echo命令是Linux中最基础和最常用的命令，此处对echo命令的常用方法进行总结。
输入：
[root@node1 ~]# echo ifconfig
输出：
ifconfig
输入：
[root@node1 ~]# echo `ifconfig`
输出：
bond0: flags=5443<UP,BROADCAST,RUNNING,PROMISC,MASTER,MULTICAST> mtu 1500 inet 172.16.1.11 netmask 255.255.255.0 broadcast 172.16.1.255 inet6 fe80::379b:2fcf:2a40:4294 prefixlen 64 scopeid 0x20<link> ether f8:75:88:4f:37:c1 txqueuelen 1000 (Ethernet) RX packets 23834607 bytes 3045446631 (2.8 GiB) RX errors 0 dropped 5501762 overruns 0 frame 0 TX packets 11197377 bytes 1908949712 (1.7 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp2s0f0: flags=6467<UP,BROADCAST,RUNNING,PROMISC,SLAVE,MULTICAST> mtu 1500 ether f8:75:88:4f:37:c1 txqueuelen 1000 (Ethernet) RX packets 18238011 bytes 2319807642 (2.1 GiB) RX errors 0 dropped 1 overruns 0 frame 0 TX packets 319792 bytes 40208148 (38.3 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device memory 0x92f00000-92ffffff enp2s0f1: flags=6467<UP,BROADCAST,RUNNING,PROMISC,SLAVE,MULTICAST> mtu 1500 ether f8:75:88:4f:37:c1 txqueuelen 1000 (Ethernet) RX packets 5615052 bytes 734538233 (700.5 MiB) RX errors 0 dropped 1 overruns 0 frame 0 TX packets 10888928 bytes 1869951941 (1.7 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device memory 0x92e00000-92efffff enp2s0f2: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500 ether f8:75:88:4f:37:c3 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device memory 0x92d00000-92dfffff enp2s0f3: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500 ether f8:75:88:4f:37:c4 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device memory 0x92c00000-92cfffff enp4s0f0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500 inet 10.200.101.131 netmask 255.255.255.0 broadcast 10.200.101.255 inet6 fe80::fa75:88ff:fe87:9ba8 prefixlen 64 scopeid 0x20<link> ether f8:75:88:87:9b:a8 txqueuelen 1000 (Ethernet) RX packets 529678037 bytes 158899597018 (147.9 GiB) RX errors 0 dropped 6620845 overruns 0 frame 0 TX packets 400156944 bytes 112065246274 (104.3 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp4s0f1: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500 ether f8:75:88:87:9b:a9 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1 (Local Loopback) RX packets 370521565 bytes 706047283678 (657.5 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 370521565 bytes 706047283678 (657.5 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
输入：
[root@node1 ~]# echo "`ifconfig`"
输出：
bond0: flags=5443<UP,BROADCAST,RUNNING,PROMISC,MASTER,MULTICAST> mtu 1500
inet 172.16.1.11 netmask 255.255.255.0 broadcast 172.16.1.255
inet6 fe80::379b:2fcf:2a40:4294 prefixlen 64 scopeid 0x20<link>
ether f8:75:88:4f:37:c1 txqueuelen 1000 (Ethernet)
RX packets 23836462 bytes 3045681786 (2.8 GiB)
RX errors 0 dropped 5502194 overruns 0 frame 0
TX packets 11198207 bytes 1909044016 (1.7 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp2s0f0: flags=6467<UP,BROADCAST,RUNNING,PROMISC,SLAVE,MULTICAST> mtu 1500
ether f8:75:88:4f:37:c1 txqueuelen 1000 (Ethernet)
RX packets 18239421 bytes 2319984808 (2.1 GiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 319817 bytes 40211248 (38.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0x92f00000-92ffffff
enp2s0f1: flags=6467<UP,BROADCAST,RUNNING,PROMISC,SLAVE,MULTICAST> mtu 1500
ether f8:75:88:4f:37:c1 txqueuelen 1000 (Ethernet)
RX packets 5615497 bytes 734596222 (700.5 MiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 10889733 bytes 1870043145 (1.7 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0x92e00000-92efffff
enp2s0f2: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500
ether f8:75:88:4f:37:c3 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0x92d00000-92dfffff
enp2s0f3: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500
ether f8:75:88:4f:37:c4 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0x92c00000-92cfffff
enp4s0f0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500
inet 10.200.101.131 netmask 255.255.255.0 broadcast 10.200.101.255
inet6 fe80::fa75:88ff:fe87:9ba8 prefixlen 64 scopeid 0x20<link>
ether f8:75:88:87:9b:a8 txqueuelen 1000 (Ethernet)
RX packets 529711971 bytes 158916672735 (148.0 GiB)
RX errors 0 dropped 6621364 overruns 0 frame 0
TX packets 400174659 bytes 112070758401 (104.3 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp4s0f1: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500
ether f8:75:88:87:9b:a9 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 370548991 bytes 706103298390 (657.6 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 370548991 bytes 706103298390 (657.6 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
输入：
[root@node1 cf-monitor]# echo I love bat > cf.txt
输出：
I love bat
输入：
[root@node1 cf-monitor]# echo I love bat too >> cf.txt
输出：
I love bat I love bat too
输入：
echo "\"It is a test\""
输出：
"It is a test"