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shell简介入门之bash编程之流程控制(2)

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发表于 2010-9-17 18:43:23 | 显示全部楼层 |阅读模式
 F::
  while
  语法如下:
  while(condition)
  do
   commands
  done
  例如:
  #!/bin/bash
  number=0
  while(test $number -lt 10)
   do
   echo "$number\c"
   number=`expr $number+1`
  done
  echo
  -----------------------------------------
  结果如下:
  0123456789
  G::
  until
  语法如下:
  until(condition)
  do
   commands
  done
  它和while的不同只在于while是在条件为真时执行循环,而until是在条件为假时执行循环。
  H::
  break及continue
  这两者是用于for,while,until等循环控制下的。break会跳到done后才执行,而continue会跳至
  done后才执行,而continue会跳至done执行,继续执行循环。
  I::
  case
  语法如下:
  case str in
   pat1) commands1;;
   pat2) commands2;;
   pat3) commands3;;
  esac
  而pat除了可以指定一些确定的字符串,也可以指定字符串的集合,如下:
  * 任意字符串
  ?   任意字符
  [abc]  a,b,c三字符其中之一
  [a-n]  从a到n的任一字符
  │    多重选择
  例如:
  test8.sh
  -----------------------------------------------------------
  #!/bin/bash
  echo `enter A,B,C:"
  read letter
  case $letter in
  A│a) echo `you entered A.`;;
  B│b) echo `you entered B.;;
  C│c) echo `you entered C,;;
  *) echo `not a,b,c`;;
  esac
  ---------------------------------------------------------------------- 
  J::
  函数
  格式如下:
  function-name()
  {
   commands
  }
  
<br>  而要调用此函数,就像在命令行下直接用命令一般。 <br>  <xmp> <br>  test1() <br>  { <br>    echo`this is fuction 1` <br>  } <br>  test2() <br>  { <br>    echo`this is fuction2` <br>  } <br>  test2 <br>  test1 <br>  ------------------------------------------------------ <br>  运行结果: <br>  this is fuction2 <br>  this is fuction1 <br>  下面是一些常用的shell例子: <br>  例1 给一批文件改名。 <br>  \ls *.c* sed `s/\(.*\).C\(.*\)/mv & \1/` │sh <br>  或者 <br>  for f in *.foo; <br>  fo <br>  base=`basename $f. foo` <br>  mv $f $base.bar <br>  done <br>  例2 将大写文件名发亮写为小心改为小安下心来文件名。 <br>  for f in *;do <br>      mv $f `echo $f│tr `[a-z] ` ][a-z] <br>  done <br>  <br>                                         <div align=right style="margin:3px 0;">
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