Top 5 uses of GREP command in Linux

Here are the top 5 uses of the 'grep' command.

• How to exclude the parameter/search string? ...
• Count the occurrence of a string. ...
• How to search in the tar(zip) file. ...
• How to get the line before and after the searched string? ...
• BONUS and the Bumper One, How the search a string in all file in the directory.

1. What is the use of grep command in Linux?
2. What options can be used with grep command?
3. What is grep please give an example of its usage?
4. How use grep command in Unix with example?
5. What are the commands in Linux?
6. What GREP means?
7. How do I grep two words in Linux?
8. How do you grep special characters?
9. What is the use of awk command in Linux?
10. Is command used for?
11. What is difference between grep and Egrep?
12. Who am I command in Linux?

What is the use of grep command in Linux?

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. The grep command is handy when searching through large log files.

What options can be used with grep command?

Command-line options aka switches of grep:

• -e pattern.
• -i: Ignore uppercase vs. ...
• -v: Invert match.
• -c: Output count of matching lines only.
• -l: Output matching files only.
• -n: Precede each matching line with a line number.
• -b: A historical curiosity: precede each matching line with a block number.

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.

How use grep command in Unix with example?

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:

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 GREP means?

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 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 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.

What is the use of awk command in Linux?

Awk is mostly used for pattern scanning and processing. It searches one or more files to see if they contain lines that matches with the specified patterns and then performs the associated actions. Awk is abbreviated from the names of the developers – Aho, Weinberger, and Kernighan.

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 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 .

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.