- #LINUX FIND FILE NAME CONTAINING STRING HOW TO#
- #LINUX FIND FILE NAME CONTAINING STRING MANUAL#
Use -R if you want symbolic links found within the input directories to be followed as well. By default, the current directory will be searched. You can use the -r option to search recursively within the specified directories.
#LINUX FIND FILE NAME CONTAINING STRING MANUAL#
See man pcrepattern or PCRE online manual for documentation. $ echo 'car2 bat cod map combat' | grep -oP '\b(bat|map)\b(*SKIP)(*F)|\w+' # all digits and optional hyphen combo from the start of the line match any character, including the newline character \b restricts the match to the start/end of words.\ restricts the match to the end of word.$ restricts the match to the end of the string.^ restricts the match to the start of the string.The following reference is for Extended Regular Expressions. -P if available, this option will enable Perl Compatible Regular Expression (PCRE).-F option will cause the search patterns to be treated literally.in GNU grep, BRE and ERE only differ in how metacharacters are specified, no difference in features.
-E option will enable Extended Regular Expression (ERE). -G option can be used to specify explicitly that BRE is needed. Here's an example with line numbers and matched portions in color:īy default, grep treats the search pattern as Basic Regular Expression (BRE) $ printf 'red\nblue\ngreen\nbrown\nyellow' | grep -A2 'blue' $ printf 'hi\n\nhello\n\n\n\nbye\n' | grep -cx '' $ printf 'par value\nheir apparent\ntar-par' | grep -w 'par' $ printf 'Cat\ncut\ncOnCaT\nfour cats\n' | grep -i 'cat' $ printf 'apple\nbanana\nmango\nfig\ntango\n' | grep 'an' grep is smart enough to do the right thing in such cases. The following examples would all be suited for -F option as these do not use regular expressions. -H prefix filename for matching lines (default behavior for multiple input files) Literal search. -h do not prefix filename for matching lines (default behavior for single input file). -R like -r, but follows symbolic links as well. -r recursively search all files in the specified input folders (by default searches current directory). -s suppress error messages, useful in scripts. -q no standard output, quit immediately if match found, useful in scripts. -m N print a maximum of N matching lines. -C N print matching line and N number of lines before and after the matched line. -B N print matching line and N number of lines before the matched line. -A N print matching line and N number of lines after the matched line. -F interpret pattern as a fixed string (i.e. 
-L print filenames not matching the pattern. -l print only the filenames matching the given expression. 
-c display only the count of output lines. -n prefix line numbers for output lines. -color=auto highlight the matching portions, filenames, line numbers, etc using colors. Examples will be discussed in later sections. Common optionsĬommonly used options are shown below. The most common usage is filtering lines from the input using a regular expression (regexp). The grep command has lots and lots of features, so much so that I wrote a book about it. Its name comes from the ed command g/re/p ( globally search a regular expression and print), which has the same effect. Grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. The example_files directory has the scripts used in this chapter. #LINUX FIND FILE NAME CONTAINING STRING HOW TO#
After that, you'll learn how to locate files based on their names and other properties like size, last modified timestamp and so on. This chapter will show how to search file contents based on literal strings or regular expressions.
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