How would you print just the 10th line of a file?
For example, assume that file.txt has the following content:
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
Your script should output the tenth line, which is:
Line 10
Hint:
1. If the file contains less than 10 lines, what should you output?
2. There's at least three different solutions. Try to explore all possibilities.
1. If the file contains less than 10 lines, what should you output?
2. There's at least three different solutions. Try to explore all possibilities.
解法：
awk '
{
if(NR==){
print $
}
}
' < file.txt
过程中忘了重定向文件
awk '
{
a++;
if(a == ){
print $;
}
}
' < file.txt
不使用NR
awk '
{
a++;
if(a == ){
b = $;
}
}
END{
if(a >= ){
print b;
}
}
' < file.txt