Using NF with FPAT – what am I doing wrong?
I'm trying to figure out, and to learn AWK, why, when NF is used with FPAT regex, the comma is considered a field. I prefer using NF and FPAT:
1) NF – to limit the output to the actual number of fields for the record
2) FPAT – to handle an embedded comma in a quoted field like line 3:
"Bus Driver, City/Transit",51
3) the awk script is used for several input files that have a different number of columns for record 6 - record 6 is the column name/header for the contents of the file...
The output from testing, the first, test1, uses a fixed value for number of fields, the second, test2, uses NF for the number of fields.
I've been using this script to experiment with some ideas/concepts - I'm not well versed with AWK so I'm trying to learn...
thank you - any help is much appreciated
using gawk 4.1.4
BEGIN {
FPAT = "(^,)|([^,]+)|("[^"]+")"
OFS = "t"
}
NR == 6 {
for (i = 1; 6 >= i; ++i) {
#for (i = 1; NF >= i; ++i) {
colName[i] = $i
print "Column Name: " colName[i]
}
{ print "", "number of fields: " NF }
}
Input File starting at record 6: NR == 6 {...
Occupation,States Licensed
Barber,51
"Bus Driver, City/Transit",51
The output I expect/want:
Column Name: Occupation
Column Name: States Licensed
number of fields: 2
test 1: for (i = 1; 6 >= i; ++i) {...
output is correct - what I expect/want, except, of course, for the 4 columns/fields that are not valid but are shown because of using a fixed value of 6.
Column Name: Occupation
Column Name: States Licensed
Column Name:
Column Name:
Column Name:
Column Name:
number of fields: 2
test 2: for (i = 1; NF >= i; ++i) {...
output is NOT what I expect/want; note the comma is a indicate as a field
Column Name: Occupation
Column Name: ,
Column Name: States Licensed
number of fields: 3
text-processing awk csv gawk
edited 2 hours ago
G-Man
13.2k93566
asked 2 hours ago
TomMTomM
62
New contributor
TomM 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'm trying to figure out, and to learn AWK, why, when NF is used with FPAT regex, the comma is considered a field. I prefer using NF and FPAT:
1) NF – to limit the output to the actual number of fields for the record
2) FPAT – to handle an embedded comma in a quoted field like line 3:
"Bus Driver, City/Transit",51
3) the awk script is used for several input files that have a different number of columns for record 6 - record 6 is the column name/header for the contents of the file...
The output from testing, the first, test1, uses a fixed value for number of fields, the second, test2, uses NF for the number of fields.
I've been using this script to experiment with some ideas/concepts - I'm not well versed with AWK so I'm trying to learn...
thank you - any help is much appreciated
using gawk 4.1.4
BEGIN {
FPAT = "(^,)|([^,]+)|("[^"]+")"
OFS = "t"
}
NR == 6 {
for (i = 1; 6 >= i; ++i) {
#for (i = 1; NF >= i; ++i) {
colName[i] = $i
print "Column Name: " colName[i]
}
{ print "", "number of fields: " NF }
}
Input File starting at record 6: NR == 6 {...
Occupation,States Licensed
Barber,51
"Bus Driver, City/Transit",51
The output I expect/want:
Column Name: Occupation
Column Name: States Licensed
number of fields: 2
test 1: for (i = 1; 6 >= i; ++i) {...
output is correct - what I expect/want, except, of course, for the 4 columns/fields that are not valid but are shown because of using a fixed value of 6.
Column Name: Occupation
Column Name: States Licensed
Column Name:
Column Name:
Column Name:
Column Name:
number of fields: 2
test 2: for (i = 1; NF >= i; ++i) {...
output is NOT what I expect/want; note the comma is a indicate as a field
Column Name: Occupation
Column Name: ,
Column Name: States Licensed
number of fields: 3
text-processing awk csv gawk
edited 2 hours ago
G-Man
13.2k93566
asked 2 hours ago
TomMTomM
62
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The problem is your regex I think - tryFPAT = ""[^"]*"|[^",]*"(a possibly empty sequence of non-quotes surrounded by quotes, or a possibly empty sequence of not-comma-or-quotes). Or more readablygawk -v FPAT='"[^"]*"|[^",]*' '<stuff>'
– steeldriver
47 mins ago
add a comment |
I'm trying to figure out, and to learn AWK, why, when NF is used with FPAT regex, the comma is considered a field. I prefer using NF and FPAT:
1) NF – to limit the output to the actual number of fields for the record
2) FPAT – to handle an embedded comma in a quoted field like line 3:
"Bus Driver, City/Transit",51
3) the awk script is used for several input files that have a different number of columns for record 6 - record 6 is the column name/header for the contents of the file...
The output from testing, the first, test1, uses a fixed value for number of fields, the second, test2, uses NF for the number of fields.
I've been using this script to experiment with some ideas/concepts - I'm not well versed with AWK so I'm trying to learn...
thank you - any help is much appreciated
using gawk 4.1.4
BEGIN {
FPAT = "(^,)|([^,]+)|("[^"]+")"
OFS = "t"
}
NR == 6 {
for (i = 1; 6 >= i; ++i) {
#for (i = 1; NF >= i; ++i) {
colName[i] = $i
print "Column Name: " colName[i]
}
{ print "", "number of fields: " NF }
}
Input File starting at record 6: NR == 6 {...
