bourne shell if [ -e $directory/file.$suffix ]

The Bourne shell is somewhat of an antique. The Solaris version doesn't have the -e operator for the test (a.k.a. [) builtin that was introduced somewhat late in the life of the Bourne shell¹ and enshrined by POSIX.

As a workaround, you can use -f to test for the existence of a regular file, or -r if you aren't interested in unreadable files.

Better, change #!/bin/sh to #!/usr/xpg4/bin/sh or #!/bin/ksh so as to get a POSIX shell.

Beware that [ $option -eq 9 ] is probably not right: -eq is a numerical comparison operator, but $option isn't really numeric — it's a date. On a 32-bit machine, when 201301271355 is interpreted as a number, it is taken modulo 2³². It so happens that no date in the 21st century is very close to 0 modulo 2³², but relying on this is very brittle. Make this [ "$option" = 9 ] instead.

As a general shell programming principle, always put double quotes around variable and command substitutions: "$foo", "$(foo)". If you don't, the shell splits the result at each whitespace character and treats each resulting word as a filename wildcard pattern. So an unprotected $foo is only safe if the value of foo does not contain any whitespace or \[?*. Play it safe and always use double quotes (unless you intend the splitting and pattern matching to happen).

¹ _{Or was it a ksh addition never ported to Bourne? I'm not sure.}