Shulou(Shulou.com)06/02 Report--

Shell script programming-output diamonds, triangles or digital pyramids (with flashing colors) according to the number of inputs

The shell script and explanation are as follows

#! / bin/bash# creates an endless loop. If you enter an error or enter the "quit" string to exit the script while truedo# and wait for the user to enter read-p, enter a positive integer not greater than 20 (enter "quit" to exit): "n # first determine whether the string is quitif [" $n "= =" quit "] then echo" you choose to exit "exit 0fi# determines whether the input is numeric or not If not, the error termination script if [[$n = ~ ^ [0-9] + $]] then: else echo "sorry you input no a number!" Exit 1fi# determines whether the input number is greater than 20, then jump out of this cycle and enter the next cycle if [$n-gt 20] then echo "the number you entered is too large, I may not be able to execute" continue# indicates that the number entered is not more than 20 Determine whether it is odd or even elif [[$n% 2-eq 1]] # determine whether it is odd then echo "you entered an odd number" echo "will display n lines of diamond" let half= (echo) / 2 let otherhalf=half-1 # echo $half for i in `seq 1$ half` do for ((j=$half) J > ibomacher -) do echo-n "done for m in `seq 1$ i` do echo-ne"\ 033 [5Trac34m*\ 033 [0m "done echo done for i in `half1 $otherhalf`do for m in `seq $i`half` do echo-n"done for ((jobless others halfwitj > = I) ) do echo-ne "\ 033 [5 34m *\ 033 [0m" done echo doneelse echo "you entered an even number" # indicates that you entered an even number not less than 20 # to determine whether the even number is less than 10 if [$n-lt 10] then for i in `seq 1$ n` do for ((jobless than n` do for j > I) ) do echo-ne "" done for m in `seq 1$ i` do echo-ne "\ 033 [1x 36m done echo done # indicates that the even number not less than 20 is not less than 10 else for i in `m 1$ n` do for ((jacks seq 1$ n` do for) ) do echo-n "" done for m in `do echo 1$ i` do echo-n "*" done echo done fifidone

You can copy and understand a wave of things directly by yourself after execution.

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