Exclamation mark variable `$!`
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In Bash scripting, what's the meaning of " $! "?
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! Missing $ inserted.  $
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How do I escape the wildcard/asterisk character in bash?
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What does "${-#*i}" != "$-" mean?
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Stop rewriting trailing exclamation marks as question marks
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What is the meaning of $? in a shell script?
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Variable substitution with an exclamation mark in bash
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What is "!!" in C?
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What does the '!!!' syntax mean in javascript?
25478
What does ${1+"$@"} mean in a shell script, and how does it differ from "$@"?
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What is the difference between the "...", '...', $'...', and $"..." quotes in the shell?
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Why does local fn=$(...) mask the $? status code
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unnecessary exclamation marks(!)'s in HTML code
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Strange behavior of argv when passing string containing "!!!!"
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What does !! mean in ruby?
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How to properly escape exclamation points in bash?
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In bash, how do I escape an exclamation mark?