On Thu, 27 Jan 2000, TAG wrote:
> HI ALL,
>
> ie: /usr/home/<user>/file needs to be converted with a program "convert"
> into /home/<user>/file2 - but I have over 3000 users??
Simple :)
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You get a list of all users by analyzing /etc/passwd:
cat /etc/passwd | awk -F: ' { print $1 } ' >
/userlist.txt
( I added some extra spaces for readability )
this forwards each line of the password file to awk
and then awk prints the first field of each line.
-F: is used to set the field separator to ":"
The lines in /etc/password begin with "username:some more text"
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Similarly you can create a script that does the conversion:
cat /etc/passwd | awk -F: ' { print "convert
/usr/home/"$1"/file
/home/"$1"/file2 } ' > /convert_script
now command:
chmod +x /convert_script
./convert_script
and you get the conversion done. Remember the preceeding dot&slash.
If you need to make directories, then just add
print "mkdir /home/"$1;
between the "{" and the "print". Do not forget the ";"
P L E A S E R E A D F U R T H E R !
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Remember to remove users root, sys, bin, daemon etc. from
the script file before running it.
You can also automatically remove selected users from the file:
Modify the begining of the command:
cat /etc/passwd | grep -f /nonwanted -v | awk -F: ' {
print "convert /usr/home/"$1"/file /home/"$1"/file2 } ' >
/convert_script
Here we use grep to filter out those usernames that we do not
want to pass on to the awk program. /nonwanted is a simple
text file that contains excluded usernames one per row:
root
sys
bin
daemon
...
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This is a bit clumsy way as we create a 3000 row script file,
but at least you get the job done.
Maybe awk has an execute-command to replace this
create-an-ugly-scriptfile-method... Take a closer look
at awk manuals for fine tuning.
I would recommend you to study both awk, sed and grep-commands.
They are quite useful and flexible.
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Ralf Christian Strandell
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.~.
/V\ L I N U X
// \ >Don't fear the penguin<
/( )\
^^-^^
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