while语句--shell

while 命令 do 命令1 命令2 ... done

while循环计数


#!/bin/bash #while test iCounter=0 while [ $iCounter -lt 5 ] do iCounter=`expr $iCounter + 1` echo $iCounter done

使用while循环读键盘输入


#!/bin/bash #while test echo "type to terminate" echo -n "enter your most liked file:" while read FILE do echo "yeah , great file the $FILE" done

用while循环从文件中读取数据


#/bin/bash while read LINE do echo $LINE done < awktest.txt

使用IFS读文件


#/bin/bash #处理条目之间的分号等 SAVEIFS=$IFS IFS=":" while read NAME AGE NUM do echo -e "$NAME\t $AGE\t $NUM" done < awktest.txt IFS=$SAVEIFS

消除文件的#所在行


#!/bin/bash #忽略文件中的#行 INPUT_FILE="ignore.txt" if [ -s $INPUT_FILE ]; then while read LINE do case $LINE in \#*) continue ;; *) echo $LINE ;; esac done < $INPUT_FILE else echo "please input a file which is not empty" exit 1 fi

标签:Linux, Shell

评论已关闭