This command is used to get list of files & folder at a particular path. Suppose there is a folder containing files and you want to know what all files are there in that folder we use this command. We use certain switches to get desired output.
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ls [OPTION]... [FILE]... |
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// Go to a folder and enter ls command like below $ ls |

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$ ls -l |
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$ ls -a |

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$ ls -F |

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$ ls -r |

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$ ls -ltr |

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$ ls -ls |

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$ ls ~ |
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$ ls ~Aman |