grep examples

1. What is grep command with example?
2. How do I use grep to find words?
3. How use grep command in Unix with example?
4. How do I grep to a file?
5. What is grep command?
6. How do I grep two words in Linux?
7. What is grep equivalent in Windows?
8. Why does grep take so long?
9. How do I grep one word in Linux?
10. What is difference between grep and Egrep?
11. How do you grep sentences in Linux?
12. How do I grep a log in Linux?

What is grep command with example?

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.

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.

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:

How do I grep to a file?

If you want to "clean" the results you can filter them using pipe | for example: grep -n "test" * | grep -v "mytest" > output-file will match all the lines that have the string "test" except the lines that match the string "mytest" (that's the switch -v ) - and will redirect the result to an output file.

What is grep command?

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.

What is grep equivalent in Windows?

The findstr command is a Windows grep equivalent in a Windows command-line prompt (CMD). In a Windows PowerShell the alternative for grep is the Select-String command.

Why does grep take so long?

There are many reasons why your process could be slow, heavy load on the disk, a slow nfs if you use it, extremely long lines to parse, ... without more information on the input file and the system you are running this on, it is hard to say why it is so slow.

How do I grep one word 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 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 .

How do you grep sentences in Linux?

grep command examples in Linux and Unix

1. Search any line that contains the word in filename on Linux: grep 'word' filename.
2. Perform a case-insensitive search for the word 'bar' in Linux and Unix: grep -i 'bar' file1.

How do I grep a log in Linux?

For searching files, the command syntax you use is grep [options] [pattern] [file] , where “pattern” is what you want to search for. For example, to search for the word “error” in the log file, you would enter grep 'error' junglediskserver. log , and all lines that contain”error” will output to the screen.