Occupation,States Licensed
Barber,51
"Bus Driver, City/Transit",51
The output I expect/want:
Column Name: Occupation
Column Name: States Licensed
number of fields: 2
test 1: for (i = 1; 6 >= i; ++i) {...
output is correct - what I expect/want, except, of course, for the 4 columns/fields that are not valid but are shown because of using a fixed value of 6.
Column Name: Occupation
Column Name: States Licensed
Column Name:
Column Name:
Column Name:
Column Name:
number of fields: 2
test 2: for (i = 1; NF >= i; ++i) {...
output is NOT what I expect/want; note the comma is a indicate as a field
Column Name: Occupation
Column Name: ,
Column Name: States Licensed
number of fields: 3
text-processing awk csv gawk
edited 2 hours ago
G-Man
13.2k93566
asked 2 hours ago
TomMTomM
62
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm trying to figure out, and to learn AWK, why, when NF is used with FPAT regex, the comma is considered a field. I prefer using NF and FPAT:
1) NF – to limit the output to the actual number of fields for the record
2) FPAT – to handle an embedded comma in a quoted field like line 3:
"Bus Driver, City/Transit",51
3) the awk script is used for several input files that have a different number of columns for record 6 - record 6 is the column name/header for the contents of the file...
The output from testing, the first, test1, uses a fixed value for number of fields, the second, test2, uses NF for the number of fields.
I've been using this script to experiment with some ideas/concepts - I'm not well versed with AWK so I'm trying to learn...
thank you - any help is much appreciated
using gawk 4.1.4
BEGIN {
FPAT = "(^,)|([^,]+)|("[^"]+")"
OFS = "t"
}
NR == 6 {
for (i = 1; 6 >= i; ++i) {
#for (i = 1; NF >= i; ++i) {
colName[i] = $i
print "Column Name: " colName[i]
}
{ print "", "number of fields: " NF }
}
Input File starting at record 6: NR == 6 {...
Occupation,States Licensed
Barber,51
"Bus Driver, City/Transit",51
The output I expect/want:
Column Name: Occupation
Column Name: States Licensed
number of fields: 2
test 1: for (i = 1; 6 >= i; ++i) {...
output is correct - what I expect/want, except, of course, for the 4 columns/fields that are not valid but are shown because of using a fixed value of 6.
Column Name: Occupation
Column Name: States Licensed
Column Name:
Column Name:
Column Name:
Column Name:
number of fields: 2
test 2: for (i = 1; NF >= i; ++i) {...
output is NOT what I expect/want; note the comma is a indicate as a field
Column Name: Occupation
Column Name: ,
Column Name: States Licensed
number of fields: 3
text-processing awk csv gawk
text-processing awk csv gawk
edited 2 hours ago
G-Man
13.2k93566
asked 2 hours ago
TomMTomM
62
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
G-Man
13.2k93566
asked 2 hours ago
TomMTomM
62
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
G-Man
13.2k93566
edited 2 hours ago
G-Man
13.2k93566
edited 2 hours ago
G-Man
13.2k93566
13.2k93566
asked 2 hours ago
TomMTomM
62
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
TomMTomM
62
asked 2 hours ago
TomMTomM
62
62
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
TomM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The problem is your regex I think - tryFPAT = ""[^"]*"|[^",]*"(a possibly empty sequence of non-quotes surrounded by quotes, or a possibly empty sequence of not-comma-or-quotes). Or more readablygawk -v FPAT='"[^"]*"|[^",]*' '<stuff>'
– steeldriver
47 mins ago
add a comment |
The problem is your regex I think - tryFPAT = ""[^"]*"|[^",]*"(a possibly empty sequence of non-quotes surrounded by quotes, or a possibly empty sequence of not-comma-or-quotes). Or more readablygawk -v FPAT='"[^"]*"|[^",]*' '<stuff>'
– steeldriver
47 mins ago
The problem is your regex I think - try
FPAT = ""[^"]*"|[^",]*" (a possibly empty sequence of non-quotes surrounded by quotes, or a possibly empty sequence of not-comma-or-quotes). Or more readably gawk -v FPAT='"[^"]*"|[^",]*' '<stuff>'– steeldriver
47 mins ago
The problem is your regex I think - try
FPAT = ""[^"]*"|[^",]*" (a possibly empty sequence of non-quotes surrounded by quotes, or a possibly empty sequence of not-comma-or-quotes). Or more readably gawk -v FPAT='"[^"]*"|[^",]*' '<stuff>'– steeldriver
47 mins ago
add a comment |
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The problem is your regex I think - try
FPAT = ""[^"]*"|[^",]*"(a possibly empty sequence of non-quotes surrounded by quotes, or a possibly empty sequence of not-comma-or-quotes). Or more readablygawk -v FPAT='"[^"]*"|[^",]*' '<stuff>'– steeldriver
47 mins ago