一、for循环
1.数字段形式
for i in {1..10} do echo $i done
for File in 1 2 3 4 5 do echo $File done
for shname in `ls *.sh` do name=`echo "$shname" | awk -F. '{print $1}'` echo $name done
for shname in `find . -type f -name "*.sh"` do name=`echo "$shname" | awk -F/ '{print $2}'` echo $name done
for((i=1;i<100;i++)) do if((i%3==0)) then echo $i continue fi done
for i in `seq 100` do if((i%3==0)) then echo $i continue fi done
二、while循环
1.while循环注意为方括号[],且注意空格
min=1 max=100 while [ $min -le $max ] do echo $min min=`expr $min + 1` done
i=1 while(($i<100)) do if(($i%4==0)) then echo $i fi i=$(($i+1)) done
MAX_RUN_NUM=8 cat cfg/res_card_partition.cfg |grep -v '^$'|grep -v "#" | grep -v grep |while read partition do nohup sh inv_res_card_process.sh $partition >log/resCard$partition.log 2>&1 & while [ 1 -eq 1 ] do psNum=`ps -ef | grep "inv_res_card_process" | grep -v "grep" | wc -l` if [ $psNum -ge $MAX_RUN_NUM ] then sleep 5 else break fi done done
# break 命令不执行当前循环体内break下面的语句从当前循环退出. # continue 命令是程序在本循体内忽略下面的语句,从循环头开始执行