Difference of (( )) and $(( )) in bash script
Hello, While going through reading some bash tutorial I am stuck here..
I am not able to get where should I use (( )) and $(( )). Could someone please provide me an example to understand it better. Thanks!
(( )) Evaluates and assigns value to a variable and does math in a shell
$(( )) Evaluates the enclosed expression
I am not able to get where should I use (( )) and $(( )). Could someone please provide me an example to understand it better. Thanks!
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(( )) is for mathematical logical conditions
(( 7+8 == 15 )) && echo true
[[ ]] is for non mathematical logic
name=beer9
[[ $name == "beer9" ]] && echo equal
(( 7+8 == 15 )) && echo true
[[ ]] is for non mathematical logic
name=beer9
[[ $name == "beer9" ]] && echo equal
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Shell Scripting
The term 'shell' refers to a general class of text-based command interpreters most often associated with the UNIX and Linux operating systems. Popular shells include Bourne, Debian Almquist (dash), Korn (ksh), Bourne Again (bash) and the C shell family (csh). Some view the DOS 'cmd' prompt as a minimal shell of sorts. It is also possible to install Cygwin on Windows and emulate a full Unix environment with complete shell capabilities. Terminal emulators, such as xterm, GNOME Terminal and OS X Terminal, can be used to access shell.
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(( )) is for logical expression (true or false conditions)