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Update README.md 

Added 'stdin' to discussion of i/o redirection
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Gavin Inglis 2019-06-18 16:51:18 -04:00 committed by GitHub
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@ -57,7 +57,7 @@ Notes:
- Know that some commands are not executables, but Bash builtins, and that you can get help on them with `help` and `help -d`. You can find out whether a command is an executable, shell builtin or an alias by using `type command`.
- `curl cheat.sh/command` will give a brief "cheat sheet" with common examples of how to use a shell command.
- Learn about redirection of output and input using `>` and `<` and pipes using `|`. Know `>` overwrites the output file and `>>` appends. Learn about stdout and stderr.
- Learn about redirection of output and input using `>` and `<` and pipes using `|`. Know `>` overwrites the output file and `>>` appends. Learn about stdin, stdout and stderr.
- Learn about file glob expansion with `*` (and perhaps `?` and `[`...`]`) and quoting and the difference between double `"` and single `'` quotes. (See more on variable expansion below.)