====== BASH ======
===== STAZENI A ROZBALENI ONE-LINER =====
<code bash>
$ gzip -d < <(wget -q -O - http://list.iblocklist.com/?list=bt_level1&fileformat=p2p&archiveformat=gz) > bt_level1
</code>
[ https://www.gnu.org/software/bash/manual/bash.html#Process-Substitution ]

===== SERAZENI PODLE VYSKYTU =====
===== ANALYZA LOGU / MESSAGES =====
<code bash>
$ sudo cut --complement -d' ' -f 1-4 /var/log/messages-20140330| uniq -c -d|sort -g
</code>

===== VALIDACE DESKTOP FILES =====
<code bash>
$ find ~/.local/share/applications/ -type f -exec desktop-file-validate {} \;
</code>

===== POCET ARG =====
<code bash>
$ echo 0 1 $#
</code>

===== VSECHNY ARG =====
<code bash>
ARGS="$@"
</code>

===== RETURN LAST STATUS =====
<code bash>
$ $?
$ cmd && echo "success" || echo "error"
</code>

===== PIPE RETURN STATUS =====
<code bash>
FIGL = ${PIPESTATUS[0]}
./generate-conf.pl -f 01-conf.conf -i -o | while read line; do
  echo "`date`   ${line}" >> generate-conf.log;
done
if [ "${PIPESTATUS[0]}" == 1 ]; then
  echo "Generate Error!";
  exit;
fi

echo "Generate successfull"
</code>

===== EXIT STATUS =====
<code bash>
$ exit 0-255[int,0=success]
</code>

===== KEEP 2 LAST NEW SUBDIRECTORIES =====
<code bash>
find /tmp -maxdepth 1 -mindepth 1 -type d -printf '%T@ %p\n' | sort -nk1| head -n -2| cut -d\\  -f2-
</code>

<WRAP info>
NOTE: //maxdepth// and //mindepth// in
<code>
find /tmp -maxdepth 1 -mindepth 1 ...
</code>

It's kinda hack to get rid of parent directory [ "/tmp" here ].
</WRAP>

<WRAP info>
NOTE: usage of //head// instead of //tail//
<code>
head -n -2
</code>
this way we keep always 2 in case of less subdirectories.
</WRAP>