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sorry..i tried using all these code..but it dun work
i have the following code

while test -z $username
do
echo -n "enter username: " ;read username
done

this code gives me an error if i...

i wil lbe using shell script and ubuntu to test..

how to ensure all files are being locked while updateing some files?
example when i want to update the password and shadow file in unix. how do i implement file locking??

please advice
thanks

if i am taking user input and the input contain space??

hi all
how do i check if a string consist of any space by using shell script.
i have the following code
while test -z $string
do
//prompting for another string if string is length 0
done
...

oh..ok..thanks a lot..

ok..thanks a lot..it works

this is my first time using shell and i know nothing.
erh...i need some sample code...
or do you have any site that is idiot proof?
thanks..

how do i create a directory.
how do check if the directory exist and it is valid?

thanks

how do i implement file locking in unix?
example if i want to update a file, i would like to use file locking. how do i implement it?
i am using shell script
thanks

what does NF mean? can i assign a variable to the number that is printed out?

can it reference to a variable?

example like
teststring= "wsd:ggs:ttj:sss"

how can i print out '4', separate the string with deliminter ':'

sorry..it works..thanks a lot...

sorry.i dun understand what you mean.
example a:c:d
i want it to return me 3 by counting how many field

hi
i am new to shell and would like ask some question about shell

how am i suppose to count the number of fields with delementer example
a:b:c:d
would return me 4
how am i going to do it...