📝 字数：working on
Bash¶
Estimated time to read: 1 minute
Setup Shell¶
Usage¶
exec "$@"
exec would replace the current shell;
$@ means all the positional arguments passed to the script.
$1¶
positional arguments of the scripts: $0 $1 $2
-z string¶
return true if the length of the string is zero ;