Posts Tagged ‘specific’

How to use find command to find files created on a specific date , Find files with specific size on GNU / Linux

Monday, October 16th, 2017

How to use find command to find files created on a specific date on GNU / Linux?


The easiest and most readable way but not most efficient ) especially for big hard disks with a lot of files not the best way) to do it is via:


find ./ -type f -ls |grep '12 Oct'


Example: To find all files modified on the 12th of October, 2017:

find . -type f -newermt 2017-10-12 ! -newermt 2017-10-13

To find all files accessed on the 29th of september, 2008:

$ find . -type f -newerat 2015-09-29 ! -newerat 2015-09-30

Or, files which had their permission changed on the same day:

$ find . -type f -newerct 2015-09-29 ! -newerct 2015-09-30

If you don't change permissions on the file, 'c' would normally correspond to the creation date, though.


Another more cryptic way but perhaps more efficient  to find any file modified on October 12th,2017,  would be with below command:


find . -type f -mtime $(( ( $(date +%s) – $(date -d '2017-10-12' +%s) ) / 60 / 60 / 24 – 1 ))




You could also look at files between certain dates by creating two files with touch

touch -t 0810010000 /tmp/f-example1
touch -t 0810011000 /tmp/f-example2

This will find all files between the two dates & times of the 2 files /tmp


find / -newer /tmp/f-example1 -and -not -newer /tmp/f-exampl2


How to Find Files with a certain size on GNU / Linux?


Lets say you got cracked and someone uploaded a shell php file of 50296 bytes a , that's a real scenario that just happened to me:

root@pcfreak:/var/www/blog/wp-admin/js# ls -b green.php 
root@pcfreak:/var/www/blog/wp-admin/js# ls -al green.php 
-rw-r–r– 1 www-data www-data 50296 окт 12 02:27 green.php

root@pcfreak:/home/hipo# find /var/www/ -type f -size 50296c -exec ls {} \;


Converting .crt .cer .der to PEM, converting .PEM to .DER and convert .PFX PKCS#12 (.P12) to .PEM file using OpenSSL

Friday, September 1st, 2017


These commands allow you to convert certificates and keys to different formats to make them compatible with specific types of servers or software. For example, you can convert a normal PEM file that would work with Apache to a PFX (PKCS#12) file and use it with Tomcat or IIS.

  • Convert a DER file (.crt .cer .der) to PEM


    openssl x509 -inform der -in certificate.cer -out certificate.pem
  • Convert a PEM file to DER


    openssl x509 -outform der -in certificate.pem -out certificate.der
  • Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM


    openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes

    You can add -nocerts to only output the private key or add -nokeys to only output the certificates.

  • Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)


    openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key \
    -in certificate.crt -certfile CACert.crt

Заповеди Блаженства (на Церковнослаянском языке, На Български and in English)

Tuesday, November 10th, 2015

Заповеди Блаженства (ТК Союз)


На церковнославянском языке по Мф 5, 3-11 

  1. Блажени нищии духом, яко тех есть Царствие Небесное
  2. Блажени плачущии, яко тии утешатся
  3. Блажени кротцыи, яко тии наследят землю
  4. Блажени алчущии и жаждущии правды, яко тии насытятся
  5. Блажени милостивии, яко тии помиловани будут
  6. Блажени чистии сердцем, яко тии Бога узрят
  7. Блажени миротворцы, яко тии сынове Божии нарекутся
  8. Блажени изгнани правды ради, яко тех есть Царствие Небесное
  9. Блажени есте, егда поносят вам, и ижденут, и рекут всяк зол глагол на вы лжуще, Мене ради: Радуйтеся и веселитеся, яко мзда ваша многа на небесех: тако бо изгнаша пророки, иже (беша) прежде вас.

Евангелски блаженства (Български)

  1. Блажени бедните духом, защото тяхно е Царството небесно.
  2. Блажени плачещите, защото те ще се утешат.
  3. Блажени кротките, защото те ще наследят земята.
  4. Блажени гладните и жадните за правда, защото те ще се наситят.
  5. Блажени милостивите, защото те ще бъдет помилвани.
  6. Блажени чистите по сърце, защото те ще видят Бога.
  7. Блажени миротворците, защото те ще се нарекат синове Божии.
  8. Блажени изгонените заради правда, защото тяхно е Царството небесно.
  9. Блажени сте вие, когато ви похулят и изгонят, и кажат против вас лъжовно каква и да е лоша дума заради Мене. Радвайте се и веселете се, защото голяма е наградата ви на небесата.

