time-env-set 1 user commands nosh time-env-set time-env-set-if-earlier time-env-set-if-later time-env-unset-if-earlier time-env-unset-if-later time-env-unset-if-null-or-later set environment variables to external TAI64N timestamps time-env-set var timestamp next-prog time-env-set-if-earlier var timestamp next-prog time-env-set-if-later var timestamp next-prog time-env-unset-if-earlier var timestamp next-prog time-env-unset-if-later var timestamp next-prog time-env-unset-if-null-or-later var timestamp next-prog time-env-set, time-env-set-if-earlier, time-env-set-if-later, time-env-unset-if-earlier, time-env-unset-if-later, and time-env-unset-if-null-or-later parse timestamp to yield a TAI64N time. They then set or unset the environment variable var, and then chain load to next-prog with the execvp3 function. time-env-set sets the variable to the timestamp for that time. time-env-set-if-earlier sets the variable to the timestamp for that time if, after parsing the variable's existing value as a timestamp, the timestamp time is earlier than the existing value or the existing value is null. time-env-set-if-later sets the variable to the timestamp for that time if, after parsing the variable's existing value as a timestamp, the timestamp time is later than the existing value or the existing value is null. time-env-unset-if-earlier unsets the variable if, after parsing the variable's existing value as a timestamp, the timestamp time is non-null and is earlier than the existing value. time-env-unset-if-later unsets the variable if, after parsing the variable's existing value as a timestamp, the timestamp time is non-null and is later than the existing value. time-env-unset-if-null-or-later unsets the variable if, after parsing the variable's existing value as a timestamp, the timestamp time is null or is later than the existing value. next-prog may contain its own command line options, which these commands will ignore. The format of timestamp is as explained in the manual for time-print-tai64n1. The environment variable value, when set, is always set to the @hexdigits 24-character TAI64N external form. Jonathan de Boyne Pollard