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Better exit definition, and clarification around no prompt in batch mode.

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This commit is contained in:
Remzi Arpaci-Dusseau
2018-02-12 08:05:32 -06:00
parent bea75caaa9
commit dfdaf53ac2
1 changed files with 7 additions and 1 deletions
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8
processes-shell/README.md
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@@ -56,6 +56,9 @@ run the shell with a batch file named `batch.txt`:
prompt> ./wish batch.txt prompt> ./wish batch.txt
``` ```
One difference between batch and interactive modes: in interactive mode, a
prompt is printed (`wish> `). In batch mode, no prompt should be printed.
You should structure your shell such that it creates a process for each new You should structure your shell such that it creates a process for each new
command (the exception are *built-in commands*, discussed below). Your basic command (the exception are *built-in commands*, discussed below). Your basic
shell should be able to parse a command and run the program corresponding to shell should be able to parse a command and run the program corresponding to
@@ -214,7 +217,10 @@ message whenever you encounter an error of any type:
The error message should be printed to stderr (standard error), as shown The error message should be printed to stderr (standard error), as shown
above. above.
After *any* error, your shell should immediately exit by calling `exit(1)`. After ~~*any*~~ most errors, your shell simply *continue processing* after
printing the one and only error message. However, if the shell is invoked with
more than one file, or if the shell is passed a bad batch file, it should exit
by calling `exit(1)`.
There is a difference between errors that your shell catches and those that There is a difference between errors that your shell catches and those that
the program catches. Your shell should catch all the syntax errors specified the program catches. Your shell should catch all the syntax errors specified