How to check line number in unix for a file

But expr is lousy for getting, say, the fourth word Reading a file after nth line. I know how to read a file line by line. But don't to how to skip to a line matching a criteria and then continue reading it till the end. This is a log file. The input is a timestamp. Find the timestamp in the log file 2. Read the remaining lines one at a time till EOF. How can I do How to quickly show Nth line from the file. I used the following script but seems slower. See th line. RedHat Commands.

OpenSolaris Commands. Linux Commands. SunOS Commands. Learn more. Asked 11 years, 1 month ago. Active 9 months ago. Viewed k times. I'm sure there are many ways to do this: how can I count the number of lines in a text file?

Improve this question. Chris Smith Chris Smith 1 1 gold badge 6 6 silver badges 6 6 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Michael Mrozek Michael Mrozek How do I count the lines in a file if I want to ignore comments? I tried doing this with grep, but couldn't figure out the correct regular expression.

Gdalya I hope the following pipeline will do this no tests were perfomed : cat matlab. Probably instead of matching only spaces, you'd want to match arbitrary whitespace; for this replace the space with [[:space:]].

Dennis Williamson Dennis Williamson 6, 1 1 gold badge 29 29 silver badges 36 36 bronze badges. In escape mode, enter following command. The se nu is the shortcut for the original command, set number. This will display the line numbers in the left hand side margin of the editor. Once you have enabled the display of the line numbers, you might want to disable the them later.

You can remove the line numbers from being displayed by using the following command. The above :se nu! It toggles the line number display depending on the current state. Nano is another basic text editor in Linux, with a text based user interface.

It is probably not as feature rich as Vi , but is widely supported over many distributions. Being a very simple editor, Nano does not have the ability to display line numbers as Vi or other editors do.

The best you can do is to display the line number of the current cursor position. The above command will start the nano editor with the option to constantly display the cursor position at the bottom of the editor. You can make this option permanent by modifying the nano config file, named. Add the option set const to the file to persist. Last Updated : 18 May, Using wc command.

Using method 1. Using method 2. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Please use ide.