shell 日期類與字串轉數字的基本操作

字串轉換成數字有方法：

shell裡面怎麼樣把字串轉換為數字？

例如：a=「024」

let num=0123;

echo
$num
; 83

a=

$((1+2
));echo
$a;

a=

`expr 1 + 2`

# run_batch_date_type: m: monthly(run once a month)   w:weekly (obtain results: 0 for sunday, 1-6 for monday to saturday)  d:day (every day) default day type

# run_batch_date: specific batch running date .this field must be used with run_batch_date_type default : run_batch_date=1
run_batch_date_type=
"d"run_batch_date=1
# gets the day of the week for current system time
# week_day=`date -d "" +%w`
# month_day=`date -d "" +%d`
week_day=
`date -d "$end_date" +%w`
month_day=
`date -d "$end_date" +%d`if[
$run_batch_date_type
=="d"];
then
echo
"the run batch type is $ : day"
elif
[$run_batch_date_type
=="w"]&&
[ $[run_batch_date]
== $[week_day]];
then
echo
"the run batch type is $ : weekly ,the running time is weekly : $"
elif
[$run_batch_date_type
=="m"]&&
[ $[run_batch_date]
== $[month_day]];
then
echo
"the run batch type is $ : monthly ,the running time is monthly  : $"
else
# exit 0
echo
"no   $
$ "fi

if

[$run_batch_date_type
=="d"];
then
echo
"the run batch type is $ : day"
elif
[$run_batch_date_type
=="w"]&&
[$((run_batch_date))
==$((week_day)) ];
then
echo
"the run batch type is $ : weekly ,the running time is weekly : $"
elif
[$run_batch_date_type
=="m"]&&
[$((run_batch_date))
==$((month_day)) ];
then
echo
"the run batch type is $ : monthly ,the running time is monthly  : $"
else
echo
"not at script run time.  run_batch_date_type= $  run_batch_date=$,but week_day= $week_day ,month_day= $month_day"
exit 0
fi

退出狀態為 0 表示成功，退出狀態為非 0 表示執行失敗（出錯）。

注意：exit 退出狀態只能是乙個介於 0~255 之間的整數，其中只有 0 表示成功，其它值都表示失敗。

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