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to SlyMaelstrom:

I tried your suggestion. However, ls|time abc.txt is not a valid command as the system expect time [option] and thus the abc.txt can't be write after it.

Anyway, still thanks...

I need to measure a process execution time in my own shell program.

Currently, I am research on the "time" command provides by unix system.

At the terminal, I typed the command "time ls",...