Bash Chain of commands and operations logical chaining of commands with && and ||
Example
&& chains two commands. The second one runs only if the first one exits with success. || chains two commands. But second one runs only if first one exits with failure.
[ a = b ] && echo "yes" || echo "no"
# if you want to run more commands within a logical chain, use curly braces
# which designate a block of commands
# They do need a ; before closing bracket so bash can diffentiate from other uses
# of curly braces
[ a = b ] && { echo "let me see."
echo "hmmm, yes, i think it is true" ; } \
|| { echo "as i am in the negation i think "
echo "this is false. a is a not b." ; }
# mind the use of line continuation sign \
# only needed to chain yes block with || ....
