How can I get line after 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.
How do I grep inside a file?
The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we’re searching for and finally the name of the file (or files) we’re searching in. The output is the three lines in the file that contain the letters ‘not’.
How does The egrep command print the string?
Instead of printing the entire line that contains the search string, you can use the egrep command to print the string itself. The string will be printed the number of times it appears in the specified file. In this example, I am looking up for the word “This” in my file.
Is there a way to print line numbers in grep?
However, there doesn’t seem to be a way to print the line number ( grep -n) and not the match or line itself. I can use another regex to extract the line numbers, but I want to make sure grep cannot do it by itself. grep -no comes closest, I think, but still displays the match.
How can I use grep instead of egrep?
Try this: egrep: Grep will work with extended regular expression. w : Matches only word/words instead of substring. o : Display only matched pattern instead of whole line. i : If u want to ignore case sensitivity. You could translate spaces to newlines and then grep, e.g.: Just awk, no need combination of tools.
Which is grep program prints the matching lines?
By default, grep prints the matching lines. In addition, two variant programs egrep and fgrep are available. egrep is the same as grep -E. fgrep is the same as grep -F. Direct invocation as either egrep or fgrep is deprecated, but is provided to allow historical applications that rely on them to run unmodified.