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Top Forums Shell Programming and Scripting Average across multiple columns - awk Post 302986143 by Don Cragun on Sunday 20th of November 2016 09:06:33 PM
Old 11-20-2016
Since jillagre was kind enough to fix your earlier code to do what you said you wanted to do, why don't you show us what you have learned and try to add your new requirements to the code you now have. If you get stuck, we'll try to help; but we are here to help you learn how to write your own code. We are not here to act as your unpaid programming staff when your requirements change.

Will there always be two groups (rd and ru)? Or do you want code that will work for any number of groups with names consisting of any strings?

Will all lines for a given group be adjacent (as in your example), or will data for various groups be intermixed?
 

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group(4)						     Kernel Interfaces Manual							  group(4)

NAME
group - Group file DESCRIPTION
The /etc/group database contains the following information for each group: Group name Encrypted password Numerical group ID A comma-sepa- rated list of all users allowed in the group Note: Do not put any spaces between a comma and a username; otherwise, the username following the comma will not be made a part of the desired group. The /etc/group file is an ASCII file, with the fields separated by colons. Each group is separated from the next by a new line. If the password field is null, no password is demanded. Because of the encrypted passwords, it can and does have general read permission and can be used, for example, to map numerical group IDs to names. Note that commands or scripts used for adding users to groups are subject to the 225 character limit on line lengths. However, you can split lines as appropriate. RESTRICTIONS
Increasing the number of groups that a user is in beyond 16 can affect services that use ONC RPC. Tru64 UNIX ONC RPC supports up to 32 groups for compatibility with ULTRIX Version 4.2 and higher. Other vendors may support only 16 groups. ULTRIX versions before 4.2 support up to 8 groups. Users who increase their group membership beyond 8 or 16 groups will not be able to NFS mount file systems from servers that only support 8 or 16 groups over NFS. In addition, if root group membership is increased beyond 8 or 16, the NIS service will not work in a mixed NIS server environment where the servers support only 8 or 16 groups. The addgroup command limits the length of a group name to eight characters or less. FILES
/etc/group RELATED INFORMATION
Commands: addgroup(8), groupadd(8), adduser(8), groups(1), passwd(1) Functions: setgroups(2) Routines: initgroups(3) Files: passwd(4) delim off group(4)
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