How do I grep from a specific line number?

How do I grep from a specific line number?

The -n ( or –line-number ) option tells grep to show the line number of the lines containing a string that matches a pattern. When this option is used, grep prints the matches to standard output prefixed with the line number. The output below shows us that the matches are found on lines 10423 and 10424.

How do I grep the last pattern of a file?

6 Answers

1. Print last occurence of x (regex): grep x file | tail -1.
2. Alternatively: tac file | grep -m1 x.
3. Print file from first matching line to end: awk ‘/x/{flag = 1}; flag’ file.
4. Print file from last matching line to end (prints all lines in case of no match): tac file | awk ‘! flag; /x/{flag = 1};’ | tac.

How do I see the last line of a file in bash?

To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file.

How to grep a specific line of a file?

Normally you can’t do this with grep but you can use other tools. AWK was already mentioned but you can also use sed, like this: Sed utility works on each line individually, running specified commands on each of them. You can have multiple commands, specifying several -e options.

How are line numbers printed in grep-N?

Line numbers are printed with grep -n: grep -n pattern file.txt To get only the line number (without the matching line), one may use cut: grep -n pattern file.txt | cut -d : -f 1

Can a grep be used to filter a file?

But it can certainly be used to filter a file out to another file, as illustrated above. The -o parameter makes grep only output the matching part of the line, which is what you want. Note that if there are several occurrences of on line, it prints the portion of the line that starts with the rightmost occurrence of it.

What’s the best way to limit the output of grep?

Limit grep Output to a Fixed Number of Lines. Individual files, such as log files, can contain many matches for grep search patterns. Limit the number of lines in the grep output by adding the -m option and a number to the command.