每隔十秒种echo a
while :
do
echo a
sleep 10
done
检查filename是否存在 若存在则OK 若空则一直echo "nothing"
#!/bin/bash
while :
do
sleep 1
if [ -e filename ]
then
echo "filename is ok "
exit
else
echo "nothing"
fi
done
while read 用法 测试
ls -lrt > l.dat
while read k1 k2 k3 k4
do
echo "$k1 -- $k2 ## $k3 @@ $k4"
done < l.dat
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