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Use sed to filter text, this is very useful.

by

This sed sample will filter out all HTML opening and closing tags in HTML

sed -e 's/<[^>]*>//g' blog.txt

This is an example of the usage of this one-liner.

4.4 Sun Nov 11 jason@Yog-Sothoth 0: $ sed -e 's/<[^>]*>//g' index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
	Securitron GNU/Linux pages.
 
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-16570816-2']);
  _gaq.push(['_trackPageview']);
 
  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
 
<?php
    include("menu.php");
?>

replace all newlines with a newline and a tab character.

cat index.php | perl -pe 's/\n/\n\t/'

Converting a comma delimited file to newline delimited. Using sed to perform the conversion.
https://securitronlinux.com/uncategorized/converting-a-comma-delimited-file-to-newline-delimited/.

Find all instances of a word in a text file with egrep.

4.4 Sun Nov 11 jason@Yog-Sothoth 0: $ egrep 'option' < index.php
<option value="0" selected>Image number: 1.</option>
<option value="1">Image number: 2.</option>
<option value="2">Image number: 3.</option>
<option value="3">Image number: 4.</option>
<option value="4">Image number: 5.</option>
<option value="5">Image number: 6.</option>
<option value="6">Image number: 7.</option>

Find and replace the word option with the word number.

4.4 Sun Nov 11 jason@Yog-Sothoth 0: $ sed "s/\option/number: /gi;" index.php
<form action="index.php" method="GET">
<select name="img" size="1">
<number:  value="0" selected>Image number: 1.</number: >
<number:  value="1">Image number: 2.</number: >
<number:  value="2">Image number: 3.</number: >
<number:  value="3">Image number: 4.</number: >
<number:  value="4">Image number: 5.</number: >
<number:  value="5">Image number: 6.</number: >
<number:  value="6">Image number: 7.</number: >
</select>
<button type="submit">Submit</button>
</form>

This is not using cat.

Print numeric permissions for all files in a directory.

4.4 Sun Nov 11 jason@Yog-Sothoth 0: $ find . -printf "%m:%f\n" | sed "s/:/ - /gi;"
777 - .
777 - yadex_15172.c
777 - tank.sh
777 - utmp.c
777 - my.c
777 - iBoot.iso
777 - time.c
777 - my_linux_system.php
777 - my2.c
777 - encode.sh
777 - index.php
777 - index(2).php
777 - myftp.c
777 - linux_configs.php
777 - tiny.asm
777 - program.c
777 - xvid.sh
777 - syscall.c
777 - x11.c

This also works as well.

alias cls="ls -lha --color=always -F --group-directories-first |awk '{k=0;s=0;for(i=0;i<=8;i++){;k+=((substr(\$1,i+2,1)~/[rwxst]/)*2^(8-i));};j=4;for(i=4;i<=10;i+=3){;s+=((substr(\$1,i,1)~/[stST]/)*j);j/=2;};if(k){;printf(\"%0o%0o \",s,k);};print;}'"

Source.

https://stackoverflow.com/a/50686667.

This is the output this will give you.

4.4 Sun Nov 11 jason@Yog-Sothoth 0: $ cls
0200 total 22M
0777 drwxrwxrwx+  2 jason jason 4.0K Dec 24  2013 ./
0755 drwxr-xr-x+ 36 jason jason 4.0K Nov  2 10:10 ../
0777 -rwxrwxrwx   1 jason jason  250 Feb 12  2011 encode.sh*
0777 -rwxrwxrwx   1 jason jason  22M Feb  7  2011 iBoot.iso*
0777 -rwxrwxrwx   1 jason jason 1.7K Feb 27  2011 index(2).php*
0777 -rwxrwxrwx   1 jason jason 2.7K Feb 21  2011 index.php*
0777 -rwxrwxrwx   1 jason jason  51K Feb 20  2011 linux_configs.php*
0777 -rwxrwxrwx   1 jason jason 1.8K Sep 20  2016 my2.c*
0777 -rwxrwxrwx   1 jason jason  177 Sep 20  2016 my.c*
0777 -rwxrwxrwx   1 jason jason 1.9K Feb 12  2012 myftp.c*
0777 -rwxrwxrwx   1 jason jason  42K Feb 20  2011 my_linux_system.php*
0777 -rwxrwxrwx   1 jason jason 1.2K Jan 31  2011 program.c*
0777 -rwxrwxrwx   1 jason jason  471 Aug 30  2009 syscall.c*
0777 -rwxrwxrwx   1 jason jason  349 Mar  1  2011 tank.sh*
0777 -rwxrwxrwx   1 jason jason  313 Jan 19  2011 time.c*
0777 -rwxrwxrwx   1 jason jason 1.2K Mar 11  2011 tiny.asm*
0777 -rwxrwxrwx   1 jason jason  866 Feb 24  2011 utmp.c*
0777 -rwxrwxrwx   1 jason jason 1.8K Mar 11  2011 x11.c*
0777 -rwxrwxrwx   1 jason jason  141 Feb 23  2011 xvid.sh*
0777 -rwxrwxrwx   1 jason jason  136 Feb 17  2011 yadex_15172.c*

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