03.Bash Loop

Table of Contents

for 循环

for variable in list; do
    commands
done

 $ for i in (1 2 3);do echo "index: $i" ; done   # for in 循环
 > index: 1
 > index: 2
 > index: 3

for ((expression1; expression2; expression3)); do
  commands
done

 $ for((i=0; i<3; i+=1)); do echo "line:$i";done # for 循环
 > line:0
 > line:1
 > line:2

while 循环

while condition; do                              # while 循环
  commands
done

 $ i=0; while [ $i -lt 3 ]; do echo "line:$i"; i=$((i+1)); done
 > line:0
 > line:1
 > line:2