How to use grep command on Debian 10

1. How do I grep in Linux terminal?
2. How do I use grep to find words?
3. What is grep command used for?
4. How do I grep last 10 lines in Linux?
5. Who am I command in Linux?
6. How do you grep double quotes in Linux?
7. How do you grep special characters?
8. Does grep support regex?
9. How do I grep recursively in a directory?
10. Is command used for?
11. What is the difference between grep and find commands?
12. How does wc command work?

How do I grep in Linux terminal?

How to use the grep command in Linux

1. Grep Command Syntax: grep [options] PATTERN [FILE…] ...
2. Examples of using 'grep'
3. grep foo /file/name. Searches the file /file/name for the word 'foo'. ...
4. grep -i “foo” /file/name. ...
5. grep 'error 123' /file/name. ...
6. grep -r “192.168.1.5” /etc/ ...
7. grep -w “foo” /file/name. ...
8. egrep -w 'word1|word2' /file/name.

How do I use grep to find words?

The easiest of the two commands is to use grep's -w option. This will find only lines that contain your target word as a complete word. Run the command "grep -w hub" against your target file and you will only see lines that contain the word "hub" as a complete word.

What is grep command used for?

grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. Its name comes from the ed command g/re/p (globally search for a regular expression and print matching lines), which has the same effect.

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.

Who am I command in Linux?

whoami command is used both in Unix Operating System and as well as in Windows Operating System. It is basically the concatenation of the strings “who”,”am”,”i” as whoami. It displays the username of the current user when this command is invoked. It is similar as running the id command with the options -un.

How do you grep double quotes in Linux?

So, you have to use different approaches:

1. Use double quotes: grep "'type' => 'select'" file.
2. If you prefer needlessly complex solutions: grep "'"type"'"\ =\>\ "'"select"'" file.
3. You can always search for any single character instead of specifying the single quotes: grep '.type. => . select.' file.

How do you grep special characters?

To match a character that is special to grep –E, put a backslash ( \ ) in front of the character. It is usually simpler to use grep –F when you don't need special pattern matching.

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.

How do I grep recursively in a directory?

To recursively search for a pattern, invoke grep with the -r option (or --recursive ). When this option is used grep will search through all files in the specified directory, skipping the symlinks that are encountered recursively.

Is command used for?

The IS command discards leading and trailing blank spaces in the terminal input and converts embedded blank spaces to single blank spaces. If the text includes embedded spaces, it is composed of multiple parameters.

What is the difference between grep and find commands?

The main difference between the two is that grep is used to search for a particular string in a file whereas find is used to locate files in a directory, etc. ... Grep searches for a string within the file, where find searches the directory tree for a file name that matches the arguments on the command line.

How does wc command work?

The wc command in UNIX is a command line utility for printing newline, word and byte counts for files. It can return the number of lines in a file, the number of characters in a file and the number of words in a file. It can also be combine with pipes for general counting operations.