Question

我正在尝试使用awk有条件地从csv打印出行的子集，并且标题并不总是被打印出来（如果它始终没有打印出来会更好，但行为会有所不同）。< / p>

E.g：

$ cat faults_main_dp_1_faultDate.csv | parallel -k -q --block 100M --pipe awk -F , '$299 > 30 {print $1 "," $5 "," $6 "," $7 "," $299}' | head | csvlook
|-------------+-------------------+---------------------+----------------------+---------------------|
|  faultDate  | assetId           | faultActiveTime     | faultActiveLatitude  | ambienf             |
|-------------+-------------------+---------------------+----------------------+---------------------|
|  2015-03-08 | LOCOMOTIVE_ALL618 | 2015-03-08T10:52:40 | -0.40950949999999997 | 31.334039688110398  |
|  2015-03-07 | LOCOMOTIVE_ALL618 | 2015-03-07T15:34:16 | -0.3867394           | 32.2283515930176    |
|  2015-03-07 | LOCOMOTIVE_ALL619 | 2015-03-07T17:42:19 | -0.380149841         | 32.7088813781738    |
|  2015-03-06 | LOCOMOTIVE_ALL618 | 2015-03-06T15:33:15 | -0.354323447         | 33.337738037109396  |
|  2015-03-05 | LOCOMOTIVE_ALL618 | 2015-03-05T17:38:20 | -0.31172340000000004 | 32.225231170654304  |
|  2015-03-05 | LOCOMOTIVE_ALL618 | 2015-03-05T15:24:19 | -0.302686065         | 30.0030345916748    |
|  2015-04-20 | LOCOMOTIVE_ALL622 | 2015-04-20T19:41:22 | -0.379977226         | 31.8880805969238    |
|  2015-04-18 | LOCOMOTIVE_ALL618 | 2015-04-18T06:59:32 | -0.38011753600000003 | 31.6899147033691    |
|  2015-04-09 | LOCOMOTIVE_ALL623 | 2015-04-09T18:38:09 | -0.383524776         | 31.0484771728516    |
|-------------+-------------------+---------------------+----------------------+——————————|

可是：

$ cat faults_main_dp_1_faultDate.csv | parallel -k -q --block 100M --pipe awk -F , '$1 < "2014-03-01" {print $1 "," $5 "," $7 "," $299}' | head -n 5 | csvlook
|-------------+-------------------+----------------------+---------------------|
|  2014-02-28 | LOCOMOTIVE_ALL619 | -0.369633675         |                     |
|-------------+-------------------+----------------------+---------------------|
|  2014-02-28 | LOCOMOTIVE_ALL619 | -0.375370562         |                     |
|  2014-02-28 | LOCOMOTIVE_ALL620 | -0.291365266         | 23.3389568328857    |
|  2014-02-27 | LOCOMOTIVE_ALL618 | -0.38014966200000005 | 30.008481979370103  |
|  2014-02-27 | LOCOMOTIVE_ALL618 | -0.38014966200000005 | 31.7841949462891    |
|-------------+-------------------+----------------------+——————————|

或：

$ cat faults_main_dp_1_faultDate.csv | parallel -k -q --block 100M --pipe awk -F , '$5 == "LOCOMOTIVE_ALL623" {print $1 "," $5 "," $7 "," $299}' | tail | csvlook

|-------------+-------------------+----------------------+-------------------|
|  2015-07-09 | LOCOMOTIVE_ALL623 | -0.30150732399999997 | 25.9456386566162  |
|-------------+-------------------+----------------------+-------------------|
|  2015-06-14 | LOCOMOTIVE_ALL623 | -0.3295847           | 34.0456199645996  |
|  2014-08-13 | LOCOMOTIVE_ALL623 | -0.41220685799999995 |                   |
|  2014-10-20 | LOCOMOTIVE_ALL623 | -0.415138245         |                   |
|  2015-08-21 | LOCOMOTIVE_ALL623 | -0.38848757700000003 | 30.0110931396484  |
|  2015-08-25 | LOCOMOTIVE_ALL623 | -0.41773062899999996 |                   |
|  2015-04-21 | LOCOMOTIVE_ALL623 | -0.4055466           | 36.1775779724121  |
|  2014-02-18 | LOCOMOTIVE_ALL623 | -0.418272376         |                   |
|  2013-12-24 | LOCOMOTIVE_ALL623 | -0.3781222           | 21.1109352111816  |
|  2015-03-13 | LOCOMOTIVE_ALL623 | -0.35584770000000004 |                   |
|-------------+-------------------+----------------------+-------------------|

Answer 1

所有条件都适用于所有行，如果不满意，则不会在输出中看到标题。但是，你可以这样做，

awk -F, 'NR==1{print;next}  your condition here{your action here}'

这将打印没有任何条件的第一行，并使用您现有的条件{action}移动到下一行。如果您不需要完整标题行但需要某些字段，则还需要指定它们。

awk -F, -vOFS=, 'NR==1{print $1,$5,$7,$299;next}  your condition here{your action here}'

awk并不总是打印出标题

1 个答案: