Two methods of shell automatic Interactive processing of commands

1:use ECHO-E

Example

Echo-e "n\np\n1\n\n+100m\nn\np\n2\n\n+1024m\nw\n" |fdisk/dev/vdb

\ n represents a carriage return

[Email protected] ~]# fdisk-l/DEV/VDB

disk/dev/vdb:8589 MB, 8589934592 bytes
Heads, Sectors/track, 16644 cylinders
Units = Cylinders of 1008 * 516096 bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk identifier:0x00000000

Echo-e "n\np\n1\n\n+100m\nn\np\n2\n\n+1024m\nw\n" |fdisk/dev/vdb &>/dev/null

[[email protected] ~]# fdisk-l/dev/vdb

disk/dev/vdb:8589 MB, 8589934592 bytes
Heads, sectors/t Rack, 16644 cylinders
Units = cylinders of 1008 * = 516096 bytes
Sector size (logical/physical): bytes/512 Bytes
I/o size (minimum/optimal): bytes/512 bytes
Disk identifier:0x99657b78

   Device Boot       start         end       blocks   id  System
/dev/vdb1                1         204       102784+  83  Linux
/dev/vdb2              205        2286     1049328   83   Linux
[[email protected] ~]#

Ok

2.expect:

Notice:you should use "Yum install expect" at begining.

  1 #!/usr/bin/expect                                                                                                                                                                  2 spawn  fdisk  /dev/vdb  3 expect command  4 send  "n\r"   5 send  "p\r"   6 send  "1\r"   7 send  "\ r"   8 send  "+100m\r"   9 expect  "Command"  10  11  12 send  "n\r"  13  send  "p\r"  14 send  "2\r"  15 send  "\ r"  16 send  "+1g\r"  17 send  "W\r"  18 expect eof

The two are similar! ~~~~~~~~~~~~

Choose the right one you like and call expect in Bash in the following format

/usr/bin/expect <<-eof
Specific content ~~~~~
Eof

is not very convenient ~ ~-Simple sauce

Two methods of shell automatic Interactive processing of commands