— Библията, Евангелие от Матей 5 глава 3-12 стих

The Beautitudes – The Sermon on the Mount (English)

Blessed are the poor in spirit: for theirs is the kingdom of Heaven. (5:3)

Blessed are those who mourn: for they will be comforted. (5:4)

Blessed are the meek: for they will inherit the earth. (5:5)

Blessed are those who hunger and thirst for righteousness: for they will be filled. (5:6)

Blessed are the merciful: for they will be shown mercy. (5:7)

Blessed are the pure in heart: for they will see God. (5:8)

Blessed are the peacemakers: for they will be called children of God. (5:9)

Blessed are those who are persecuted for righteousness sake: for theirs is the kingdom of heaven. (5:10)

In verses 5:11-12, the eight Beatitudes are followed by what is often viewed as a commentary—a further clarification of the eighth one with specific application being made to the disciples. Instead of using the third-person plural "they", Jesus changes to second-person "you":[1]

Blessed are you when people insult you, persecute you and falsely say all kinds of evil against you because of me. Rejoice and be glad, because great is your reward in heaven, for in the same way they persecuted the prophets who were before you.

Richard stallman (father of free software) interview – Stallman: Google+ and Facebook mistreat their users

Thursday, July 12th, 2012


The father of free software, mr. Richard Stallman is notorious for his critical mind and software freedom activism quite well.

While checking some of his speaches and interviews, I came across another interesting, one here RMS critices and exposes the bad and evilness of fb and Google+.

Interview with Richard Stallman – Stallman: Facebook and Google+ Mistreat Their Users


People unaware of computer networks, programming, Unix and the deep computing so to say definitely didn't understand the profoundness of upcoming problems of so called "social networks". The Facebook and Google+ Mistreat Their Users video is also to be found in youtube under name Richard Stallman: Facebook IS Mass Surveillance .

Its a pity Stallman is mostly popular only among specific users like me which are already 'dubbed' into free software and have a belief that computer software should be free. Hopefully as time passes more and more people will be awakened to listen to his speeches and realize the severeness of problems, we face nowdays by simply accepting almost anything new without much privacy concerns …
If you're a free software enthusiast like me, please take the time to share the video and whistle-blow about the problem to as many non-tech pc users as possible 🙂

How to clear Squid Proxy Cache on Debian and Ubuntu

Saturday, July 16th, 2011

Squid proxy cache clear logo

It was necessery to clean up some squid cache for some proxy users on a Debian host. Until now I’ve used to run only custom build Squid server on Slackware Linux.

Thus I was curious if Debian guys were smart enough to implement a proxy cache cleaning option as an option to be passed on to squid’s init script.

Honestly I was quite suprised squid clear cache option is not there;

squid-cache:~# /etc/init.d/squid3
Usage: /etc/init.d/squid3 {start|stop|reload|force-reload|restart}

As it was not embedded into init script I still hoped, there might be some Debian way to do the proxy cache clearing, so I spend some 10 minutes checking online as well as checked in squid3‘s manual just to find there is no specific command or Debian accepted way to clean squid’s cache.

Since I couldn’t find any Debian specific, way I did it the old fashioned way 😉 (deleted directory/file structures in /var/spool/squid3/* and used squid’s -z option, to recreate the swap directories.

Here is how:

squid-cache:~# /etc/init.d/squid3 stop;
squid-cache:~# rm -Rf /var/spool/squid3/*;
squid-cache:~# squid3 -z; /etc/init.d/squid3 start

Finally I was quite amazed to realize, there was not even a crontab script to periodically clear and re-create proxy cache.

My previous experience with maintaning an office Squid proxy cache has prooved, that periodic cache clean ups are very helpful, especially to resolve issues with cached unreslovable DNS entries in the server.
Clearing up squid cache every week or something, guarantees that failure to resolve certain hosts at certain times would not stay unresolvable like forever 😉

In that manner of thougths, I decided to put the following crontab which will twice a month clear up proxy’s cache, to possibly solve some failed squid DNS issues.

squid-cache:~# crontab -u root -l > file;
echo '00 04 12,26 * * /etc/init.d/squid3 stop; rm -Rf /var/spool/squid3/*; squid3 -z; /etc/init.d/squid3 start >/dev/null 2>&1'
>> file; crontab file

By the way, implementing the squid clear cache in Debian and Ubuntu ‘s init scripts and putting a periodic proxy clear up cron, seems like a feature worthy to be proposed to the distro developers and hopefully be embbed in some of the upcoming distro releases 😉