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This is bash, but the select builtin exist in ksh as well:select FCT in server user application quit
do case $FCT in
ser*) select SRV in $(cut -d, -f1 file4 | sort -u)
...

Why not run grep on the server instead of cat? Less traffic.

Also, a while loop is more appropriate.

Use printf to print a string without adding a newline at the end.

ssh -n is used to...