shell的流程式控制制語句

來源:互聯網
上載者:User
條件陳述式if-then結構
if [ condition ]
then
  commands
fi

注意,若要將then和if放在同一行,需要這麼寫:if [ condition ]; then,shell中用;號分割同一行中的各條命令。

此外,[]和condition之間一定要有空格!!!關於condition的寫法見這裡。

if-then-else結構
if [ condition ]
then
  true-commands
else
  false-commands
fi
if-then-elif結構
if [ condition_1 ]
then
  commands_1
elif [ condition_2 ]
then
  commands_2
elif [ condition_3 ]
then
  commands_3
...
...
else
  commnads_n
fi
迴圈語句for迴圈:for-in-done結構
for variable in list-of-values
do
  commands
done
while迴圈:while-do-done結構
while [ condition ]
do
  commands
done
until迴圈:until-do-done結構
until [ condition ]
do
  commands
done
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