How does nested if/then/elseif work in bash?
91,342
I guess your question is about the dangling else ambiguity contained in many grammars; in bash there isn't such a thing. Every if
has to be delimited by a companion fi
marking the end of the if block.
Given this fact (besides other syntactic errors) you'll notice your example isn't a valid bash script. Trying to fix some of the errors, you might get something like this
if condition
then
echo "do this stuff"
elif condition
then
echo "do this stuff"
elif condition
then
echo "do this stuff"
if condition
then
echo "this is nested inside"
# this else _without_ any ambiguity binds to the if directly above as there was
# no fi closing the inner block
else
echo "this is nested inside"
# else
# echo "not nested"
# as given in your example is syntactically not correct !
# We have to close the last if block first as there's only one else allowed in any block.
fi
# now we can add your else ..
else
echo "not nested"
# ... which should be followed by another fi
fi
Author by
Andrew Tsay
Updated on February 17, 2021Comments
-
Andrew Tsay about 3 years
How does the syntax work in bash? This is my pseudocode for C style if else statements. For instance:
If (condition) then echo "do this stuff" elseif (condition) echo "do this stuff" elseif (condition) echo "do this stuff" if(condition) then echo "this is nested inside" else echo "this is nested inside" else echo "not nested"