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echo "��������=$#"

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if [ -f /home/ldt/myshell/add.sh ]
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SUM=0
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do
SUM=$[$SUM+$i]
done
echo "�ܺ�SUM=$SUM"

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basename /home/aaa/test.txt
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[ function ] funname[()]
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ԭ�ĵ�ַ��https://www.cnblogs.com/li-zi-feng/p/14776299.html