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| > | Redirects the output of a command to a file, overwriting the file if it exists |
| >> | Redirects the output of a command to a file, appending to the file if it exists |
| < | Redirects input from a file to a command |
<< | Redirects a string into the standard input of a command |
Wildcards
Wildcards are "place holder" for one or many characters. A number of characters are interpreted by shell before any other action takes place. These characters are known as wildcard characters. Usually these characters are used in place of filenames or directory names.
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