New contributor

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

share|improve this question

edited 18 mins ago

ilkkachu

51.5k678142

asked 27 mins ago

Quincy Darko

211

New contributor

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

share|improve this question

share|improve this question

edited 18 mins ago

ilkkachu

51.5k678142

edited 18 mins ago

ilkkachu

51.5k678142

edited 18 mins ago

ilkkachu

51.5k678142

51.5k678142

asked 27 mins ago

Quincy Darko

211

New contributor

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

asked 27 mins ago

Quincy Darko

211

asked 27 mins ago

Quincy Darko

211

211

New contributor

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

New contributor

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

Quincy Darko 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 | 

add a comment | 

2 Answers
2

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oldest

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up vote
2
down vote

In GNU sed, it looks for a dash followed by some digits or dots, and replaces that with the same digits in parenthesis. That is, it turns -123.45 into (123.45).

In standard sed, it looks for a dash, a digit or dot, and a plus sign, and then removes the dash and surrounds the rest in parenthesis. That is, it turns -1+ into (1+), but leaves stuff like -123 as-is.

---

Taken apart, in the left-hand pattern, the dash matches itself, [0-9.] matches any one digit or dot, and the ( ) capture the part in between. In the replacement, the parenthesis are literal, and 1 puts back whatever was within the ( ).

In extended regular expressions, a + means "one or more of the previous", so [0-9.]+ would mean "one or more digits or dots". In a standard regex, neither + or + has any special meaning, however, but GNU systems are a bit lax on that, and + takes the "one or more" sense there.

Portably, that should be either

sed -E 's/-([0-9.]+)/(1)/' 

or

sed 's/-([0-9.]1,)/(1)/' 

Both of which will replace a dash in front of a number with parenthesis around it.

share|improve this answer

edited 4 mins ago

answered 10 mins ago

ilkkachu

51.5k678142

add a comment | 

up vote
1
down vote

Looks like it changing the format of negative numbers from having a - in front of them to instead being surrounded by parentheses.

It searches for a sequence that starts with - followed by a sequence of numerals and decimals [0-9.] being a match to numerals and decimals, and + modifying it to match one or more such character in a sequence. The sequence of numerals and decimals are inside (...), which is the first expression, and in the replacement clause, (1) will paste the first expression between (). End result is removal of a negative sign in front of a number and wrapping it in parentheses.

So with an input of:

test value: -123.4

the output should be of the form

test value: (123.4)

share|improve this answer

edited 9 mins ago

answered 22 mins ago

Christian Gibbons

261110

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  ...and adds parentheses around the result, too. Just changing the display style.
  – drewbenn
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Ah, yes, I did miss that. I'll edit it in.
  – Christian Gibbons
  12 mins ago
  

  
  
  
  

add a comment | 

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
2
down vote

In GNU sed, it looks for a dash followed by some digits or dots, and replaces that with the same digits in parenthesis. That is, it turns -123.45 into (123.45).

In standard sed, it looks for a dash, a digit or dot, and a plus sign, and then removes the dash and surrounds the rest in parenthesis. That is, it turns -1+ into (1+), but leaves stuff like -123 as-is.

---

Taken apart, in the left-hand pattern, the dash matches itself, [0-9.] matches any one digit or dot, and the ( ) capture the part in between. In the replacement, the parenthesis are literal, and 1 puts back whatever was within the ( ).

In extended regular expressions, a + means "one or more of the previous", so [0-9.]+ would mean "one or more digits or dots". In a standard regex, neither + or + has any special meaning, however, but GNU systems are a bit lax on that, and + takes the "one or more" sense there.

Portably, that should be either

sed -E 's/-([0-9.]+)/(1)/' 

or

sed 's/-([0-9.]1,)/(1)/' 

Both of which will replace a dash in front of a number with parenthesis around it.

share|improve this answer

edited 4 mins ago

answered 10 mins ago

ilkkachu

51.5k678142

add a comment | 

up vote
2
down vote

In GNU sed, it looks for a dash followed by some digits or dots, and replaces that with the same digits in parenthesis. That is, it turns -123.45 into (123.45).

