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Top Forums UNIX for Dummies Questions & Answers shell script parsing with sed Post 302150407 by jjamd64 on Tuesday 11th of December 2007 10:38:06 AM
Old 12-11-2007
Question shell script parsing with sed

#I'm quite new to scripting and my boss has asked me to solve a simple problem and sadly, I can't figure out how to do it. Any help is appreciated.
Smilie

#The following is a small shell script and the output that it produces for google.com.

#!/bin/sh
whois $1 | grep "Name Server"
dig +short $1 mx
dig +short mail.$1

[jjamd64@localhost ~]$ ./dn.sh google.com
Name Server: NS1.GOOGLE.COM
Name Server: NS2.GOOGLE.COM
Name Server: NS3.GOOGLE.COM
Name Server: NS4.GOOGLE.COM
10 smtp3.google.com.
10 smtp4.google.com.
10 smtp1.google.com.
10 smtp2.google.com.
googlemail.l.google.com.
66.249.83.83
66.249.83.19

#I need to modify this script so that it deletes the spaces in the beginning of the "name server" line, deletes the numbers and space before the mx records and replaces with a + symbol, and places a - symbol before the IP's. Here is what it should look like:

[jjamd64@localhost ~]$ ./dn.sh google.com
Name Server: NS1.GOOGLE.COM
Name Server: NS2.GOOGLE.COM
Name Server: NS3.GOOGLE.COM
Name Server: NS4.GOOGLE.COM
+smtp3.google.com.
+smtp4.google.com.
+smtp1.google.com.
+smtp2.google.com.
googlemail.l.google.com.
-66.249.83.83
-66.249.83.19

#I would like to use the sed command if possible and any hints would be much appreciated. I'm open to other suggestions as long as it produces the desired output. I really appreciate any direction and tips. THANKS! Smilie
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell. Options: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
June 6, 1993 BSD
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