cheat:grep # To search a file for a pattern:grep<pattern><file># To perform a case-insensitive search (with line numbers):grep-in<pattern><file># To recursively grep for string <pattern> in <dir>:grep-R<pattern><dir># Read search patterns from a file (one per line):grep-f<pattern-file><file># Find lines NOT containing pattern:grep-v<pattern><file># To grep with regular expressions:grep"^00"<file># Match lines starting with 00
grep-E"[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"<file># Find IP add# To find all files that match <pattern> in <dir>grep-rnw<dir>-e<pattern># To exclude grep from your grepped output of ps:# (Add [] to the first letter. Ex: sshd -> [s]shd)psaux|grep'[h]ttpd'# Colour in red {bash} and keep all other linespsaux|grep-E--color'bash|$' tldr:grep # grep# Matches patterns in input text.# Supports simple patterns and regular expressions.# Search for a pattern within a file:grepsearch_patternpath/to/file# Search for an exact string:grep-Fexact_stringpath/to/file# Search for a pattern [R]ecursively in the current directory, showing matching line [n]umbers, [I]gnoring non-text files:
grep-RInsearch_pattern.# Use extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:grep-Eisearch_patternpath/to/file# Print 3 lines of [C]ontext around, [B]efore, or [A]fter each match:grep-C|B|A3search_patternpath/to/file# Print file name with the corresponding line number for each match:grep-Hnsearch_patternpath/to/file# Use the standard input instead of a file:catpath/to/file|grepsearch_pattern# Invert match for excluding specific strings:grep-vsearch_pattern$