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73.
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There are two different types of users:
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(no translation yet)
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Located in
docs/basics/C/basics.xml:307(para)
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74.
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<emphasis role="strong">Physical Users</emphasis> are people who use the system physically. They have user IDs which are usually unique, as well as group IDs.
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(no translation yet)
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Located in
docs/basics/C/basics.xml:312(para)
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75.
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<emphasis role="strong">Logical Users</emphasis> are not tied to a person, but instead are tied to a system function that are used by applications to perform specific tasks. Daemons, mail, news are examples of logical users.
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(no translation yet)
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Located in
../docs/basics/C/basics.xml:319(para)
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76.
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Groups
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(no translation yet)
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Located in
docs/basics/C/basics.xml:327(title)
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77.
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Groups are logical expressions of organization. They tie users together and provide group-based, rather than user-based permissions. Common groups include <emphasis>admin</emphasis>, <emphasis>audio</emphasis>, <emphasis>mail</emphasis>.
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(no translation yet)
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Located in
../docs/basics/C/basics.xml:329(para)
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78.
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Permissions
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(no translation yet)
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Located in
docs/basics/C/basics.xml:339(title)
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79.
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In a multi-user environment, security of user and system data is important. Linux has three specific, or distinct, classes:
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(no translation yet)
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Located in
docs/basics/C/basics.xml:340(para)
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80.
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<emphasis role="strong">r</emphasis> - <emphasis>read</emphasis> permission which grants the ability to read a file.
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(no translation yet)
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Located in
docs/basics/C/basics.xml:346(para)
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81.
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<emphasis role="strong">w</emphasis> - <emphasis>write</emphasis> permission which grants the ability to modify a file.
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(no translation yet)
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Located in
docs/basics/C/basics.xml:352(para)
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82.
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<emphasis role="strong">x</emphasis> - <emphasis>execute</emphasis> permission which grants the ability to execute a file.
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(no translation yet)
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Located in
docs/basics/C/basics.xml:358(para)
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