网站开发专业简历模板,青岛网站排名提升,汕头网页网站制作,合肥做网站价格是多少命令是双向选择语句#xff0c;当用户执行脚本时如果不满足if后的表达式也会执行else后的命令#xff0c;所以有很好的交互性。其结构为#xff1a; if expression1 then command … command else command … command fi vim ifelse_exam.sh
#ifelse_exam.sh
#!/bin/bashec…命令是双向选择语句当用户执行脚本时如果不满足if后的表达式也会执行else后的命令所以有很好的交互性。其结构为 if expression1 then command … command else command … command fi vim ifelse_exam.sh
#ifelse_exam.sh
#!/bin/bashecho Please input the file which you want to delete:
read fileread -p Please input the file which you want to delete: fileif rm -f $file
thenecho Delete the file $file sucessfully!
elseecho Delete the file $file failed!
fivim ifelse_exam1.sh
# ifelse_exam1: input a file name and test the file exist or not.
#!/bin/bash
if [ ! -e $1 ]
thenecho file $1 do not exist.exit 1
elseecho file $1 exits.
fivim ifelse_exam2.sh
#ifelse_exam2.sh
#!/bin/bash
if [ $1 ]
then echo What you input is not null!if [ -e $1 ]thenecho The file $1 is existence !elseecho The file $1 is not existence !fi
elseecho what you input is null!
fivim ifelse_exam3.sh
#!/bin/bash
# script to determine a letter grade from a test score#提示用户输入分数0100
echo Please Input a integer(0-100):
read score#判断学生的分数类别
if [ $score -lt 0 -o $score -gt 100 ]
thenecho The score what you input is not integer or the score is not in (0-100).
elseif [ $score -ge 90 ]thenecho The grade is A!elseif [ $score -ge 80 ]thenecho The grade is B!elseif [ $score -ge 70 ]thenecho The grade is C!elseif [ $score -ge 60 ]thenecho The grade is D!elseecho The grade is E!fifififi
fi# vim love.sh
#!/bin/bash
read -p 请输入你是否爱我我爱你我不爱你 loveif [ 我爱你 $love ]
thenecho 我也爱你
elseecho 我也不爱你
fi# chmod x love.sh
# ./love.sh
