Why does echo $$ return a number?
75274
Special variables in bash
26972
What are '$$' used for in PL/pgSQL
11423
Understand the meaning of `$_`
148300
Why $0 is not a positional parameter?
18722
Should I use $* or $@?
83409
Difference between $ and # in Linux environment
54313
What is $() in a command?
108681
What is the $? (dollar question mark) variable in shell scripting?
80950
Why does "echo '2' . print(2) + 3" print 521?
119518
bash function cannot change the value of a local variable when called by $()
98029
How do I access a PHP object attribute having a dollar sign?
129657
Why is $1 in a function not printing the script's first argument?
103008
What does !$ mean?
100230
Reading a javascript script, why so many $ (dollar signs)?
55375
What is the $ symbol used for in JavaScript
38430
In PHP, what does the ${$ } syntax do?
101854
What is the difference between $@ and $* in shell scripts?