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Top Forums Shell Programming and Scripting Unable to read Environment Variable Post 302697729 by methyl on Friday 7th of September 2012 09:22:06 AM
Old 09-07-2012
When you invoked the script with sh test1.sh the Shebang line is ignored and the script was run with Bourne Shell. The syntax was incorrect for Bourne Shell. It would of course have worked with csh test1.sh.

When you made the script executable and ran it as ./test1.sh the Shebang line was executed and the script ran with C Shell.

Unless you have a very good reason for using C Shell, you will find learning Bourne Shell much more useful in the modern unix and Linux world. All system scripts are Bourne Shell or some enhance form of Bourne Shell.
 

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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)
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