Awk匹配TSV列，并用bash中的前缀替换所有行 [英] Awk Match a TSV column and replace all rows with a prefix in bash

问题描述

我有以下格式的TSV文件:

I have a TSV file with the following format:

HAPPY    today I feel good
SAD    this is a bad day
UPSET     Hey please leave me alone!

我必须用__label__之类的前缀替换第一列的值加上我要降低的值，以便将其作为输出

I have to replace the first column value with a prefix like __label__ plus my value to lower, so that to have as output

__label__happy     today I feel good
__label__sad     this is a bad day
__label__upset     Hey please leave me alone!

在外壳中(使用awk，sed)等

推荐答案

awk 'BEGIN{FS=OFS="\t"}{ $1 = "__label__" tolower($1) }1' infile

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