| Symbol
|
Description
|
|
$0 |
linux
command |
|
$n |
the
number of the position on the command line, where n
represents a number. |
|
${nn} |
any
number that exceeds a single digit |
|
$# |
the
count of the command line arguments |
|
$* |
all
the command line arguments beginning with the first argument |
|
$@ |
the
command line arguments individually quoted. Is the same as $*,
except when enclosed in double quotation marks
|
|
$? |
the
return status of the most recently executed command |
|
$$ |
the
process id of the current process |
|
$! |
the
process id of the last background command |
|
“$*” |
all
the command line arguments beginning with 1 and expanded to a
single argument, Example: “$1 $2 $3” |
|
“$@” |
the
command line arguments individually quoted and expanded to separate
arguments Example: “ “$1” “$2” “$3” |
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