Linux/Snippets: Difference between revisions

Revision as of 12:59, 8 June 2013

List directory sizes

clear;   for each in $(ls) ; do du -hs "$each" ; done

Measure execution time

START=$(date +%s.%N)
command
END=$(date +%s.%N)
DIFF=$(echo "$END - $START" | bc)

find file with content

grep -iR "$PATTERN" *

show hdd power states

sudo hdparm -C /dev/sd?

Manual SSD Trim

sudo fstrim -v /

Cron SSD Trim

/etc/scripts/fstrim.sh:

#!/bin/sh
#
echo `date +"%d %b %H:%M:%S"` | tr -d '\n' >> /var/log/fstrim
/sbin/fstrim -v / >> /var/log/fstrim

/etc/cron.d/fstrim:

#
0 * * * * root /etc/scripts/fstrim.sh

remove old kernels

dpkg -l linux-* | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e [0-9] | xargs sudo apt-get --dry-run remove

@@ Line 60: / Line 60: @@
 #
 * * * * root /etc/scripts/fstrim.sh
+</pre>
+</blockquote>
+== kernel ==
+remove old kernels
+<blockquote>
+<pre>
+dpkg -l linux-* | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e [0-9] | xargs sudo apt-get --dry-run remove
 </pre>
 </blockquote>