Awk 如果两列中的值相同，请选择“当前行”和“上一行”_Awk

Awk 如果两列中的值相同，请选择“当前行”和“上一行”

awk

Awk 如果两列中的值相同，请选择“当前行”和“上一行”,awk,Awk,检查第2列和第3列中的值，如果前一行和当前行（例如第2-3行和第6-7行）中的值相同，则将分隔的行打印为输入文件 1 1 2 35 1 2 3 4 50 1 2 3 4 75 1 4 7 7 85 1 5 8 6 100 1 8 6 9 125 1 4 6 9 200 1 5 3 2 156 2 所需输出 2,3,4,50,1,2,3,4,75,1 8,6,9,125,1,4,6,9,200,1 我试图修改此代码，但没

检查第2列和第3列中的值，如果前一行和当前行（例如第2-3行和第6-7行）中的值相同，则将分隔的行打印为

输入文件

1   1   2 35  1
2   3   4 50  1
2   3   4 75  1
4   7   7 85  1
5   8   6 100 1
8   6   9 125 1
4   6   9 200 1
5   3   2 156 2

所需输出

2,3,4,50,1,2,3,4,75,1
8,6,9,125,1,4,6,9,200,1

我试图修改此代码，但没有修改结果

awk '{$6=$2 $3 - $p2 $p3} $6==0{print p0; print} {p0=$0;p2=p2;p3=$3}'

提前感谢。

更新了您自己的代码及其机制：

$ awk -v OFS=',' '{$1=$1; cK=$2 FS $3} pK==cK{print p0, $0} {pK=cK; p0=$0}' file
2,3,4,50,1,2,3,4,75,1
8,6,9,125,1,4,6,9,200,1

awk '(($2=$2) $3) - (p2 p3)==0{printf "%s", p0; print} {p0=$0;p2=$2;p3=$3}' OFS="," file
2,3,4,50,12,3,4,75,1
8,6,9,125,14,6,9,200,1

但它有潜在的问题，因此最好使用这种简化/改进的方法：

awk '($2=$2) FS $3==cp{print p0,$0} {p0=$0; cp=$2 FS $3}' OFS=, file

如果需要

FS

，请检查下面的注释

代码失败的原因：

连接（空间的作用）的优先级高于负
```
-
```
您使用
```
$6
```
保存要比较的值，然后它成为
```
$0
```
行（最后一列）的一部分您可以将其更改为临时变量名
您有一个输入错误（
```
p2=p2
```
），您使用了
```
$p2
```
和
```
$p3
```
，这意味着获取
```
p2
```
的值并找到相应的列。因此，如果
```
p2==3
```
，那么
```
$p2
```
等于
```
$3
```
您没有设置OFS，因此即使您的代码正常工作，输出也将被
空格分隔
```
print
```
将添加一个尾随换行符
```
\n
```
，因此即使不存在上述问题，您也将得到4行而不是想要的2行输出

更新您自己的代码及其机制：

awk '(($2=$2) $3) - (p2 p3)==0{printf "%s", p0; print} {p0=$0;p2=$2;p3=$3}' OFS="," file
2,3,4,50,12,3,4,75,1
8,6,9,125,14,6,9,200,1

但它有潜在的问题，因此最好使用这种简化/改进的方法：

awk '($2=$2) FS $3==cp{print p0,$0} {p0=$0; cp=$2 FS $3}' OFS=, file

如果需要

FS

，请检查下面的注释

代码失败的原因：

连接（空间的作用）的优先级高于负
```
-
```
您使用
```
$6
```
保存要比较的值，然后它成为
```
$0
```
行（最后一列）的一部分您可以将其更改为临时变量名
您有一个输入错误（
```
p2=p2
```
），您使用了
```
$p2
```
和
```
$p3
```
，这意味着获取
```
p2
```
的值并找到相应的列。因此，如果
```
p2==3
```
，那么
```
$p2
```
等于
```
$3
```
您没有设置OFS，因此即使您的代码正常工作，输出也将被
空格分隔
```
print
```
将添加一个尾随换行符
```
\n
```
，因此即使不存在上述问题，您也将得到4行而不是想要的2行输出

awk 'prev_2nd==$2 && prev_3rd==$3{$1=$1;print prev_line,$0} {prev_2nd=$2;prev_3rd=$3;$1=$1;prev_line=$0}' OFS=,  Input_file

解释：

awk '
prev_2nd==$2 && prev_3rd==$3{     ##Checking if previous lines variable prev_2nd and prev_3rd are having same value as current line 2nd and 3rd field or not, if yes then do following.
  $1=$1                           ##Resetting $1 value of current line to $1 only why because OP needs output field separator as comma and to apply this we need to reset it to its own value.
  print prev_line,$0              ##Printing value of previous line and current line here.
}                                 ##Closing this condition block here.
{
  prev_2nd=$2                     ##Setting current line $2 to prev_2nd variable here.
  prev_3rd=$3                     ##Setting current line $3 to prev_3rd variable here.
  $1=$1                           ##Resetting value of $1 to $1 to make comma in its values applied.
  prev_line=$0                    ##Now setting pre_line value to current line edited one with comma as separator.
}
' OFS=,  Input_file               ##Setting OFS(output field separator) value as comma here and mentioning Input_file name here.

awk 'prev_2nd==$2 && prev_3rd==$3{$1=$1;print prev_line,$0} {prev_2nd=$2;prev_3rd=$3;$1=$1;prev_line=$0}' OFS=,  Input_file

解释：

awk '
prev_2nd==$2 && prev_3rd==$3{     ##Checking if previous lines variable prev_2nd and prev_3rd are having same value as current line 2nd and 3rd field or not, if yes then do following.
  $1=$1                           ##Resetting $1 value of current line to $1 only why because OP needs output field separator as comma and to apply this we need to reset it to its own value.
  print prev_line,$0              ##Printing value of previous line and current line here.
}                                 ##Closing this condition block here.
{
  prev_2nd=$2                     ##Setting current line $2 to prev_2nd variable here.
  prev_3rd=$3                     ##Setting current line $3 to prev_3rd variable here.
  $1=$1                           ##Resetting value of $1 to $1 to make comma in its values applied.
  prev_line=$0                    ##Now setting pre_line value to current line edited one with comma as separator.
}
' OFS=,  Input_file               ##Setting OFS(output field separator) value as comma here and mentioning Input_file name here.

$2fs$3

FS

FS

a bc

ab c

abc

FS

$2 FS$3

FS

a bc

ab c

abc