bash bug

kingbo

kingbo@kingbo ~ $ i=1888;j=10;echo $[i+j]
1898

kingbo@kingbo ~ $ i=1888;j=09;echo $[i+j]
bash: 09: value too great for base (error token is "09")

kingbo@kingbo ~ $ i=1888;j=9;echo $[i+j]
1897

kingbo@kingbo ~ $ i=1888;j=08;echo $[i+j]
bash: 08: value too great for base (error token is "08")

kingbo@kingbo ~ $ i=1888;j=8;echo $[i+j]
1896

kingbo@kingbo ~ $ i=1888;j=07;echo $[i+j]
1895

kingbo@kingbo ~ $ i=1888;j=06;echo $[i+j]
1894

kingbo@kingbo ~ $ i=1888;j=05;echo $[i+j]
1893

kingbo@kingbo ~ $ i=1888;j=04;echo $[i+j]
1892

kingbo@kingbo ~ $ i=1888;j=03;echo $[i+j]
1891

kingbo@kingbo ~ $ i=1888;j=02;echo $[i+j]
1890

kingbo@kingbo ~ $ i=1888;j=01;echo $[i+j]
1889

很明显，用到09 08就出问题
kingbo@kingbo ~ $ i=09;printf %d  $i
bash: printf: 09: invalid number

kingbo@kingbo ~ $ i=08;printf "%d"  $i
bash: printf: 08: invalid number

kingbo@kingbo ~ $ i=07;printf "%d"  $i
7

printf "%d"  09
bash: printf: 09: invalid number

printf "%d"  08
bash: printf: 08: invalid number

kingbo@kingbo ~ $ printf "%d"  07
7

solaris5.8工作站一样
b25001{owuser}% printf "%d\n" 09
printf: 09 not completely converted
0

b25001{owuser}% printf "%d\n" 9
9

b25001{owuser}% printf "%d\n" 8
8

b25001{owuser}% printf "%d\n" 08
printf: 08 not completely converted
0

b25001{owuser}% printf "%d\n" 07
7

Jockey

09、08是不合法的八进制数，就像二进制数串里不会出现除了“0”和“1”之外的位。你别告诉我你不知道“0”开头的整数是八进制数...