1、测试数据
[root@centos7 test4]# ls test.txt [root@centos7 test4]# cat test.txt e f j d i x a d g c F w
2、grep 实现
[root@centos7 test4]# ls test.txt [root@centos7 test4]# cat test.txt e f j d i x a d g c F w [root@centos7 test4]# grep -n "d" test.txt ## 输出匹配d的行号 2:d i x 3:a d g
3、sed实现
[root@centos7 test4]# ls test.txt [root@centos7 test4]# cat test.txt e f j d i x a d g c F w [root@centos7 test4]# sed -n '/d/=' test.txt ## 输出匹配d的行号 2 3
4、awk实现
[root@centos7 test4]# ls test.txt [root@centos7 test4]# cat test.txt e f j d i x a d g c F w [root@centos7 test4]# awk '$0 ~ /d/ {print NR}' test.txt ## 输出匹配d的行号 2 3