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$ pwd
/home/jmates
$ file .profile
.profile: ASCII text
$ . .profile
ksh: .: .profile: not found
This is ksh working as intended. The "." or dot builtin performs a PATH search and a .profile file has not been found in any PATH directory. Someone thought that a PATH search was the correct thing for the dot builtin to do, so here we are.
$ source
ksh: source: not found
The source builtin comes from a different shell, csh, though has been pilfered into various modern bournelike shells. But maybe not various ksh flavors. Modern is a perhaps dubious term given that some bournelike shells such as ZSH date to 1990. Remember Yugoslavia?
Anyways, the dot builtin needs a fully qualified path to not do a PATH search, similar to using a fully qualified path to a command. A more correct way to load ~/.profile in a ksh would run along the lines of the following.
$ . ~/.profile
Use process tracing. This may also help in the fairly common case of there not being documentation or the documentation sucking. A string that is easy to grep for can help filter out noise.
$ ktrace ksh -c '. easytogrepfor'
ksh: .: easytogrepfor: not found
$ kdump | fgrep easytogrepfor
...
Someone looking at the trace results would need to know enough about unix to recognize that a PATH search was being done. This may help narrow down what to look for in the documentation. Searching only for paragraphs that mention "PATH" yields much less to read:
$ man ksh | col -bx | wc
2999 20481 150488
$ man ksh | col -bx | perl -00 -nle 'print if /PATH/' | wc
172 1488 10499