Show Lines Before and After Match via Grep

To also show you the lines before your matches, you can add -B to your grep. The -B 4 tells grep to also show the 4 lines before the match. Alternatively, to show the log lines that match after the keyword, use the -A parameter. In this example, it will tell grep to also show the 2 lines after the match.

1. How do you grep 5 lines before and after?
2. How do you show lines after each grep match until another specific match?
3. How do I show a few lines after grep?
4. How do I grep and show line numbers?
5. How do you get 10 lines after grep?
6. How do you grep multiple lines?
7. How do I grep next word after a match?
8. Does grep support regex?
9. What options can be used with grep command?
10. How do you use awk?
11. How do I grep last 10 lines in Linux?
12. Can grep print line numbers?
13. How do I grep a word in a directory?
14. What is awk script?

How do you grep 5 lines before and after?

Show lines before and after with grep

1. -A num. Print num lines of trailing context after each match. See also the -B and -C options.
2. -B num. Print num lines of leading context before each match. See also the -A and -C options.
3. -C [num] Print num lines of leading and trailing context surrounding each match. The default is 2 and is equivalent to -A 2 -B 2.

How do you show lines after each grep match until another specific match?

1. sed appears to be able to do this much more efficiently if a large number of files are involved. ...
2. awk is superior if Word D falls on the same line as Word A , and possibly elsewhere, eg Word A Word D\nWord D with sed will show two lines where as awk will show one.

How do I show a few lines after grep?

14 Answers

For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match. If you want the same number of lines before and after you can use -C num . This will show 3 lines before and 3 lines after.

How do I grep and show line numbers?

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 you get 10 lines after grep?

4 Answers. You can use the -B and -A to print lines before and after the match. Will print the 10 lines before the match, including the matching line itself. And if you need to print 10 lines of leading and trailing output context.

How do you grep multiple lines?

The basic grep syntax when searching multiple patterns in a file includes using the grep command followed by strings and the name of the file or its path. The patterns need to be enclosed using single quotes and separated by the pipe symbol. Use the backslash before pipe | for regular expressions.

How do I grep next word after a match?

2 methods to grep & print next word after pattern match in Linux

1. Print next word after pattern match using grep. ...
2. Print next word after pattern match. ...
3. Print everything in line after pattern match.
4. Print content between two matched pattern.
5. Print last word before pattern match using grep with lookahead.
6. Print everything in line before pattern match.

Does grep support regex?

Grep Regular Expression

GNU grep supports three regular expression syntaxes, Basic, Extended, and Perl-compatible. In its simplest form, when no regular expression type is given, grep interpret search patterns as basic regular expressions.

What options can be used with grep command?

Command-line options aka switches of grep:

• -e pattern.
• -i: Ignore uppercase vs. ...
• -v: Invert match.
• -c: Output count of matching lines only.
• -l: Output matching files only.
• -n: Precede each matching line with a line number.
• -b: A historical curiosity: precede each matching line with a block number.

How do you use awk?

awk Scripts

1. Tell the shell which executable to use to run the script.
2. Prepare awk to use the FS field separator variable to read input text with fields separated by colons ( : ).
3. Use the OFS output field separator to tell awk to use colons ( : ) to separate fields in the output.
4. Set a counter to 0 (zero).

How do I grep last 10 lines in Linux?

The tail command displays, by default, the last 10 lines of a text file in Linux. This command can be very useful when examining recent activity in log files. In the picture above you can see that the last 10 lines of the /var/log/messages file were displayed. Another option that you will find handy is the -f option.

Can grep print line numbers?

To Display Line Numbers with grep Matches

Append the -n operator to any grep command to show the line numbers. We will search for Phoenix in the current directory, show two lines before and after the matches along with their line numbers.

How do I grep a word in a directory?

You need the -d skip option added on.

1. Grep is searching inside of files. You can search recursively, as you said, if you want to search files inside of a directory.
2. By default, grep will read all files, and it detects the directories. ...
3. Searching just within the parent directory would be grep -d skip "string" ./*

What is awk script?

Awk is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling, and allows the user to use variables, numeric functions, string functions, and logical operators. ... Awk is mostly used for pattern scanning and processing.