1、测试数据
[root@centos79 test]# cat a.txt 01 3 4 02 f s 03 t 3 04 s d 05 g i 06 y e 07 a w 08 d g 09 e w 10 n u 11 7 8 12 3 s 13 a d 14 g e 15 w a 16 z v 17 n m 18 k p
2、提取 3,5,7,8,9,15,17行
使用sed
[root@centos79 test]# ls a.txt lines [root@centos79 test]# cat lines 3 5 7 8 9 15 17 [root@centos79 test]# cat a.txt 01 3 4 02 f s 03 t 3 04 s d 05 g i 06 y e 07 a w 08 d g 09 e w 10 n u 11 7 8 12 3 s 13 a d 14 g e 15 w a 16 z v 17 n m 18 k p [root@centos79 test]# for i in `cat lines`; do sed -n "$i"p a.txt >> result; done [root@centos79 test]# ls a.txt lines result [root@centos79 test]# cat result 03 t 3 05 g i 07 a w 08 d g 09 e w 15 w a 17 n m
使用awk
[root@centos79 test]# ls a.txt lines [root@centos79 test]# cat a.txt 01 3 4 02 f s 03 t 3 04 s d 05 g i 06 y e 07 a w 08 d g 09 e w 10 n u 11 7 8 12 3 s 13 a d 14 g e 15 w a 16 z v 17 n m 18 k p [root@centos79 test]# cat lines 3 5 7 8 9 15 17 [root@centos79 test]# for i in $(cat lines ); do awk -v a=$i 'NR == a' a.txt >> result; done [root@centos79 test]# cat result 03 t 3 05 g i 07 a w 08 d g 09 e w 15 w a 17 n m
使用while语句:
[root@centos79 test]# ls a.txt lines [root@centos79 test]# cat a.txt 01 3 4 02 f s 03 t 3 04 s d 05 g i 06 y e 07 a w 08 d g 09 e w 10 n u 11 7 8 12 3 s 13 a d 14 g e 15 w a 16 z v 17 n m 18 k p [root@centos79 test]# cat lines 3 5 7 8 9 15 17 [root@centos79 test]# cat lines | while read i; do sed -n "$i"p a.txt >> result; done [root@centos79 test]# cat result 03 t 3 05 g i 07 a w 08 d g 09 e w 15 w a 17 n m
while + awk
[root@centos79 test]# ls a.txt lines [root@centos79 test]# cat a.txt 01 3 4 02 f s 03 t 3 04 s d 05 g i 06 y e 07 a w 08 d g 09 e w 10 n u 11 7 8 12 3 s 13 a d 14 g e 15 w a 16 z v 17 n m 18 k p [root@centos79 test]# cat lines 3 5 7 8 9 15 17 [root@centos79 test]# cat lines | while read i; do awk -v a=$i 'NR == a' a.txt >> result; done [root@centos79 test]# cat result 03 t 3 05 g i 07 a w 08 d g 09 e w 15 w a 17 n m