Maximum length of command line argument that can be passed to SQL*Plus?

Try with: xargs --show-limits </dev/null

Your environment variables take up 2446 bytes
POSIX upper limit on argument length (this system): 2092658
POSIX smallest allowable upper limit on argument length (all systems): 4096
Maximum length of command we could actually use: 2090212
Size of command buffer we are actually using: 131072

There is no limit per argument, but a total for the whole command line length. In my system (Fedora 15/zsh) its closer to 2Mb. (line 4).

I came across "How long an argument list your kernel can take on the command line before it chokes?":

getconf ARG_MAX

which gives the following on my system:

131072