I want to read username and lastupdate only from /etc/security/passwd and write the s

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vipw

vipw(8) 						      System Manager's Manual							   vipw(8)

NAME

       vipw - Edits the /etc/passwd file

SYNOPSIS

       /usr/sbin/vipw

DESCRIPTION

       You  use  the vipw command to edit the /etc/passwd file with the editor defined in the EDITOR environment variable.  If the variable is not
       set, the default editor is vi.

       The vipw command performs basic consistency checks on the edited file.  If a hashed indexed passwd existed  previously,	the  vipw  command
       uses the mkpasswd command to create recreate it.

       The  command must not be used on systems that use extended security attributes since it cannot set or change them.  You must be root to run
       this command.  Only root and security administrators should have execute access to this command.

       Since the vipw command cannot effectively change all the attributes of users, it should not be used in a secure environment.

       The vipw command accesses the following files, and requires the listed permissions:

       ------------------------------
       Permissions   File
       ------------------------------
	   rw	     /etc/passwd

	   rw	     /etc/passwd.pag

	   rw	     /etc/passwd.dir

	   rw	     /etc/ptmp

	   rw	     /etc/ptmp.pag

	   rw	     /etc/ptmp.dir
       ------------------------------

EXAMPLE

       To edit the /etc/passwd file, type the following command and add the required line entry: vipw

FILES

       Specifies the command path

RELATED INFORMATION

       Commands:  passwd(1), passwd(4), adduser(8), mkpasswd(8) delim off

																	   vipw(8)

AIX