1:位置定位
[root@centos-fuwenchao tmp]# sed '1,3p' num.txt
1
1
2
2
3
3
4
5
6
7
8
[root@centos-fuwenchao tmp]# sed -n '1,3p' num.txt
1
2
3
[root@centos-fuwenchao tmp]# sed -n '1,3s/$/asv' num.txt
sed: -e expression #1, char 10: unterminated `s' command
[root@centos-fuwenchao tmp]# sed -n '1,3s/$/asv/' num.txt
[root@centos-fuwenchao tmp]# sed '1,3s/$/asv/' num.txt
1asv
2asv
3asv
4
5
6
7
8
[root@centos-fuwenchao tmp]# sed '1,3s/$/asv/;p' num.txt
1asv
1asv
2asv
2asv
3asv
3asv
4
4
5
5
6
6
7
7
8
8
[root@centos-fuwenchao tmp]# sed -n '1,3s/$/asv/;p' num.txt
1asv
2asv
3asv
4
5
6
7
8
[root@centos-fuwenchao tmp]# sed -n '1,3/1/s/$/asv/;p' num.txt
sed: -e expression #1, char 4: unknown command: `/'
[root@centos-fuwenchao tmp]# sed -n '1,3/1/;s/$/asv/;p' num.txt
sed: -e expression #1, char 4: unknown command: `/'
[root@centos-fuwenchao tmp]# sed -n '1,3s/$/asv/p' num.txt
1asv
2asv
3asv
[root@centos-fuwenchao tmp]# sed -n '1,3s/$/asv/;/1/p' num.txt
1asv
[root@centos-fuwenchao tmp]#
[root@centos-fuwenchao tmp]# sed '1,3s/$/asv/p' num.txt
1asv
1asv
2asv
2asv
3asv
3asv
4
5
6
7
8
[root@centos-fuwenchao tmp]#