Grep - A Unix/Linux Command with Examples

Grep Command in Unix with Simple Examples

1. Example: “^Name” matches all lines that start with the string “Name”. ...
2. Example:“^. ...
3. Example: “\$\*” will match the lines that contain the string “$*”
4. Example: “[aeiou]” will match all lines that contain a vowel. ...
5. Examples:

1. What is grep command in Unix with examples?
2. What is grep please give an example of its usage?
3. What is grep command used for?
4. How do I grep a file in Unix?
5. How do I grep two words in Linux?
6. How do you use grep in Linux?
7. What does grep mean in Linux?
8. How do I find on Linux?
9. What does AWK do in Linux?
10. How do you grep a word in Linux?
11. What are the commands in Linux?
12. What is the difference between grep and find commands?

What is grep command in Unix with examples?

Grep is an acronym that stands for Global Regular Expression Print. Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. The text search pattern is called a regular expression. When it finds a match, it prints the line with the result.

What is grep please give an example of its usage?

The grep command is used to search text or searches the given file for lines containing a match to the given strings or words. By default, grep displays the matching lines. Use grep to search for lines of text that match one or many regular expressions, and outputs only the matching lines.

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 a file in Unix?

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 do I grep two words in Linux?

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.

How do you use grep in Linux?

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.

What does grep mean in Linux?

grep stands for Globally Search For Regular Expression and Print out. It is a command line tool used in UNIX and Linux systems to search a specified pattern in a file or group of files.

How do I find on Linux?

find is a command for recursively filtering objects in the file system based on a simple conditional mechanism. Use find to search for a file or directory on your file system. Using the -exec flag, files can be found and immediately processed within the same command.

What does AWK do in Linux?

AWK command in Linux enable a programmer to write useful programs in the form of statements defining specific patterns to be searched for in each line of the file and the action which is to be taken when a match is found within a line. AWK command in Unix is used for pattern processing and scanning.

How do you grep a word in Linux?

Search any line that contains the word in filename on Linux: grep 'word' filename. Perform a case-insensitive search for the word 'bar' in Linux and Unix: grep -i 'bar' file1. Look for all files in the current directory and in all of its subdirectories in Linux for the word 'httpd' grep -R 'httpd' .

What are the commands in Linux?

which command in Linux is a command which is used to locate the executable file associated with the given command by searching it in the path environment variable. It has 3 return status as follows: 0 : If all specified commands are found and executable.

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.