What does "$?" give us exactly in a shell script?
6462
Meaning of $? (dollar question mark) in shell scripts
55375
What is the $ symbol used for in JavaScript
101999
What's is the difference between ">" and ">>" in shell command?
18438
Spaces in variable assignments in shell scripts
114539
${1:+"$@"} in /bin/sh
112100
What is the meaning of "$" sign in JavaScript
8651
Bash scripting unexpected operator
76281
What does $(command) & do?
23092
What does "$$" mean in the shell?
99330
Why do you need $ when accessing array and hash elements in Perl?
59672
What are the special dollar sign shell variables?
38402
What is the meaning of the ${0##...} syntax with variable, braces and hash character in bash?
74090
$_ vs !$. Last argument of the preceding command and output redirection
58687
What is the difference between $(command) and `command` in shell programming?
14779
How do ${0##*/} and ${0%/*} work?
36359
What does $# mean in shell?
67917
what does $('') do?