Linux Shells by Example

Double Quotes (see Table C.2):

1. Must be matched.

2. Protects all metacharacters from interpretation except:

   1. Itself

   2. Exclamation (!) point (bash, csh)

   3. $ used for variable substitutiond.

   4. Backquotes (` ` ) for command substitution

Table C.1. Using Single Quotes and Backslashes

C Shell	Bourne Shell	Korn Shell	TC Shell	Bash Shell
echo '$><%^&*'	echo '$*&!><?'	echo '$*&!><?'	echo '$><%^&*'	echo '$*&!><?'
echo 'I need $5.00\!'	echo 'I need $5.00!'	echo 'I need $5.00!'	echo 'I need $5.00!'	echo 'I need $5.00!'
echo 'She cried, "Help"'	echo 'She cried, "Help"'	echo 'She cried, "Help"'	echo 'She cried, "Help"'	echo 'She cried, "Help"'
echo '\\\\' \\\\	echo '\\\\' \\	print '\\\\' \\	echo '\\\\' \\	echo '\\\\'

Table C.2. Using Double Quotes

C Shell	Bourne Shell	Korn Shell	TC Shell ...