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The character double quote (
") is used to delimit a string value.
If the string contains special characters ($, \), they will be interpreted before returning the final result.
$ var1=xyz
$ echo "text1 $var1 \$notvar"
text1 xyz $notvar
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The character single quote (
') is used to delimit a string value.
If the string contains special characters ($, \), they will not be interpreted and they will be returned as is in the final result.
$ var1=xyz
$ echo 'text1 $var1 \$notvar'
text1 $var1 \$notvar
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The character grave accent (
`) is used to delimit a string value.
The whole string will be interpreted before returning the final result.
$ echo `date | tr [A-Z] [a-z]`
sat 24 feb 2015 16:21:33 est