how to parse a large file for information

Posted on 2009-04-13
Medium Priority
Last Modified: 2013-12-26
I need to get information from a master file that contains user names and machines.
The 4th field contains the usernames and the 9th field contains systems that the user has access to.
My task is to create a list in 2 columns ( user host) that will list a user and every machines he/she has access to. The username will be repeated for each machine in the file.
i  am looking for a simple script that can accomplish this.Can any scripting guru please help?
Thanks in advance.
Question by:nesiuna_1
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LVL 40

Expert Comment

ID: 24134340
initially, you could do:

awk '{print $1, $9}' filename

if you can provide sample file data then script can be improved
LVL 48

Expert Comment

ID: 24135073
Please give some sample input/output.

Author Comment

ID: 24140330
this is the input file:
+gshepher:Yi/mOb6QeRcaU:5032:Greg Shepherd:/home/gshepher:/usr/bin/tcsh::staff,develop:ap1-bb15,ap1-bb15ua
i need to parse the 4th field and the 9th field.
The 4th field is the username and the 9th field is the hostnames
what i need is a printout in this format:
User                                       Hostname
user1                                      host1
user1                                      host2
user2                                      host1
user2                                      host2
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LVL 48

Expert Comment

ID: 24142417
awk -F, '{printf "%-10s\t%s\n",$4,$9}' inputfile
LVL 20

Expert Comment

ID: 24143388
awk -F: 'BEGIN{printf "%s\t%s\n","User","Hostname"}{printf "%s\t%s\n",$4,$9}' inputfile

(-F: because colon is the field separator)

Author Comment

ID: 24154448
The output of this script is this:
Felix Roytfeld  ap8-qa,perfap1-dv,perfdb1-dv,perfwb1-dv,sjcapp05

But what i am looking for something like this:
User                       Host
Felix Roytfeld        ap8-qa
Felix Roytfeld        perfap1-dv
Felix Roytfeld        perfb1-dv
Felix Roytfeld        sjcapp05

How can i the program to print out in this format?
LVL 20

Accepted Solution

simon3270 earned 2000 total points
ID: 24155459
Please try:

  awk -F: 'BEGIN{printf "%s\t%s\n","User","Hostname"}{split($9,hosts,",");for (h in hosts) printf "%s\t%s\n",$4,hosts[h]}' infile

Author Closing Comment

ID: 31569744
Thank you very much for your professional help.
i really appreciate the timely response.

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