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Special Characters

;
separates commands on a single line
&
execute command in the background
&&
execute following command only if previous command returned a zero value (i.e. it was successful)
||
execute following command only if previous command returned a non-zero value (i.e. it failed)
'....'
single quotes; treat enclosed characters literally
"...."
double quotes treat enclosed characters literally but perform variable and history substitutions
`....`
back quotes; execute enclosed characters as a command and substitute output
.
refers to current directory
..
refers to parent of this directory

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