awk打印匹配行,如果不匹配,则打印“未知”

awk file1 到排队 file2 . 如果两个文件之间未找到匹配项 $1 文件1 然后 unknown 我在 else next . 我不知道为什么语法错误作为 其他的 未知的 条件和 告诉 处理下一行,对吗?还是我的想法错了?两个文件都是 space-delimited

文件1

A2M
A4GALT
A4GNT
ABC34

文件2

A2M AD
ABC34 AD/AR

A2M AD
A4GALT unknown
A4GNT unknown
ABC34 AD/AR

awk公司

awk 'NR==FNR{A[$1];next}$1 in A else { print "unknown" }' file1 file2

awk 'BEGIN{FS=OFS="\t"}  # define field and output seperators
    FNR==NR{ # process each field in line of `file1`
         for (i=1; i <= n; i++) {   # execute loop
         d[$1] = $1  # match first element and read into key d
  }
}
  next   # process next line
}{print $1, ($1 in d?d[$1]:"unknown")}' file1 file2 # if no match 
print $1 followed by unknown