Shell for loop exercises-equilateral triangle

[email protected] ~]# cat sanjiaoxing.sh #!/bin/bash
# Crushlinux
# 2017-04-10 Read-p "Please enter the length of the equilateral triangle one side:" Longfor ((a=1;a<=long;a++)) do echo-n "              " for ((b= $long; b>a;b--)) #控制空格输出 Do echo  -n "" Donefor C in ' seq 1 $a ' #输出所在行数相同的数字个数do echo-n "$a" donefor D in ' seq 2 $a '   #输出所在行数减一的数字个数do echo- N "$a" Doneecho ""  done[[email protected] ~]# bash sanjiaoxing.sh Please enter the length of the equilateral triangle one side: 8                     1                    222                   33333                  4444444                 555555555                66666666666               7777777777777              888888888888888

　　

Shell for loop exercises-equilateral triangle