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[rich@localhost ~]$ echo $str | cut -d "-" -f 1
AAAAA
[rich@localhost ~]$ echo $str | cut -d "-" -f 2
BBBBBB
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[rich@localhost ~]$ echo $str | cut -c`expr "${index}" + 1`-
BBBBBB
[rich@localhost ~]$ echo $str | cut -c1-`expr ${index} - 1`
AAAAA
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[rich@localhost ~]$ index=`expr ${index} - 1`
[rich@localhost ~]$ echo `expr substr "${str}" 1 ${index}`
AAAAA
substr str A B
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