awk replace value in colunm p row i by value in same column next row
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, , price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I want to replace the value in the 1 row, 2nd column of this file by the value in the 2nd row 2nd column. So I'm looking to have awk return this:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I cannot find how to reference the next line in awk:
cat example_file.txt | awk -F, 'BEGIN { OFS = FS } { if (NR==1) $2 = ??}'
awk
asked 7 hours ago
user2413user2413
3,936133962
add a comment |
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, , price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I want to replace the value in the 1 row, 2nd column of this file by the value in the 2nd row 2nd column. So I'm looking to have awk return this:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I cannot find how to reference the next line in awk:
cat example_file.txt | awk -F, 'BEGIN { OFS = FS } { if (NR==1) $2 = ??}'
awk
asked 7 hours ago
user2413user2413
3,936133962
add a comment |
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, , price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I want to replace the value in the 1 row, 2nd column of this file by the value in the 2nd row 2nd column. So I'm looking to have awk return this:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I cannot find how to reference the next line in awk:
cat example_file.txt | awk -F, 'BEGIN { OFS = FS } { if (NR==1) $2 = ??}'
awk
asked 7 hours ago
user2413user2413
3,936133962
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, , price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I want to replace the value in the 1 row, 2nd column of this file by the value in the 2nd row 2nd column. So I'm looking to have awk return this:
#!/usr/bin/env bash
cat > example_file.txt <<EOL
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
EOL
I cannot find how to reference the next line in awk:
cat example_file.txt | awk -F, 'BEGIN { OFS = FS } { if (NR==1) $2 = ??}'
awk
awk
asked 7 hours ago
user2413user2413
3,936133962
asked 7 hours ago
user2413user2413
3,936133962
edited 7 hours ago
user2413
asked 7 hours ago
user2413user2413
3,936133962
asked 7 hours ago
user2413user2413
3,936133962
asked 7 hours ago
user2413user2413
3,936133962
3,936133962
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can use getline to get the next line of input, and split to split it into an array of fields using the current FS:
$ awk -F, 'BEGIN { OFS = FS } NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]} 1' example_file.txt
group, value, price
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
If you want to print the "got" line as well, it's still in ln after splitting (to get the order right, we also need to explicitly print first, and skip the default print using next):
$ awk -F, '
BEGIN { OFS = FS }
NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]; print; print ln; next} 1
' example_file.txt
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use getline to get the next line of input, and split to split it into an array of fields using the current FS:
$ awk -F, 'BEGIN { OFS = FS } NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]} 1' example_file.txt
group, value, price
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
If you want to print the "got" line as well, it's still in ln after splitting (to get the order right, we also need to explicitly print first, and skip the default print using next):
$ awk -F, '
BEGIN { OFS = FS }
NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]; print; print ln; next} 1
' example_file.txt
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
add a comment |
You can use getline to get the next line of input, and split to split it into an array of fields using the current FS:
$ awk -F, 'BEGIN { OFS = FS } NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]} 1' example_file.txt
group, value, price
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
If you want to print the "got" line as well, it's still in ln after splitting (to get the order right, we also need to explicitly print first, and skip the default print using next):
$ awk -F, '
BEGIN { OFS = FS }
NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]; print; print ln; next} 1
' example_file.txt
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
add a comment |
You can use getline to get the next line of input, and split to split it into an array of fields using the current FS:
$ awk -F, 'BEGIN { OFS = FS } NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]} 1' example_file.txt
group, value, price
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
If you want to print the "got" line as well, it's still in ln after splitting (to get the order right, we also need to explicitly print first, and skip the default print using next):
$ awk -F, '
BEGIN { OFS = FS }
NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]; print; print ln; next} 1
' example_file.txt
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
You can use getline to get the next line of input, and split to split it into an array of fields using the current FS:
$ awk -F, 'BEGIN { OFS = FS } NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]} 1' example_file.txt
group, value, price
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
If you want to print the "got" line as well, it's still in ln after splitting (to get the order right, we also need to explicitly print first, and skip the default print using next):
$ awk -F, '
BEGIN { OFS = FS }
NR==1 && (getline ln) > 0 { split(ln,a); $2 = a[2]; print; print ln; next} 1
' example_file.txt
group, value, price
1, value, 3.21
1, 3.42, 4.11
1, 3.5, 1.22
2, 4.1, 9.2
2, 4.2, 2.11
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
edited 7 hours ago
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
answered 7 hours ago
steeldriversteeldriver
66.3k11106179
66.3k11106179
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
add a comment |
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
sorry, I meant for the second line to stay as it was (just the value of one particular cell of it being copied one line up). Editing the question now to make this clear
– user2413
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
@user2413 please see amended answer
– steeldriver
7 hours ago
add a comment |
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