How to use sed for substituting 2nd column in shell
I have file that looks like this :
1,2,3,4
5,6,7,8
I want to substitute 2rd column containing 6 to 89. The desired output is
1,2,3,4
5,89,7,8
But if I type
index=2
cat file | sed 's/[^,]*/89/'$index
I get
1,89,3,4
5,89,7,8
and if I type
index=2
cat file | sed 's/[^,]6/89/'$index
nothing changes.
Why is it like this? How can I fix this? Thank you.
sed
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
add a comment |
I have file that looks like this :
1,2,3,4
5,6,7,8
I want to substitute 2rd column containing 6 to 89. The desired output is
1,2,3,4
5,89,7,8
But if I type
index=2
cat file | sed 's/[^,]*/89/'$index
I get
1,89,3,4
5,89,7,8
and if I type
index=2
cat file | sed 's/[^,]6/89/'$index
nothing changes.
Why is it like this? How can I fix this? Thank you.
sed
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
1
[^,]matches a single character which is not comma (or newline). It is unclear what you imagine it should match.
– tripleee
Nov 13 '18 at 4:59
Possible duplicate of How to replace second column of csv file with a specific value "XYX"
– tripleee
Nov 13 '18 at 4:59
1
Also, thecatis useless.
– tripleee
Nov 13 '18 at 5:01
1
Possible duplicate of stackoverflow.com/questions/49833671/…
– tripleee
Nov 13 '18 at 5:05
Yes I did not know what [^,] means. Thank you! I don't need to substitute all lines
– Sumin Kim
Nov 13 '18 at 6:02
add a comment |
I have file that looks like this :
1,2,3,4
5,6,7,8
I want to substitute 2rd column containing 6 to 89. The desired output is
1,2,3,4
5,89,7,8
But if I type
index=2
cat file | sed 's/[^,]*/89/'$index
I get
1,89,3,4
5,89,7,8
and if I type
index=2
cat file | sed 's/[^,]6/89/'$index
nothing changes.
Why is it like this? How can I fix this? Thank you.
sed
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
I have file that looks like this :
1,2,3,4
5,6,7,8
I want to substitute 2rd column containing 6 to 89. The desired output is
1,2,3,4
5,89,7,8
But if I type
index=2
cat file | sed 's/[^,]*/89/'$index
I get
1,89,3,4
5,89,7,8
and if I type
index=2
cat file | sed 's/[^,]6/89/'$index
nothing changes.
Why is it like this? How can I fix this? Thank you.
sed
sed
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
asked Nov 13 '18 at 4:55
Sumin KimSumin Kim
1028
1028
1
[^,]matches a single character which is not comma (or newline). It is unclear what you imagine it should match.
– tripleee
Nov 13 '18 at 4:59
Possible duplicate of How to replace second column of csv file with a specific value "XYX"
– tripleee
Nov 13 '18 at 4:59
1
Also, thecatis useless.
– tripleee
Nov 13 '18 at 5:01
1
Possible duplicate of stackoverflow.com/questions/49833671/…
– tripleee
Nov 13 '18 at 5:05
Yes I did not know what [^,] means. Thank you! I don't need to substitute all lines
– Sumin Kim
Nov 13 '18 at 6:02
add a comment |
1
[^,]matches a single character which is not comma (or newline). It is unclear what you imagine it should match.
– tripleee
Nov 13 '18 at 4:59
Possible duplicate of How to replace second column of csv file with a specific value "XYX"
– tripleee
Nov 13 '18 at 4:59
1
Also, thecatis useless.
– tripleee
Nov 13 '18 at 5:01
1
Possible duplicate of stackoverflow.com/questions/49833671/…
– tripleee
Nov 13 '18 at 5:05
Yes I did not know what [^,] means. Thank you! I don't need to substitute all lines
– Sumin Kim
Nov 13 '18 at 6:02
1
1
[^,] matches a single character which is not comma (or newline). It is unclear what you imagine it should match.– tripleee
Nov 13 '18 at 4:59
[^,] matches a single character which is not comma (or newline). It is unclear what you imagine it should match.– tripleee
Nov 13 '18 at 4:59
Possible duplicate of How to replace second column of csv file with a specific value "XYX"
– tripleee
Nov 13 '18 at 4:59
Possible duplicate of How to replace second column of csv file with a specific value "XYX"
– tripleee
Nov 13 '18 at 4:59
1
1
Also, the
cat is useless.– tripleee
Nov 13 '18 at 5:01
Also, the
cat is useless.– tripleee
Nov 13 '18 at 5:01
1
1
Possible duplicate of stackoverflow.com/questions/49833671/…
– tripleee
Nov 13 '18 at 5:05
Possible duplicate of stackoverflow.com/questions/49833671/…
– tripleee
Nov 13 '18 at 5:05
Yes I did not know what [^,] means. Thank you! I don't need to substitute all lines
– Sumin Kim
Nov 13 '18 at 6:02
Yes I did not know what [^,] means. Thank you! I don't need to substitute all lines
– Sumin Kim
Nov 13 '18 at 6:02
add a comment |
2 Answers
2
active
oldest
votes
Since you want to change the second column containing a 6 and you have a comma as field separator it is actually very easy with sed:
sed 's/^([^,]*),6,/1,89,/`
Here we make use of back-referencing to remember the first column.
