Replace all but a set of characters in a file with newline

Question

how to delete all characters in file except numbers and "." , each word (numbers/dot) should be in new line in file see example2

• the solution can be with sed or awk or ksh syntax

remark - the solution must be according to the example 2

example 1

file before edit

  192.0.22.1++0.1
  e32)5.500.5.5*kjcdr
  ##@$1.1.1.1+++jmjh
  1.1.1.1333
  33331.1.1.1
  @5.5.5.??????
  ~3de.ede5.5.5.5
  1.1.1.13444r54
  192.9.30.174
  &&^#%5.5.5.5
  :5.5.5.5@%%^^&*
  :5.5.5.5:
  **22.22.22.22
  172.78.0.1()*5.4.3.277
  3.3.3ki.3.

example 2 of file after delete all characters except numbers and "." charter , each new word will be in new line

  192.0.22.1
  0.1
  32 5.500.5.5
  1.1.1.1
  1.1.1.1333
  33331.1.1.1
  5.5.5.
  .
  5.5.5.5
  1.1.1.13444
  54
  192.9.30.174
  5.5.5.5
  5.5.5.5
  5.5.5.5
  22.22.22.22
  172.78.0.1 
  5.4.3.277
  3.3.3 .3.

Answer 1

This is a classic tr use case, so the simplest way is:

tr -cs '[:digit:].' '[\n*]' < input > output

The [:digit:]. argument specifies the characters to match (digits and dot). The [\n*] specifies the characters to replace with (replace everything with newline). The -c option inverts the first argument since we want everything except digits and dot. The -s squeezes consecutive newlines from the second string into one.

Answer 2

You can use sed to replace any unwanted character to a newline, and then grep to get rid of empty lines:

sed 's/[^0-9.]/\n/g' | grep . 

Note that the result is different from the one you posted: 32 5.500.5.5 is split to two lines, as well as the last line.

Perl solution: it splits each line on unwanted characters, and greps for nonempty lines.

perl -ne 'print "$_\n" for grep /./, split /[^0-9.]+/'

Answer 3

Here's one way with GNU sed:

sed ':a;{N;s/[^\.0-9]\+/\n/g};ba' file

Here's how it works:

1. Create a branch label;
2. Append current/next line to register;
3. Branch if not last line;
4. Replace all groups that aren't matching with newlines.

Using the branch avoids spurious newlines.

Answer 4

grep can do it:

grep -o '[0-9.]\+'