06-15-2006
Shell basics
Hi All,
I have a basic question in Scripting.
Can anyone tell me what is the difference b/w the two syntax :
if (( $lines = 0 ));
and
if [ $lines -eq 0 ];
when do we use the square brackets & when to use the paranthesis.
Thanks,
Pradeep
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biff(1) General Commands Manual biff(1)
NAME
biff - Notifies users when mail arrives
SYNOPSIS
biff [y | n]
DESCRIPTION
The biff command informs the system whether you want to be notified when mail arrives during the current terminal session. The following
command enables notification: biff y
The following command disables notification: biff n
When mail notification is enabled, the From: and Subject: header lines and up to the first five lines of the message are displayed. The
total display is 560 characters, or seven lines terminated by newline characters, whichever occurs first.
The biff y command is often included in the $HOME/.login or $HOME/.profile file to be executed each time you log in.
The biff command operates asynchronously. For synchronous notification, use the MAIL variable of sh or ksh, or the mail variable of csh.
EXAMPLES
To display the current setting, enter: biff To be notified during the current terminal session whenever mail arrives, enter the following
in your $HOME/.login or $HOME/.profile file: biff y
FILES
Read by login shell (after login. User profile.
SEE ALSO
Commands: comsat(8), csh(1), ksh(1), mail(1), mailx(1), Bourne Shell sh(1b), POSIX Shell sh(1p)
biff(1)