close all unused file descriptors so that child vi goes away if
tree22aaaca3b93953423c71f10c8c4baca56abddabc
-rw-r--r-- 2281 LICENSE
-rw-r--r-- 4897 README
drwxr-xr-x - build.unix
drwxr-xr-x - catalog
drwxr-xr-x - cl
drwxr-xr-x - common
drwxr-xr-x - dist
drwxr-xr-x - docs
drwxr-xr-x - ex
drwxr-xr-x - ip
drwxr-xr-x - ipc
drwxr-xr-x - motif
drwxr-xr-x - motif_l
drwxr-xr-x - perl_api
drwxr-xr-x - perl_scripts
drwxr-xr-x - tcl_api
drwxr-xr-x - tcl_scripts
drwxr-xr-x - vi