How do I make the first 10 lines of a file read only?

How do I make the first 10 lines of a file read only?

To look at the first few lines of a file, type head filename, where filename is the name of the file you want to look at, and then press . By default, head shows you the first 10 lines of a file. You can change this by typing head -number filename, where number is the number of lines you want to see.

How do I get the first 10 lines of a file in Unix?

Type the following head command to display first 10 lines of a file named “bar.txt”:

1. head -10 bar.txt.
2. head -20 bar.txt.
3. sed -n 1,10p /etc/group.
4. sed -n 1,20p /etc/group.
5. awk ‘FNR <= 10’ /etc/passwd.
6. awk ‘FNR <= 20’ /etc/passwd.
7. perl -ne’1..10 and print’ /etc/passwd.
8. perl -ne’1..20 and print’ /etc/passwd.

How do you print the first 10 lines in Python?

How to print the first n lines of a file in Python

1. a_file = open(“file_name.txt”) Open “file_name.txt”
2. number_of_lines = 3.
3. for i in range(number_of_lines): Print the first number_of_lines lines of a_file.
4. line = a_file. readline()
5. print(line)

How to show before and after lines in grep?

Grep: show lines before and after the match in Linux You can add some additional parameters to your grep command, to search for keywords or phrases in files, to also show you the files that match before or after your match. This is especially useful if the lines before or after that match are relevant for your search queries.

How to limit the number of results returned from grep?

Another advantage with this approach is that will return no more than 10 lines even if you are using grep with the -o option. Using head returns only 2 results as desired, whereas -m2 returns 3.

How to grep for lines which contain particular words in a log file?

So in my above shell script I will split my data variable and look for hello word in abc.log so any line which contains hello word, I will print it out and similarly with world and tester as well.

What does grep only the first match mean?

-m 1 means return the first match in any given file. But it will still continue to search in other files. Also, if there are two or more matched in the same line, all of them will be displayed. You can pipe grep result to head in conjunction with stdbuf.