1, for loop:
Statement format:
Analyzing loop for i in
do
Loop
done
Example: multiplication table (for loop version)
#!/bin/bash
# Author: Sean Martin
# Blog: https://www.cnblogs.com/shy13138/
# Time: 2019-08-16 10:35:48
# Name: 99for.sh
# Version: v1.0
for i in {1..9};do
for j in $(seq $i);do
echo -ne "$i*$j=$((i*j)) "
done
echo ''
done
2, while circulation
Statement format:
Analyzing while loop
do
Loop
done
Example: finger-guessing game
# / bin / bash!
# Author: Sean Martin
# Blog: https://www.cnblogs.com/shy13138/
# Time: 2019-08-16 10:35:48
# the Name: caiquan.sh
# Version: v1. 0
J =. 1
the while [$ J -le. 5]
do
echo "stone 1. 2. 3. scissors cloth"
Read -p "Please punch 1-3:" I
IF [-ne. 1 -o $ I $ I - 2 -o $ I -ne NE. 3]; the then
echo "Please enter a number between 1-3"
Fi
Game = (Janken)
NUM = $ ((the RANDOM. 3%))
echo Computer Game = $ {[$ NUM]}
Case in I $
. 1)
IF [0 -eq $ NUM]; the then
echo "draw"
elif [-eq $ NUM. 1]; the then
echo "you lose"
echo" you win "
Fi ;;
esac
else
echo "you win"
Fi ;;
2)
IF [-eq $ NUM. 1]; the then
echo "draw"
elif [$ 0 -eq NUM]; the then
echo "you lose"
the else
echo "you win"
Fi; ;
3)
IF [2 -eq $ NUM]; the then
echo "draw"
elif [1 -eq $ NUM]; the then
echo "you lose"
the else
the let J ++
DONE
3, until the cycle
until the cycle while loop
Statement format:
Analyzing until loop
do
Loop
done
For example:
99 multiplication table (until version)
#!/bin/bash
# Author: Sean Martin
# Blog: https://www.cnblogs.com/shy13138/
# Time: 2019-08-16 10:35:48
# Name: 99until.sh
# Version: v1.0
i=1
until [[ $i -gt 9 ]]
do
j=1
until [[ $j -gt $i ]]
do
let "sum = $i*$j"
echo -n -e "$i*$j=$sum\t"
let "j++"
done
echo ""
let "i++"
done