Can anyone tell me what does echo $! mean and how it comes(meaning of '$' and '!')?
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Related http://stackoverflow.com/questions/5163144/what-are-the-special-dollarsign-variables-possibly-bash-only – coelhudo Jul 06 '12 at 20:21
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2man bash... look for `special parameters` – Anya Shenanigans Jul 06 '12 at 20:22
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It's not in "Linux". I guess tou mean `bash` or another shell. The `$!` thing can also be used on bash on an proprietary Unix. – Luc M Jul 06 '12 at 20:23
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...or in any POSIX-compliant shell, not just bash. – Charles Duffy Apr 14 '21 at 16:01
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1@Vertexwahn, ...btw, editing old posts does have the effect of bringing them back to the front page; something to consider when evaluating the value of a trivial edit, particularly to a question that consensus has determined to be off-topic. – Charles Duffy Apr 14 '21 at 16:03
