shell腳本將幾行輸出合並成一行顯示

shell腳本將幾行輸出合並成一行顯示   shell腳本實現將文件中的幾行輸出合並成一行顯示   現在有一個文件aa.txt ,其實現格式如下，而我想實現的結果是192.168.1.17 down   [root@localhost shell]# cat aa.txt  192.168.1.17 down 192.168.1.103 open 192.168.1.221 open 192.168.1.104 down 192.168.1.175 down 192.168.1.112 open 192.168.1.11 down   [root@localhost shell]# awk '{if (NR%2==0){print $0} else {printf"%s ",$0}}' aa.txt  192.168.1.17 down 192.168.1.103 open 192.168.1.221 open 192.168.1.104 down 192.168.1.175 down 192.168.1.112 open 192.168.1.11 down   或者   [root@localhost shell]# cat aa.txt | awk '{if(NR%2!=0)ORS=" ";else ORS="\n";print}' 192.168.1.17 down 192.168.1.103 open 192.168.1.221 open 192.168.1.104 down 192.168.1.175 down 192.168.1.112 open 192.168.1.11 down   但是如果aa.txt 的內容如果換種形式       #################################################   搞開發的同事讓我把他寫個腳本可以實現ipset.sh  eth0 192.168.1.1 255.255.255.0 192.168.254.254來配置某個網卡的信息   #!/bin/bash hwaddr=`ifconfig |grep HWaddr |awk '{print $5}'` echo "DEVICE=$1 HWADDR=$hwaddr TYPE=Ethernet ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=static IPADDR=$2 NETMASK=$3 GATEWAY=$4" > /etc/sysconfig/network-scripts/ifcfg-$1 service network restart