what is $$ in bash?
8641
Which are the (Bash) shell special parameters/variables?
65571
How to print "$" in here-document
112888
What does $#array mean in Perl?
100299
Using dollar sign in shell scripting
26972
What are '$$' used for in PL/pgSQL
24077
What the #$@&%*! is that called?
7431
How does ${!#} work in bash to get the last command-line argument?
74845
Difference between single and double quotes in Bash
83409
Difference between $ and # in Linux environment
71747
What's the difference between $(stuff) and `stuff`?
11975
What does $@ mean in a shell script?
47449
What is the difference between . (dot) and $ (dollar sign)?
143637
What does ${ } mean in PHP syntax?
138524
$* in bash scripting
91116
Difference between $ and ()
35426
Why does echo $$ return a number?
114539
${1:+"$@"} in /bin/sh