如何使用AWK或Sed在x个单词之后插入换行符\\ n

Question

我在一行中有这个：

We were born in the earth beyond the land

我希望它在3个单词行中，如下所示：

We were born
in the earth 
beyond the land

Answer 1

$ xargs -n3 < file
We were born
in the earth
beyond the land

$ egrep -o '\S+\s+\S+\s+\S+' file 
We were born
in the earth
beyond the land

Answer 2

使用awk ：

awk '{ 
    for ( i = 1; i <= NF; i++ ) { 
        printf "%s%c", $i, (i % 3 == 0) ? ORS : OFS 
    } 
}' infile

它产生：

We were born
in the earth
beyond the land

Answer 3

使用GNU sed：

sed 's/\(\w\w*\W*\w\w*\W*\w\w*\W*\)/\1\n/g' input

和短版本：

sed 's/\(\(\w\w*\W*\)\{3\}\)/\1\n/g' input

Answer 4

这是一个sed解决方案：

sed -e 's/\s/\n/3;s/\s/\n/6;s/\s/\n/9'

它用换行符替换第三，第六和第九空格。

这个将处理更长的行，即使它们不是三个单词的倍数：

sed -e 's/\(\(\S\{1,\}\s*\)\{3\}\)/\1\n/g'

Answer 5

任何有awk和sed的系统几乎肯定都会有Perl：

 cat myfile.txt | perl -lane 'while(($a,$b,$c) = splice(@F,0,3)){print "$a $b $c"}'