How do I print over a line in 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 you grep all lines containing strings?

When searching for a string, grep will display all lines where the string is embedded in larger strings. To return only those lines where the specified string is a whole word (enclosed by non-word characters), use the -w ( or –word-regexp ) option.

Which command is used to display a line of text?

echo command in linux is used to display line of text/string that are passed as an argument . This is a built in command that is mostly used in shell scripts and batch files to output status text to the screen or a file.

How do you grep 2 patterns at a time?

How do I grep for multiple patterns?

1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
4. Another option to grep two strings: grep ‘word1\|word2’ input.

What does grep use to match lines in a file?

grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given PATTERN. By default, grep prints the matching lines. In addition, two variant programs egrep and fgrep are available.

How do we go to the start of a line?

To navigate to the beginning of the line in use: “CTRL+a”. To navigate to the end of the line in use: “CTRL+e”.

Which command is used for displaying the beginning of a file?

head command
The head command is a core Linux utility used to view the very beginning of a text file.