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  * LINUX BASICS Public Wiki by Over and LiPo: [[http://wiki.li-on.cz/|http://wiki.li-on.cz/]]

  * A lot of interesting and useful commands and info for Linux machine [BASH positive] - to be rewritten to Doc:

[[https://over23.github.io/r00t_l4b/useful_linux.html|https://over23.github.io/r00t_l4b/useful_linux.html]]

===== test machine and scripts =====
[[test questions]]

[[broken machine]]

===== parse IRC logs only for http - example =====

<code>
  grep -A 2 http ~/irclogs/freenode/#labka.log | uniq | grep -v -e "-!-"> ~/grep_irssi_http2.txt
</code>

===== transform Czech and other diacritics to pure ascii =====

<code>
$ cat pismenka1.txt | iconv -f utf8 -t ascii//TRANSLIT//IGNO                                                                                       RE> ascii.txt
</code>

===== invert text to reverse [whatever = revetahw] =====

<code>
$ echo "whatever" | rev
</code>

===== get me emails from gmail - fokin dangerous!!! =====

<code>
curl -u "email":"passwd" --silent "https://mail.google.com/mail/feed/atom" | perl -ne 'print "\t" if /<name>/; print "$2\n" if /<(title|name)>(.*)</1>/;' | awk -v FS="(<fullcount>|</fullcount>)" '{print $2}'
</code>

  * get me emails from gmail
  * parse only number of new emails there

===== used swap space =====

<code>
for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2" " $3}END{print ""}' $file; done | sort -k 2 -n -r | less
</code>

===== change fish to bash =====

<code>
usermod -s /usr/bin/fish username
</code>

====== Tools ======

  * nikto
  * sqlmap
  * [[https://www.owasp.org/index.php/ZAP|https://www.owasp.org/index.php/ZAP]]

  * files over 50Megs

find . -type f -size +50000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

  * find and kill some running process

kill `ps aux | grep -F 'myServer' | grep -v -F 'grep' | awk '{ print $2 }'`

====== OpenVPN ======

  * [[https://www.howtoforge.com/tutorial/how-to-install-openvpn-on-centos-7/|https://www.howtoforge.com/tutorial/how-to-install-openvpn-on-centos-7/]]

{{  :project:siroky_vtip.jpg?800}}

====== FFMPEG convert script ======
  #!/bin/bash -x
  for f in *.mp4
  do
    soubor="/Users/pavouk/Movies/xxx/$f"
    soubor2="/Users/pavouk/Movies/xxx_h265/$f"
    /usr/local/bin/ffmpeg -i ${soubor} -c:v libx265 -preset medium -codec:a aac -strict experimental -b:a 128k ${soubor2}
  done

====== Get a rid of spaces in dir ======
  for f in *\ *; do mv "$f" "${f// /_}"; done