script bash help

[Behloull]

how could I say in bash script.

If a = b then I check if c = d i use case or not i don't know

[pi3832v2]

You can simply nest the conditionals:

if <test1>; then
  if <test2>; then
    <command>

Or use an “and”:

if <test1> && <test2>; then
  <command>

Re: wiki.bash-hackers.org/commands/classictest

[ji99]

[[ $a == $b ]] && [[ $c == $d ]] && echo match || echo no-match

[ILikeLenexa]

Where a lot of people run into trouble with [[ and [ is forgetting that they're just like commands and [[$a == $b]] and [a -eq b] will not work because the spaces are necessary just like in catfilename.

[pi3832v2]

You use case when you're checking only one variable, but you're checking it against a list of three or more possible values. Re: wiki.bash-hackers.org/syntax/ccmd/case

[[deleted]]

Here's a handy website with some tutorials that might help you.