networktestinggenius.tk

line='inet 192.168.0.255'
echo "$line" | grep  "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"

cat file.html | grep 'http://ex[a-zA-Z.-]*/[a-zA-Z.-]*/[a-zA-Z.,-]*'

Files will starts with - and directiores d use caret symbol to seprate both

Syntax of splitand trim based on ur language

If u want to do for multiples times use -r for recursive. 

^ (Caret)        =    match expression at the start of a line, as in ^A.
$ (Question)     =    match expression at the end of a line, as in A$.
\ (Back Slash)   =    turn off the special meaning of the next character, as in \^.
[ ] (Brackets)   =    match any one of the enclosed characters, as in [aeiou].
                      Use Hyphen "-" for a range, as in [0-9].
[^ ]             =    match any one character except those enclosed in [ ], as in [^0-9].
. (Period)       =    match a single character of any value, except end of line.
* (Asterisk)     =    match zero or more of the preceding character or expression.
\{x,y\}          =    match x to y occurrences of the preceding.
\{x\}            =    match exactly x occurrences of the preceding.
\{x,\}           =    match x or more occurrences of the preceding.

    grep '^From: ' /usr/mail/$USER             {list your mail}
    grep '[a-zA-Z]'         {any line with at least one letter}
    grep '[^a-zA-Z0-9]        {anything not a letter or number}
    grep '[0-9]\{3\}-[0-9]\{4\}' {999-9999, like phone numbers}
    grep '^.$'               {lines with exactly one character}
    grep '"smug"'                 {'smug' within double quotes}
    grep '"*smug"*'            {'smug', with or without quotes}
    grep '^\.'         {any line that starts with a Period "."}
    grep '^\.[a-z][a-z]' {line start with "." and 2 lc letters}
    

Output control of grep:
  -m, --max-count=NUM       stop after NUM matches
  -b, --byte-offset         print the byte offset with output lines
  -n, --line-number         print line number with output lines
      --line-buffered       flush output on every line
  -H, --with-filename       print the file name for each match
  -h, --no-filename         suppress the file name prefix on output
      --label=LABEL         use LABEL as the standard input file name prefix
  -o, --only-matching       show only the part of a line matching PATTERN
  -q, --quiet, --silent     suppress all normal output
      --binary-files=TYPE   assume that binary files are TYPE;
                            TYPE is 'binary', 'text', or 'without-match'
  -a, --text                equivalent to --binary-files=text
  -I                        equivalent to --binary-files=without-match
  -d, --directories=ACTION  how to handle directories;
                            ACTION is 'read', 'recurse', or 'skip'
  -D, --devices=ACTION      how to handle devices, FIFOs and sockets;
                            ACTION is 'read' or 'skip'
  -r, --recursive           like --directories=recurse
  -R, --dereference-recursive  likewise, but follow all symlinks
      --include=FILE_PATTERN  search only files that match FILE_PATTERN
      --exclude=FILE_PATTERN  skip files and directories matching FILE_PATTERN
      --exclude-from=FILE   skip files matching any file pattern from FILE
      --exclude-dir=PATTERN  directories that match PATTERN will be skipped.
  -L, --files-without-match  print only names of FILEs containing no match
  -l, --files-with-matches  print only names of FILEs containing matches
  -c, --count               print only a count of matching lines per FIL