grep 、find 、tree 新发现

[root@localhost tftpboot]# ip address | grep -A 1 " eno16777736"
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:b3:cf:1c brd ff:ff:ff:ff:ff:ff
inet 192.168.159.128/24 brd 192.168.159.255 scope global dynamic eno16777736
valid_lft 1372sec preferred_lft 1372sec

[root@localhost tftpboot]# ip address | grep -A 1 " eno16777736" | sed -n '3p'
inet 192.168.159.128/24 brd 192.168.159.255 scope global dynamic eno16777736

[root@localhost tftpboot]# ip address | grep -A 1 " eno16777736" | sed -n '3p' | awk '{ print $2 }'
192.168.159.128/24

[root@localhost tftpboot]# ifconfig |grep 'inet' | sed -n "1p"
inet 192.168.159.128 netmask 255.255.255.0 broadcast 192.168.159.255

[root@localhost tftpboot]# ifconfig |grep 'inet' | sed -n "1p" | awk '{print $2}'
192.168.159.128

[root@localhost tftpboot]# ifconfig |grep 'inet' | sed -n "1p" | awk '{print $2,$4}'
192.168.159.128 255.255.255.0

grep -E可以多次进行筛选

[root@test ~]# grep -Ev "^#|^$" /etc/ssh/ssh_config
Host *
GSSAPIAuthentication yes
ForwardX11Trusted yes
SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
SendEnv XMODIFIERS
[root@test ~]# grep -v ^# /etc/ssh/ssh_config

Host *
GSSAPIAuthentication yes
ForwardX11Trusted yes
SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
SendEnv XMODIFIERS

maxdepth 发现深度+层数  

prnue 只显示第一层

[root@test ~]# find ./ -maxdepth 1 -type d ! -name "."
./.oracle_jre_usage
./jdk1.8.0_91
./Python-2.7.3
./.ssh
./Python-2.7.9
[root@test ~]# find ./ -type d ! -name "." -prune
./.oracle_jre_usage
./jdk1.8.0_91
./Python-2.7.3
./.ssh
./Python-2.7.9

tree -L 显示的层数 -d 命令的总结 

[root@test ~]# tree -Ld 1
.
├── jdk1.8.0_91
├── Python-2.7.3
└── Python-2.7.9