To search multiple files with the grep command, insert the filenames you want to search, separated with a space character. The terminal prints the name of every file that contains the matching lines, and the actual lines that include the required string of characters. You can append as many filenames as needed.
How do I grep a file in Linux?
How to use the grep command in Linux
- Grep Command Syntax: grep [options] PATTERN [FILE…] …
- Examples of using ‘grep’
- grep foo /file/name. …
- grep -i “foo” /file/name. …
- grep ‘error 123’ /file/name. …
- grep -r “192.168.1.5” /etc/ …
- grep -w “foo” /file/name. …
- egrep -w ‘word1|word2’ /file/name.
What is grep in Linux command?
You use the grep command within a Linux or Unix-based system to perform text searches for a defined criteria of words or strings. grep stands for Globally search for a Regular Expression and Print it out.
What is grep command in Linux with examples?
The grep filter searches a file for a particular pattern of characters, and displays all lines that contain that pattern. The pattern that is searched in the file is referred to as the regular expression (grep stands for globally search for regular expression and print out).
How do I grep a specific 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’ .
How do I use find in Linux?
The find command is used to search and locate the list of files and directories based on conditions you specify for files that match the arguments. find command can be used in a variety of conditions like you can find files by permissions, users, groups, file types, date, size, and other possible criteria.
How do you open a file in Linux?
Following are some useful ways to open a file from the terminal:
- Open the file using cat command.
- Open the file using less command.
- Open the file using more command.
- Open the file using nl command.
- Open the file using gnome-open command.
- Open the file using head command.
- Open the file using tail command.
What is Linux awk command?
Awk is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling, and allows the user to use variables, numeric functions, string functions, and logical operators. … Awk is mostly used for pattern scanning and processing.
What is Sudo in Linux?
Sudo stands for either “substitute user do” or “super user do” and it allows you to elevate your current user account to have root privileges temporarily.
What is File command in Linux?
file command is used to determine the type of a file. .file type may be of human-readable(e.g. ‘ASCII text’) or MIME type(e.g. ‘text/plain; charset=us-ascii’). This command tests each argument in an attempt to categorize it. … The program verifies that if the file is empty, or if it’s some sort of special file.