Using the GREP command in Linux with examples

15 Practical Grep Command Examples In Linux / UNIX

1. Search for the given string in a single file. ...
2. Checking for the given string in multiple files. ...
3. Case insensitive search using grep -i. ...
4. Match regular expression in files. ...
5. Checking for full words, not for sub-strings using grep -w. ...
6. Displaying lines before/after/around the match using grep -A, -B and -C.

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

What is grep command in Linux 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 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.

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.

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.

What is difference between grep and Egrep?

grep and egrep does the same function, but the way they interpret the pattern is the only difference. Grep stands for "Global Regular Expressions Print", were as Egrep for "Extended Global Regular Expressions Print". ... The grep command will check whether there is any file with .

What is the use of awk in Linux?

Awk is a utility that enables a programmer to write tiny but effective programs in the form of statements that define text patterns that are to be searched for in each line of a document and the action that is to be taken when a match is found within a line. Awk is mostly used for pattern scanning and processing.

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.

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.

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 Su and Sudo?

Both su and sudo elevate privileges assigned to the current user. The main difference between the two is that su requires the password of the target account, while sudo requires the password of the current user. ... By doing so, the current user is only granted privileged for the specified command.