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Thanks teaching, I try run the "at" command on Ubuntu , Why it is show two different words? 1. Garbled time 2. % at usage: at [-q x] [-f file] [-m] time at -c job [job ...] at [-f file] -t [[CC]YY]MMDDhhmm[.SS] at -r job [job ...] at -l -q queuename at...