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Top Forums Shell Programming and Scripting Print values within groups of lines with awk Post 302958622 by Don Cragun on Saturday 24th of October 2015 03:56:35 AM
Old 10-24-2015
Quote:
Originally Posted by looney
Hi could you please explain how your code is working , specially
PHP Code:
a="";b="";c="";d="";e="" 
Thanks,
When a header is found, all of the data fields are cleared (i.e., set to empty strings) by the above statement.
The individual data fields are filled in as they are found by the statements on the following lines in the script. All of the fields have to be cleared so data from an earlier header isn't printed as data from a later header that did not contain entries for some fields.
 

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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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