Hi,
I need replace the contents of file1 to file2. What's the best way to
achieve this? Basically i need to replace the entries in file2 by
file1 entries. file2 should have entries of file1.
Please .

file1
root:x:4:0:Super:/:/sbin/sh
daemon:x:3:1::/:
bin:x:5:2::/usr/bin:
sys:x:7:3::/:
adm:x10:4:Adm:/var/adm

file2
root:x:0:0:Super-User:/:/sbin/sh
daemon:x:1:1::/:
bin:x:2:2::/usr/bin:
sys:x:3:3::/:
adm:x:4:4:Admin:/var/adm:
lp:x:71:8:Line Printer Admin:/usr/spool/lp:
uucp:x:5:5:uucp Admin:/usr/lib/uucp:
nuucp:x:9:9:uucp Admin:/var/spool/uucppublic:/usr/lib/uucp/uucico
smmsp:x:25:25:SendMail Message Submission Program:/:
listen:x:37:4:Network Admin:/usr/net/nls:
gdm:x:50:50:GDM Reserved UID:/:

explor wrote:
> Hi,
> I need replace the contents of file1 to file2. What's the best way to
> achieve this? Basically i need to replace the entries in file2 by
> file1 entries. file2 should have entries of file1.

To replace all entries in file1 by all entried in file2 is equivalent
to replace the file1 by file2; use the copy command: cp file2 file1

If, what seems more likely, you want to replace for each user name in
one file the corresponding entries with the same user name in the other
file then use

awk -F: 'NR==FNR{entry[$1]=$0;next}$1 in entry{$0=entry[$1]}1' f1 f2

where f1 f2 are either file1 file2 or file2 file1, depending where the
replacement shall take place (as I understand you, the former).

Janis

> Please .
>
> file1
> root:x:4:0:Super:/:/sbin/sh
> daemon:x:3:1::/:
> bin:x:5:2::/usr/bin:
> sys:x:7:3::/:
> adm:x10:4:Adm:/var/adm
>
> file2
> root:x:0:0:Super-User:/:/sbin/sh
> daemon:x:1:1::/:
> bin:x:2:2::/usr/bin:
> sys:x:3:3::/:
> adm:x:4:4:Admin:/var/adm:
> lp:x:71:8:Line Printer Admin:/usr/spool/lp:
> uucp:x:5:5:uucp Admin:/usr/lib/uucp:
> nuucp:x:9:9:uucp Admin:/var/spool/uucppublic:/usr/lib/uucp/uucico
> smmsp:x:25:25:SendMail Message Submission Program:/:
> listen:x:37:4:Network Admin:/usr/net/nls:
> gdm:x:50:50:GDM Reserved UID:/:
>