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Forum: UNIX for Dummies Questions & Answers 08-14-2011

$$ and $#: what do they mean

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% echo $$ 32558 % ps PID TTY ...

% echo $$
32558

% ps
PID TTY TIME CMD
32558 pts/0 00:00:00 zsh
32642 pts/0 00:00:00 ps

% cat >script
echo $#

% sh script a b c d
4

% sh script xxx 'yyy zzz'
2

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