If you want to replace the 6 in the 5th column, you can do something like:
sed 's/^(([^,]*,)4)6,/189,/'
It is, however, much more comfortable using awk:
awk 'BEGINFS=OFS=","($2==6)$2=891'
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
add a comment |
I solved this by using awk
awk 'BEGINFS=OFS="," if ($2==6) $2=891' file >file1
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
add a comment |
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Since you want to change the second column containing a 6 and you have a comma as field separator it is actually very easy with sed:
sed 's/^([^,]*),6,/1,89,/`
Here we make use of back-referencing to remember the first column.
If you want to replace the 6 in the 5th column, you can do something like:
sed 's/^(([^,]*,)4)6,/189,/'
It is, however, much more comfortable using awk:
awk 'BEGINFS=OFS=","($2==6)$2=891'
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
add a comment |
Since you want to change the second column containing a 6 and you have a comma as field separator it is actually very easy with sed:
sed 's/^([^,]*),6,/1,89,/`
Here we make use of back-referencing to remember the first column.
If you want to replace the 6 in the 5th column, you can do something like:
sed 's/^(([^,]*,)4)6,/189,/'
It is, however, much more comfortable using awk:
awk 'BEGINFS=OFS=","($2==6)$2=891'
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
add a comment |
Since you want to change the second column containing a 6 and you have a comma as field separator it is actually very easy with sed:
sed 's/^([^,]*),6,/1,89,/`
Here we make use of back-referencing to remember the first column.
If you want to replace the 6 in the 5th column, you can do something like:
sed 's/^(([^,]*,)4)6,/189,/'
It is, however, much more comfortable using awk:
awk 'BEGINFS=OFS=","($2==6)$2=891'
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
Since you want to change the second column containing a 6 and you have a comma as field separator it is actually very easy with sed:
sed 's/^([^,]*),6,/1,89,/`
Here we make use of back-referencing to remember the first column.
If you want to replace the 6 in the 5th column, you can do something like:
sed 's/^(([^,]*,)4)6,/189,/'
It is, however, much more comfortable using awk:
awk 'BEGINFS=OFS=","($2==6)$2=891'
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
answered Nov 13 '18 at 11:37
kvantourkvantour
8,37131230
8,37131230
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
add a comment |
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
Thank you very much!
– Sumin Kim
Nov 14 '18 at 9:36
add a comment |
I solved this by using awk
awk 'BEGINFS=OFS="," if ($2==6) $2=891' file >file1
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
add a comment |
I solved this by using awk
awk 'BEGINFS=OFS="," if ($2==6) $2=891' file >file1
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
add a comment |
I solved this by using awk
awk 'BEGINFS=OFS="," if ($2==6) $2=891' file >file1
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
I solved this by using awk
awk 'BEGINFS=OFS="," if ($2==6) $2=891' file >file1
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
answered Nov 13 '18 at 6:03
Sumin KimSumin Kim
1028
1028
add a comment |
add a comment |
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1
[^,]matches a single character which is not comma (or newline). It is unclear what you imagine it should match.– tripleee
Nov 13 '18 at 4:59
Possible duplicate of How to replace second column of csv file with a specific value "XYX"
– tripleee
Nov 13 '18 at 4:59
1
Also, the
catis useless.– tripleee
Nov 13 '18 at 5:01
1
Possible duplicate of stackoverflow.com/questions/49833671/…
– tripleee
Nov 13 '18 at 5:05
Yes I did not know what [^,] means. Thank you! I don't need to substitute all lines
– Sumin Kim
Nov 13 '18 at 6:02