In standard sed, it looks for a dash, a digit or dot, and a plus sign, and then removes the dash and surrounds the rest in parenthesis. That is, it turns -1+ into (1+), but leaves stuff like -123 as-is.

---

Taken apart, in the left-hand pattern, the dash matches itself, [0-9.] matches any one digit or dot, and the ( ) capture the part in between. In the replacement, the parenthesis are literal, and 1 puts back whatever was within the ( ).

In extended regular expressions, a + means "one or more of the previous", so [0-9.]+ would mean "one or more digits or dots". In a standard regex, neither + or + has any special meaning, however, but GNU systems are a bit lax on that, and + takes the "one or more" sense there.

Portably, that should be either

sed -E 's/-([0-9.]+)/(1)/' 

or

sed 's/-([0-9.]1,)/(1)/' 

Both of which will replace a dash in front of a number with parenthesis around it.

share|improve this answer

edited 4 mins ago

answered 10 mins ago

ilkkachu

51.5k678142

add a comment | 

up vote
2
down vote

up vote
2
down vote

In GNU sed, it looks for a dash followed by some digits or dots, and replaces that with the same digits in parenthesis. That is, it turns -123.45 into (123.45).

In standard sed, it looks for a dash, a digit or dot, and a plus sign, and then removes the dash and surrounds the rest in parenthesis. That is, it turns -1+ into (1+), but leaves stuff like -123 as-is.

---

Taken apart, in the left-hand pattern, the dash matches itself, [0-9.] matches any one digit or dot, and the ( ) capture the part in between. In the replacement, the parenthesis are literal, and 1 puts back whatever was within the ( ).

In extended regular expressions, a + means "one or more of the previous", so [0-9.]+ would mean "one or more digits or dots". In a standard regex, neither + or + has any special meaning, however, but GNU systems are a bit lax on that, and + takes the "one or more" sense there.

Portably, that should be either

sed -E 's/-([0-9.]+)/(1)/' 

or

sed 's/-([0-9.]1,)/(1)/' 

Both of which will replace a dash in front of a number with parenthesis around it.

share|improve this answer

edited 4 mins ago

answered 10 mins ago

ilkkachu

51.5k678142

In GNU sed, it looks for a dash followed by some digits or dots, and replaces that with the same digits in parenthesis. That is, it turns -123.45 into (123.45).

In standard sed, it looks for a dash, a digit or dot, and a plus sign, and then removes the dash and surrounds the rest in parenthesis. That is, it turns -1+ into (1+), but leaves stuff like -123 as-is.

---

Taken apart, in the left-hand pattern, the dash matches itself, [0-9.] matches any one digit or dot, and the ( ) capture the part in between. In the replacement, the parenthesis are literal, and 1 puts back whatever was within the ( ).

In extended regular expressions, a + means "one or more of the previous", so [0-9.]+ would mean "one or more digits or dots". In a standard regex, neither + or + has any special meaning, however, but GNU systems are a bit lax on that, and + takes the "one or more" sense there.

Portably, that should be either

sed -E 's/-([0-9.]+)/(1)/' 

or

sed 's/-([0-9.]1,)/(1)/' 

Both of which will replace a dash in front of a number with parenthesis around it.

share|improve this answer

edited 4 mins ago

answered 10 mins ago

ilkkachu

51.5k678142

share|improve this answer

share|improve this answer

edited 4 mins ago

edited 4 mins ago

edited 4 mins ago

answered 10 mins ago

ilkkachu

51.5k678142

answered 10 mins ago

ilkkachu

51.5k678142

answered 10 mins ago

ilkkachu

51.5k678142

51.5k678142

add a comment | 

add a comment | 

up vote
1
down vote

Looks like it changing the format of negative numbers from having a - in front of them to instead being surrounded by parentheses.

