Shell script output diamond and equilateral triangle

Objective

Practice the shell to improve your logical abilities.

Script

Triangles and diamonds are implemented through several for loops, but can also be used while.

Here is the script content:

Triangle

#!/bin/bashread -p  "Please input the longs:"  longfor ((i=1;i<= $long; i++)) do     for ((j= $long; j>i;j--)   #控制空格输出     do         echo -n  " "     done     for m in  ' seq 1  $i '    #输出所在行数相同的数字个数, as in the third row, outputs 3 3    do         echo -n  "$i"           done     #for ((n=1;n<i;n++))     for n in   ' seq 2  $i '    #输出所在行数减一的数字个数, as in the third row, outputs 2 three     do                    ## This can be combined with a for loop to achieve output per line (number of rows-1) digits          echo -n  "$i "&NBSP;&NBSP;&NBSP;&NBSP;DONE&NBSP;&Nbsp;  echo  "" Done 

After the execution:

650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/78/61/wKiom1Z7OtPyCdplAAD7V8yWXAc165.jpg "title=" 1111111.jpg "alt=" Wkiom1z7otpycdplaad7v8ywxac165.jpg "/>

If you change the $i of the two for loop inside the above script to Echo-n $i "" to *, the script effect is as follows:

650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/78/61/wKiom1Z7PIGQigzCAAC2u-DQK04106.jpg "title=" 222222.jpg "alt=" Wkiom1z7pigqigzcaac2u-dqk04106.jpg "/>

Diamond

#!/bin/bashread -p  "Please input the longs:"  longfor ((i=1;i<= $long; i++))                #图形上半部分do      for ((j= $long; j>i;j--))     do         echo -n  " "     done    for m in  ' seq 1  $i '     do        echo -n   "*"     done     #for ((n=1;n<i;n++))     for  n in  ' seq 2  $i '     do         echo -n  "*"     done    echo  "" Donefor (i=2;i<= $long, i++)      #图形下半部分do     for  ((j=1;j<i;j++))      do        echo -n  " "     done    let  k= $long +1-$i         for m in  ' seq 1  $k '     do        echo -n  "*"      done    for  ((n=1;n<k;n++))      #for  n in   ' seq 2  $k '     do        echo  -n  "*"     done    echo  "" "Done

After improvement:

#!/bin/bashread -p  "Please input the longs:"  longfor ((i=1;i<= $long; i++))         #控制行数do     for (j= $long; j>i;j--)       #控制空格输出     do        echo -n   " "     done        let  "G=2*i-1"     for m in  ' seq 1  $g '         #控制 * Quantity     do        echo -n  "*"      done    echo  "" Donefor ((i=2;i<= $long; i++)          #控制行数do     for  ((j=1;j<i;j++))          #控制空格输出     do        echo - n  " "     done    let  "k=2* (long-i) +1"     for m in  " seq 1  $k '         #控制 * Quantity     do         echo -n  "*"     done     echo  "" Done

After the execution:

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/78/61/wKiom1Z7RTLiRun4AADRWz-0eH4083.jpg "title=" 1111111.jpg "alt=" Wkiom1z7rtlirun4aadrwz-0eh4083.jpg "/>

Shell script output diamond and equilateral triangle