40.7 Making Your at Jobs Quiet

Most modern versions of at will mail ( 1.33 ) you any output that your commands make. Some people try the command line below to throw that output into the UNIX trash can, /dev/null ( 13.14 ) :

>&	% at \f[CBO]sometime... >& /dev/null ...wrong

But that won't work because it throws away the output of the at command itself. at just saves your job in a file to be run later by a system program. The commands you want quiet are the commands stored in that file. One way to keep at quiet, if you use the C shell, is:

% 

at 



sometime



...

 at> 

some command



 >& /dev/null

 at> 

another command



 >& /dev/null

 at> 

...etc...



 >& /dev/null

 at> 
[CTRL-d]

The Bourne shell makes it easier:

exec >	$ at sometime ... at> exec > /dev/null 2>&1 at> some command at> another command at> ...etc... at> [CTRL-d]

Two notes:

• Some versions of at have a -s option that runs your job with the Bourne shell.

• Not all versions of at prompt you with at> as I showed above.