 | | each program (eqn, tbl, troff, psdit, and lp) would be running as a separate process with a separate process ID (e.g., 123, 124, 125, 126, and 127). However, all five processes would have the same process group ID, e.g., 127. This allows the shell to treat those five processes as a single entity (a “job”) for purposes of stopping them, continuing them, and moving them between the foreground and the background. | |
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