Sort contents of a file and remove repeated lines

sort file.txt | uniq

Restoring a backup created by the dump command.

restore -if home_backup.bak

This shell script will create a build of a firefox extension in linux. This is created according to my details(eg, the guid has @binnyva.com in it) - but you can modify it and use it yourself.

app=$1
folder=$2

if [ $# -eq 0 ] ; then
	echo “Useage: sh build.sh  []”

elif [ $# -eq 1 ] ; then
	folder=”$1@binnyva.com/”
fi

rm $app.xpi
cp -r $folder temp
cd temp
rm -rf .git

zip -r $app.xpi .>/dev/null
mv $app.xpi ..
cd ..
rm -rf temp
echo “Built $app successfully”

Show all deb packages installed on the system

dpkg -l

Make a incremental backup of directory ‘/home/binnyva’

dump -1aj -f home.bak /home/binnyva/

Make a full backup of directory ‘/home’

dump -0aj -f home.bak /home

This command removes all the even lines from the file given as the argument

cat example.txt|awk 'NR%2==1'

Show specials attributes

lsattr

Use this code to force a download of any type of content with PHP

header("Content-type:application/octect-stream");
header('Content-Disposition: attachment; filename=filename_' . date('Y-m-d') . '.sql');
print "Hello World";

Makes a file immutable - it can not be removed, altered, renamed or linked

chattr +i file