What does the following Python program accomplish?

for f in sys$.$argv$[1$:$]$:

try:

with open$($f$,"$r$")$ as infile:

lines $=$ infile.readlines$0$

print$($lines$[$O$].$rstrip$("|n|"))$

print$($lines$[-1].$rstrip$("$

$"))$

except IOError:

sys$.$exit$($l$)$

print alternate lines from the files indicated by command line arguments

encounters errors

print the first and last line from the files indicated by command line arguments

print all lines from the files indicated by command line arguments