To search recursively through all folders:
grep -r string *

To pipe grep results to ls:
ls -R |grep f90

To look at all of your files via more:
/bin/ls -R |more

To gain the powers of root:
sudo zsh

To change your ssh shortcuts:
/etc/hosts

See your ip address:
ifconfig

Print to file 'filename.eps' in Matlab:
print -depsc -r1200 filename

To get windows to open remotely:
xhost +
ssh -X <remote-computer>

To dump .nc datafiles:
ncdump -h filename.nc

Once in Workspace/ folder, type:
cvs checkout Shadow

Then to check back in:
cvs commit

To make, look in, or extract a tar file:
tar -cvf filename.tar folder
tar -tvf filename.tar
tar -xtvf filename.tar

To remove white around a jpg:
convert -crop 0x0 picture.jpg picture2.jpg

Smaller web pictures:
convert -density 100x100 -quality 100 -geometry 256x192 summer\ 264.jpg hale.jpg

For 4x6 scans to web:
convert -density 100x100 -quality 100 -geometry 512x384 filename.jpg newfilename.jpg

To run aaron's album, sit in directory with pictures and type
../album/album

To convert eps to jpg:
convert -density 100x100 -quality 100 -geometry 1800x1600 '*'.eps figure.jpg

For web pictures:
convert -density 100x100 -quality 100 -geometry 360x320 '*'.eps figure.jpg

For movies:
convert -rotate 90 -delay 100 *.eps myanim.gif
convert -density 100x100 -quality 100 -rotate 90 -delay 100 *.eps myanim.gif

To compile with dgesv on mathnet:
f90 -o test test.f90 -xlic_lib=sunperf

To print sideways:
mpage -2P filename  or  enscript -2rg filename

To change permissions:
chmod og-xrw *filename* (makes available only to you)
chmod 755 *filename* (makes readable to everyone)
chmod 644 *filename* (makes available only to you as well)

Result for chmod should look like:
drxw------ if it's private, i.e. no looking or writing.

drxwrx-rx- if it's public but not changeable.

drxwr--r-- if it's public but you don't want others to execute it (if its
a program for instance)