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add env command
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pages/common/env.md
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pages/common/env.md
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# env
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> Show the environment or run a program in a modified environment
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- Show the environment
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`env`
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- Clear the environment and run a program
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`env -i {{program}}`
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- Remove variable from the environment and run a program
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`env -u {{variable}} {{program}}`
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- Set a variable and run a program
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`env {{variable}}={{value}} {{program}}`
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