Bash：如果第二列中的数字大于3，如何保持行距？

Question

What is the best way to keep line if number in second column (separated by space) is greater than 3?

And I MUST NOT use awk or sed! -.-

Input:

2 2 asd 132ds
1 4 sdf 234sd
1 3 gfd 654gh
1 1 rtz 543jh
1 10 uio 654iu

Output:

1 4 sdf 234sd
1 10 uio 654iu

Answer 1

使用while循环：

while read -r i j k; do [ "$j" -gt 3 ] && echo "$i $j $k"; done <file.txt

Answer 2

Using grep to filter out unwanted requirements

$ cat file
2 2 asd 132ds
1 4 sdf 234sd
1 3 gfd 654gh
1 1 rtz 543jh
1 10 uio 654iu

$ egrep -v '^[^.]+ [1-3] ' file
1 4 sdf 234sd
1 10 uio 654iu

Answer 3

使用while循环

while read line; do if [ $(echo $line|cut -d " " -f2) -gt 3 ]; then echo $line; fi; done < testfile.txt