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clarify $ escaping in Exec* lines
Explain that literal $ can be passed by doubling it.
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@ -369,7 +369,8 @@
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case it will be replaced by the value
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of the environment variable split up
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at whitespace, resulting in zero or
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more arguments. Note that the first
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more arguments. To pass literal dollar sign
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use <literal>$$</literal>. Note that the first
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argument (i.e. the program to execute)
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may not be a variable, since it must
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be a literal and absolute path
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