diff in && ; ;; commands ?

name_in_use450 · 06-11-2004, 09:34 AM

what is the difference in &&, ;, and ;; commands? example:

make && make install
make; make install
cd /tmp; ls
cd /tmp;; ls

etc.

thanks.

jim mcnamara · 06-11-2004, 10:19 AM

&& is a boolean (logical) and

Code:

ls file && cat file

this runs ls on the file, and if ls is successful - meaning it found a file, then
cat executes.

; makes an end of line

Code:

ls; ls; ls; ls

execute the ls command four times

jim mcnamara · 06-11-2004, 10:20 AM

oops -

;; is used to end case statements