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grep is a command-line utility for searching plain-text data sets for lines matching a regular expression and by default reporting matching lines on standard output. tree is a command-line utility that recursively lists files found in a directory tree, indenting the filenames according to their position in the file hierarchy.
grep is a command-line utility for searching plaintext datasets for lines that match a regular expression.Its name comes from the ed command g/re/p (global regular expression search and print), which has the same effect.
/S Searches for matching files in the current directory and all subdirectories. /I Specifies that the search is not to be case-sensitive. /X Prints lines that match exactly. /V Prints only lines that do not contain a match. /N Prints the line number before each line that matches. /M Prints only the filename if a file contains a match.
He later added this capability to the Unix editor ed, which eventually led to the popular search tool grep's use of regular expressions ("grep" is a word derived from the command for regular expression searching in the ed editor: g/re/p meaning "Global search for Regular Expression and Print matching lines"). [15]
Search in files: Perform search (and possibly replace) in multiple files on disk, for example on a sub-directory and recursively all the directories below it. Similar to grep . Key bindings
Here, the first line uses a shebang to indicate which interpreter should execute the rest of the script, and the second line makes a listing with options for file format indicators, columns, all files (none omitted), and a size in blocks.
-g: Highlight just the current match of any searched string.-i: Search case-insensitively.-m: Show more detailed prompt, including file position.-N: Show line numbers (useful for viewing source code).-x3: Set tabstops (the number of columns per hard tab character) to the specified number (3, in this example) (useful for viewing source code).
perl -0777 -ne ' print "$.: doubled $_\n" while /\b(\w+)\b\s+\b\1\b/gi ' Find Palindromes in /usr/dict/words; perl -lne ' print if $_ eq reverse ' /usr/dict/words in-place edit of *.c files changing all foo to bar; perl -p -i.bak -e ' s/\bfoo\b/bar/g ' *.c Many one-liners are practical. For example, the following Perl one-liner will reverse all ...