It searches for a sequence that starts with - followed by a sequence of numerals and decimals [0-9.] being a match to numerals and decimals, and + modifying it to match one or more such character in a sequence. The sequence of numerals and decimals are inside (...), which is the first expression, and in the replacement clause, (1) will paste the first expression between (). End result is removal of a negative sign in front of a number and wrapping it in parentheses.

So with an input of:

test value: -123.4

the output should be of the form

test value: (123.4)

share|improve this answer

edited 9 mins ago

answered 22 mins ago

Christian Gibbons

261110

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  ...and adds parentheses around the result, too. Just changing the display style.
  – drewbenn
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Ah, yes, I did miss that. I'll edit it in.
  – Christian Gibbons
  12 mins ago
  

  
  
  
  

add a comment | 

up vote
1
down vote

Looks like it changing the format of negative numbers from having a - in front of them to instead being surrounded by parentheses.

It searches for a sequence that starts with - followed by a sequence of numerals and decimals [0-9.] being a match to numerals and decimals, and + modifying it to match one or more such character in a sequence. The sequence of numerals and decimals are inside (...), which is the first expression, and in the replacement clause, (1) will paste the first expression between (). End result is removal of a negative sign in front of a number and wrapping it in parentheses.

So with an input of:

test value: -123.4

the output should be of the form

test value: (123.4)

share|improve this answer

edited 9 mins ago

answered 22 mins ago

Christian Gibbons

261110

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  ...and adds parentheses around the result, too. Just changing the display style.
  – drewbenn
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Ah, yes, I did miss that. I'll edit it in.
  – Christian Gibbons
  12 mins ago
  

  
  
  
  

add a comment | 

up vote
1
down vote

up vote
1
down vote

Looks like it changing the format of negative numbers from having a - in front of them to instead being surrounded by parentheses.

It searches for a sequence that starts with - followed by a sequence of numerals and decimals [0-9.] being a match to numerals and decimals, and + modifying it to match one or more such character in a sequence. The sequence of numerals and decimals are inside (...), which is the first expression, and in the replacement clause, (1) will paste the first expression between (). End result is removal of a negative sign in front of a number and wrapping it in parentheses.

So with an input of:

test value: -123.4

the output should be of the form

test value: (123.4)

share|improve this answer

edited 9 mins ago

answered 22 mins ago

Christian Gibbons

261110

Looks like it changing the format of negative numbers from having a - in front of them to instead being surrounded by parentheses.

It searches for a sequence that starts with - followed by a sequence of numerals and decimals [0-9.] being a match to numerals and decimals, and + modifying it to match one or more such character in a sequence. The sequence of numerals and decimals are inside (...), which is the first expression, and in the replacement clause, (1) will paste the first expression between (). End result is removal of a negative sign in front of a number and wrapping it in parentheses.

So with an input of:

test value: -123.4

the output should be of the form

test value: (123.4)

share|improve this answer

edited 9 mins ago

answered 22 mins ago

Christian Gibbons

261110

share|improve this answer

share|improve this answer

edited 9 mins ago

edited 9 mins ago

edited 9 mins ago

answered 22 mins ago

Christian Gibbons

261110

answered 22 mins ago

Christian Gibbons

261110

answered 22 mins ago

Christian Gibbons

261110

261110

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  ...and adds parentheses around the result, too. Just changing the display style.
  – drewbenn
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Ah, yes, I did miss that. I'll edit it in.
  – Christian Gibbons
  12 mins ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  ...and adds parentheses around the result, too. Just changing the display style.
  – drewbenn
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Ah, yes, I did miss that. I'll edit it in.
  – Christian Gibbons
  12 mins ago
  

  
  
  
  

2

2

...and adds parentheses around the result, too. Just changing the display style.
– drewbenn
13 mins ago

...and adds parentheses around the result, too. Just changing the display style.
– drewbenn
13 mins ago

1

1

Ah, yes, I did miss that. I'll edit it in.
– Christian Gibbons
12 mins ago

Ah, yes, I did miss that. I'll edit it in.
– Christian Gibbons
12 mins ago

add a comment | 

Quincy Darko is a new contributor. Be nice, and check out our Code of Conduct.

 

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