awk referencing external variables and invoking system command methods

Goal: To bulk transfer files with awk and SCP commands

Prerequisite: First set up the free-secret landing environment between the host (reference: http://www.cnblogs.com/tankaixiong/p/4172942.html)

Implementing the Scripting Method:

1. The port and IP address of each host are recorded in a file, the first column is the host description information, the reference information

Cat33330192.168. 10.11  33331192.168. 20.22  33332192.168. 30.33  33333192.168. 40.44

2. Writing shell scripts

[Email protected] share]#CatScp_all.SH #!/bin/Bashsrc_path='/home/chenzejin/mysql_backup_all.sh'Des_path='/home/chenzejin/mysql_backup_all_from11.sh'awk '{cmd= "scp-p "' "$src _path"'" [email protected]" $ ": "' "$des _path"'";p rint cmd}'/mnt/hgfs/share/Scp_port_ip.txt

Description: The last line with awk to call the host IP and port information, and stitching into a finished SCP command, the script is just print stitching command, to determine the correct stitching command, the print cmd to System (CMD) to complete the execution of the real command .

The debugging information is as follows:

[Email protected] share]#SH-X Scp_all.SH+ Src_path=/home/chenzejin/mysql_backup_all.SH+ DES_PATH=/HOME/CHENZEJIN/MYSQL_BACKUP_ALL_FROM11.SH+awk '{cmd= "scp-p" $ "/home/chenzejin/mysql_backup_all.sh" "[email protected]" $ ":"/home/chenzejin/mysql_backup_ all_from11.sh ";p rint cmd}'/mnt/hgfs/share/Scp_port_ip.txtSCP-p33330/home/chenzejin/mysql_backup_all.SH[Email protected]192.168.10.11:/home/chenzejin/mysql_backup_all_from11.SHSCP-p33331/home/chenzejin/mysql_backup_all.SH[Email protected]192.168.20.22:/home/chenzejin/mysql_backup_all_from11.SHSCP-p33332/home/chenzejin/mysql_backup_all.SH[Email protected]192.168.30.33:/home/chenzejin/mysql_backup_all_from11.SHSCP-p33333/home/chenzejin/mysql_backup_all.SH[Email protected]192.168.40.44:/home/chenzejin/mysql_backup_all_from11.SH

Description: When referencing an external variable using the awk command, it is important to note that the external variable name needs to be referenced in the format "'" $src _path "'", and the domain information in awk is $ ... Wait without any quotation marks included.

Why do you need to use "'" $src _path "'" format to refer to external variables, in fact, the shell in the parsing is from left to match single quotation marks and double quotes, will step by step explain the past, specific can refer to other articles: http://www.cnblogs.com/ Mydomain/archive/2012/09/24/2699467.html

At this point, we have completed our set goals.

awk referencing external variables and invoking system command methods