Sync two folders using rsync command

rsync -rogpav --delete /home/me /backup/folder

I had a collection of ico files with the ext gif - these are the commands I used to fix the situation…

rename .gif .ico *.gif
find . -name '*.ico' -exec convert "{}" "{}.gif" \;
OR
mogrify -format gif *.ico
rm -f *.ico

Install a rpm package

rpm -ivh package.rpm

Divide terminal into 5 columns

ls /tmp | pr -T5 -W$COLUMNS

Copying a directory

cp -a dir1 dir2

Some date finding commands..

$ date
Mon Mar 10 23:52:08 IST 2008
$ cal
     March 2008
Su Mo Tu We Th Fr Sa
                   1
 2  3  4  5  6  7  8
 9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31

Create a boot floppy - if you still have a floppy drive?

mkbootdisk --device /dev/fd0 `uname -r`

Remove two directories and their contents recursively

rm -rf dir1 dir2

Remove a directory called ‘dir’ and contents recursively

rm -rf dir

Create a compressed iso image of cdrom on disk

mkisofs /dev/cdrom | gzip > cd_iso.gz