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regex - 根据另一列的值填充 CSV 列

问题描述

在 Bash 脚本中，我想根据另一列（第 1 列）的值填充一个当前为空的列（第 5 列）。

我想我可以使用awk它来达到预期的结果，但我遇到了语法问题：

awk -F, '
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_f_[0-9]{3}[a-z]\.tif$/{$5="Text"}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_[a-b]_[0-9]{1,3}[a-z]?\.tif$/{$5="Front matter"}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_y_[0-9]{1,3}[a-z]?\.tif$/{$5="Back matter"}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_z_1[a-z]?\.tif$/{$5="Back matter"}
' file.csv

我的输入如下所示：

File Name,Item Sequence,Visibility,Title
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0001_a_1.tif,1,discovery,Front Board Outside
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0002_a_1a.tif,2,discovery,Front Board Outside
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0003_b_000.tif,3,discovery,Front Board Inside
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0009_b_003v.tif,9,discovery,Flyleaf 003v
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0010_f_001r.tif,10,discovery,f. 001r
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0060_y_001r.tif,60,discovery,Flyleaf 001r
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0070_y_999.tif,70,discovery,Back Board Inside
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0071_z_1.tif,71,discovery,Back Board Outside
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0072_z_1a.tif,72,discovery,Back Board Outside
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0073_z_2.tif,73,discovery,Spine
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0074_z_3.tif,74,discovery,Fore edge

所需结果应如下所示，其中第五列 ( IIIF Range) 已由我根据第 1 列 ( ) 的值在上面分配的值 ( Front matter、Text、Back matter和空白)填充File Name：

File Name,Item Sequence,Visibility,Title,IIIF Range
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0001_a_1.tif,1,discovery,Front Board Outside,Front matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0002_a_1a.tif,2,discovery,Front Board Outside,Front matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0003_b_000.tif,3,discovery,Front Board Inside,Front matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0009_b_003v.tif,9,discovery,Flyleaf 003v,Front matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0010_f_001r.tif,10,discovery,f. 001r,Text
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0060_y_001r.tif,60,discovery,Flyleaf 001r,Back matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0070_y_999.tif,70,discovery,Back Board Inside,Back matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0071_z_1.tif,71,discovery,Back Board Outside,Back matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0072_z_1a.tif,72,discovery,Back Board Outside,Back matter
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0073_z_2.tif,73,discovery,Spine,,  
Masters/sinaimasters/ara/arabic_0695/sld_arb0695_0074_z_3.tif,74,discovery,Fore edge,,

标签： regexbashcsvawk

解决方案

您可以使用~运算符将​​字符串与正则表达式模式匹配：

awk -F, 'BEGIN{OFS=","}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_f_[0-9]{3}[a-z]\.tif$/{$5="Text"}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_[a-b]_[0-9]{1,3}[a-z]?\.tif$/{$5="Front matter"}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_y_[0-9]{1,3}[a-z]?\.tif$/{$5="Back matter"}
$1~/sld_[a-z]{3}[0-9]{4}_[0-9]{4}_z_1[a-z]?\.tif$/{$5="Back matter"}
1' file.csv

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