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Grep is a command-line utility used in Unix and Unix-like operating systems to look for patterns in text files and command output. Its name stands for “Global Regular Expression Print.”
Basic syntax:
> Pattern: The text pattern you want to search for. It can be a simple string or a regular expression.
> [file …]: Optional parameter that specifies the file or files in which to search. If not provided, grep reads from standard input.
Examples:
> Ignores case distinctions in both the search model and input files.
grep -i "hello" file.txt> Reverses the direction of matching by selecting mismatched lines.
grep -v "error" file.txt> Prefixes each output line with the line number based on 1 within the input file.
grep -n "pattern" file.txt> Recursively search the listed subdirectories.
grep -r "pattern" /path/to/directory> It suppresses normal output; instead, it prints a corresponding line count for each input file.
grep -c "pattern" file.txt> Suppresses normal output and prints the name of each input file from which normal output would have been printed.
grep -l "pattern" *> Selects only rows containing matches that form whole words.
grep -w "word" file.txt> It interprets the model as an extended regular expression (ERE).
grep -E "pattern1|pattern2" file.txt> Prints a number of context lines after the corresponding lines.
grep -A 3 "pattern" file.txt> Print a number of context rows before the corresponding rows.
grep -B 2 "pattern" file.txt> Highlights the matching text.
grep - color=auto "pattern" file.txtFor more detailed information, you can refer to the grep manual by running man grep in your terminal. These usage possibilities make grep a versatile tool for searching and manipulating text files.
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