shell while 读行

$ cat test 
1
22
33 3

• ​​while-read.sh​​

#!/bin/bash
# while-read: read lines from a file
count=0
while read; do
  printf "%d %s\n" $REPLY
  count=$(expr $count + 1)
done <$1

执行：

$ bash  wile_read.sh test
1 
22 
33 3
count:3