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Running processes in a single pgid.
Changing foreground group to the group of running processes (if readline doesn't
end with &).
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Autocomplete program and file names (tab).
Moving the cursor to edit commands (left and right arrows).
Deleting a character in a command (backspace).
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Added pipeline.
Formatting shell.c (created lexical_analysys.c).
Error codes.
Some functions of queue.c are created by preprocessor.
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Moving zombie process cleanup to the signal handler.
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Redirecting standard input-output streams.
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Added the ability to run programs in the background.
Added tokens for future releases.
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Implementation of launching external programs via fork().
Running cd as a change to the current process directory (chdir).
Ability to change to user's home directory (cd without arguments).
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