cat >> area.f PROGRAM area c area of circle, r input from terminal DOUBLE PRECISION pi, r, A c Best value of pi for IEEE floating point pi = 3.14159265358979323846 c read r from standard input (terminal) Write(*, *) 'specify radius, e.g. 1.0 ' Read (*, *) r A = pi * r**2 c write area onto terminal screen Write(*, 10) 'radius r =', r, ' A =', A 10 Format(a20, f10.5, a15, f12.7) STOP 'area' END You have created a file consisting of the listing for a program area.f (it's Fortran but that doesn't matter). You can now use this file to try out the Unix tools and editors. It is small, you can always get it back if it gets ruined, and you can even compile and run it.
If you need more than one scratch file you can use the command:
cp area.f area2.f
to create another scratch file (area2.f).
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