What is the point of echo $$
35426
Why does echo $$ return a number?
148295
Shell variable $_ not behaving as expected
120580
What does "=>" mean in PHP?
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Special variables in bash
42711
What does $$ mean in the shell?
5618
$VAR vs ${VAR} and to quote or not to quote
113103
Difference between period and comma when concatenating with echo versus return?
7431
How does ${!#} work in bash to get the last command-line argument?
54322
What is the difference between the "...", '...', $'...', and $"..." quotes in the shell?
36359
What does $# mean in shell?
57007
What is the meaning of $? in a shell script?
7253
How does $ work in NASM, exactly?
104154
How to echo "$x_$y" in Bash script?
26972
What are '$$' used for in PL/pgSQL
34841
"echo -n" prints "-n"
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What does $#array mean in Perl?
98451
Why can't I echo the characters #! in a string in bash?