1、显示paswd文件第9行内容
# sed -n '9p' passwd
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
2、显示passwd文件,9至15行内容
# sed -n '9,15p' passwd
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
saslauth:x:499:76:"Saslauthd user":/var/empty/saslauth:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
haproxy:x:500:500::/home/haproxy:/bin/false
ntp:x:38:38::/etc/ntp:/sbin/nologin
mysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bash
3、显示9与15行内容
# sed -n '9p;15p' passwd
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
mysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bash