001、
[root@PC1 test3]# ls
test.txt
[root@PC1 test3]# cat test.txt ## 测试数据
jjjj kkk
gene jjj
dddd yyy
iiii ppp
ffff 999
gene ttt
eeee mmm
aaaa nnn
[root@PC1 test3]# awk 'BEGIN{idx = 0} {ay1[NR] = $0; if($1 == "gene") {idx++; ay2[idx] = NR}} END {for (i in ay2) {print ay1[ay2[i]]; print ay1[ay2[i]+1]}}' test.txt
gene jjj
dddd yyy
gene ttt
eeee mmm
[root@PC1 test3]# awk 'BEGIN{idx = 0} {ay1[NR] = $0; if($1 == "gene") {idx++; ay2[idx] = NR}} END {for (i in ay2) {print ay1[ay2[i]-1]; print ay1[ay2[i]]}}' test.txt
jjjj kkk
gene jjj
ffff 999
gene ttt
标签：字符,test3,txt,idx,awk,linux,gene,ay1,ay2 From： https://www.cnblogs.com/liujiaxin2018/p/17454587.html