Multiple conditions in if statement shell script

Question

I would like to know whether it is possible to have more than two statements in an if statement when you are writing a shell script   username1  BOSS1  username2  BOSS2  password1  1234  password2  4321   if   username     username1    amp  amp     password    password1            username     username2    amp  amp     password    password2     then   This does NOT work  But is there a way to make it work   Thanks

User · Answer

You are trying to compare strings inside an arithmetic command (((...))). Use [[ instead.

if [[ $username == "$username1" && $password == "$password1" ]] ||
   [[ $username == "$username2" && $password == "$password2" ]]; then

Note that I've reduced this to two separate tests joined by ||, with the && moved inside the tests. This is because the shell operators && and || have equal precedence and are simply evaluated from left to right. As a result, it's not generally true that a && b || c && d is equivalent to the intended ( a && b ) || ( c && d ).

User · Answer

if using  bin sh you can use   if    lt condition gt     amp  amp     lt condition gt     then         fi   if using  bin bash you can use   if     lt condition gt   amp  amp   lt condition gt      then         fi

[shell] Multiple conditions in if statement shell script

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