Linux Standard Base Core Specification 4.1 | ||
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at is as specified in POSIX 1003.1-2001 (ISO/IEC 9945-2003) but with differences as listed below.
-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. |