Help regarding shell script Post: 302492635

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Top Forums Shell Programming and Scripting Help regarding shell script Post 302492635 by Chubler_XL on Tuesday 1st of February 2011 04:43:18 AM

02-01-2011

Moderator

Ok the function max(a,b) returns the maximum of two integers, ie highest of a or b.

FNR==1 {file++} This says if file line number is 1 (first line of the file) then increment file variable. This is used to test what file is being processed 1=/etc/group 2=/etc/passwd 3=ls output.

file==1 {g[$3]=$1;GW=max(GW,length($1));next} This loads the group file into the has array g[] with the group id (field 3) as the key and group name (field 1) as the data. It also uses the max(a,b) function to set GW as maximum length of groupname.

file==2 {p[$3]=$1;PW=max(PW,length($1));next} same as group above except hash array is p[] and PW is maximum login.

Code:

{ split(substr($0,S,L), ID, " ");
  printf "%s %-*s %-*s%s\n", substr($0,1,S-1), PW, p[ID[1]], GW, g[ID[2]],substr($0,S+L) }

This extracts the UID and GID from the ls output by fetching a substring from S to S+L and spliting it up using space seperators into ID[1] and ID[2] variables.
The string from 0-S is printed
The ID[1] (UID) field is looked up in the P[] hash array and the loginID is fetched, this is printed left justified to a width of PW.
The ID[2] (GID) field is looked up in the G[] hash array and the GroupName is fetched, this is printed left justified to a width of GW.
The the rest of the ls string from S+L to the end is printed.

Chubler_XL

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LEARN ABOUT POSIX

grpck

grpck(1B)					     SunOS/BSD Compatibility Package Commands						 grpck(1B)

NAME

       grpck - check group database entries

SYNOPSIS

       /etc/grpck [filename]

DESCRIPTION

       The grpck utility checks that a file in group(4) does not contain any errors; it checks the /etc/group file by default.

FILES

       /etc/group

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       groups(1), group(4), passwd(4), attributes(5)

DIAGNOSTICS

       Too many/few fields

	   An entry in the group file does not have the proper number of fields.

       No group name

	   The group name field of an entry is empty.

       Bad character(s) in group name

	   The group name in an entry contains characters other than lower-case letters and digits.

       Invalid GID

	   The group ID field in an entry is not numeric or is greater than 65535.

       Null login name

	   A login name in the list of login names in an entry is null.

       Logname not found in password file

	   A login name in the list of login names in an entry is not in the password file.

       Line too long

	   A line (including the newline character) in the group file exceeds the maximum length of 512 characters.

       Duplicate logname entry

	   A login name appears more than once in the list of login names for a group file entry.

       Out of memory

	   The program cannot allocate memory in order to continue.

       Maximum groups exceeded for logname

	   A login name's group membership exceeds the maximum, NGROUPS_MAX.

SunOS 5.10							    10 Jan 2000 							 grpck(1B)