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Can anyone tell me what does echo $! mean and how it comes(meaning of '$' and '!')?
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echo command in linux is used to display line of text/string that are passed as an argument . This is a built in command that is mostly used in shell scripts and batch files to output status text to the screen or a file. Syntax : echo [option] [string]
redirects the output of the command on its left hand side to the end of the file on the right-hand side.
The echo command writes text to standard output (stdout). The syntax of using the echo command is pretty straightforward: echo [OPTIONS] STRING... Some common usages of the echo command are piping shell variable to other commands, writing text to stdout in a shell script, and redirecting text to a file.
$! PID of last job running in background.
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