Why does echoing $? vary differently when running in this script?
64037
Difference between ' and " on command line (bash)?
6462
Meaning of $? (dollar question mark) in shell scripts
129657
Why is $1 in a function not printing the script's first argument?
32293
What's the difference between if(!$variable) and if(isset($variable))?
36929
Why does comparing strings using either '==' or 'is' sometimes produce a different result?
143637
What does ${ } mean in PHP syntax?
19448
How do I use the ternary operator ( ? : ) in PHP as a shorthand for "if / else"?
155520
Why does $('#id') return true if id doesn't exist?
72527
Error missing $
61335
Difference between php echo and return in terms of a jQuery ajax call
45133
Echo tab characters in bash script
51432
What does the "$#" special parameter mean in Bash?
55375
What is the $ symbol used for in JavaScript
72413
$ versus jQuery
25478
What does ${1+"$@"} mean in a shell script, and how does it differ from "$@"?
27238
What's the right way to quote $(command $arg)?
142164
Why does my grep expression need to use $'string' to match tab characters?