if-statement
Basic if else statement in Makefile
Change your make target to this (adding semicolons): check: if [ -z “$(APP_NAME)” ]; then \ echo “Empty”; \ else \ echo “Not empty”; \ fi For evaluating a statement in a shell without newlines (newlines get eaten by the backslash \) you need to properly end it with a semicolon. You cannot use real … Read more
Two conditions in a bash if statement
You are checking for the wrong condition. if [ “$choice” != ‘y’ ] && [ “$choice1″ != ‘y’ ]; The above statement is true when choice!=’y’ and choice1!=’y’, and so the program correctly prints “Test Done!”. The corrected script is echo “- Do You want to make a choice ?” read choice echo “- Do … Read more
SASS ignores variables, defined in if-statement
That’s completely expected. Variables have a scope to them. If you define them inside of a control block (like an if statement), then they won’t be available outside. So, what you need to do is initialize it outside like so: $text-color: null; $background-color: null; @if $colorscheme == white { $text-color: #333; $background-color: #fff; } @else … Read more
if, else, else if and end Lua
It’s elseif, not else if (notice the space). The error is because the interpreter expects an end to each else block. See the manual for more information.
Python statement of short ‘if-else’
m = 100 if t == 0 else 5 # Requires Python version >= 2.5 m = (5, 100)[t == 0] # Or [5, 7][t == 0] Both of the above lines will result in the same thing. The first line makes use of Python’s version of a “ternary operator” available since version 2.5, though … Read more
Using an IF Statement in a MySQL SELECT query
The IF/THEN/ELSE construct you are using is only valid in stored procedures and functions. Your query will need to be restructured because you can’t use the IF() function to control the flow of the WHERE clause like this. The IF() function that can be used in queries is primarily meant to be used in the … Read more