Linux Standard Base Core Specification 4.1
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at

Name

at -- examine or delete jobs for later execution

Description

at is as specified in POSIX 1003.1-2001 (ISO/IEC 9945-2003) but with differences as listed below.

Differences

Options

-d 

is functionally equivalent to the -r option specified in POSIX 1003.1-2001 (ISO/IEC 9945-2003).

-r 

need not be supported, but the '-d' option is equivalent.

-t time 

need not be supported.

Optional Control Files

The implementation shall support the XSI optional behavior for access control; however the files at.allow and at.deny may reside in /etc rather than /usr/lib/cron.

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