Check if the command was misspelled.
Misspelling a command is one of the most common mistakes people can make. Check for the following:
Spaces between the command name and options. (If you don’t include spaces, the command thinks the option is part of the name of the command.)
Characters that you may be reading incorrectly — for example, is that number 1 really a letter l?
Case sensitivity. Remember that UNIX is case-sensitive. You can’t exchange a lowercase letter with an uppercase letter or vice versa and still expect it to work.
Words that may need to be substituted. Is “filename” supposed to be replaced with the name of an actual file? Is “n” supposed to be replaced by a number?
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