With some bash scripts it can be useful to have them exit as soon as a command fails. To accomplish this have the following just after the “#!/bin/bash” line:
set -o errexit
This will cause the script to…

On my previous laptop I suffered with repeated over-heating problems whenever CPU load went high for a prolonged period. After several emergency shutdowns (performed by ACPI) I discovered the problem: cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor returned the result: “performance” Inserting the following line before the ‘exit’ line in /etc/rc.local: echo "conservative" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor resolved the problem. For all

When reading/writing a disk image using Linux tool ‘dd’ launch as follows:
dd if=/dev/sdb of=filename.img & pid=$!
this will run ‘dd’ in the background.
To see the progress:…

Search and replace in vi is both quick and simple:X,Ys/search/replace/g (where x – start line number, y – end line number. optional) One very useful feature is the ability to use parts of the search regular expression within the replace string. For example, where the selected lines contain values between 2000-2999 and all these values