awk 中 \n 的意思

81358458

[root@shpdl380prx2 nm308]# cat data2
Riley Mullen
123 Main Street
Chicago, IT 60601
(312)555-1234

Frank Williams
456 Oak Street
Indianapolis, IN 46201
(317)555-9876

Haley Snell
4231 Elm Street
Detroit, MI 48201
(313)555-4938
[root@shpdl380prx2 nm308]# awk 'BEGIN{FS="\n";RS=""} {printf "%-16s %s\n", $1, $4}' data2

这里为什么要写成 FS="\n" RS=""

不知道有哪位高人知道

MaskRay

RS 为空字符串表明以空行为 records 分隔符，换行为 fields 分隔符

bchbch

If you try to read this data using the default FS and RS variable values, gawk will read each line
as a separate record, and interpret each space in the record as a field separator. This isn’t what
you intended.
To solve this problem, you need to set the FS variable to the newline character. This indicates
that each line in the data stream is a separate field and all of the data on a line belongs to the
data field. However, now you have the problem of not knowing where a new record starts.
To solve this problem, set the RS variable to an empty string, then leave a blank line between data
records in the data stream. The gawk program will interpret each blank line as a record separator.