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Thanks for reply, but the -p option is only supported on SOLARIS 9 and not supported by most platform, like AIX, HPUX, even SOLARIS 8.

I ask this question since sometimes i run a time-consuming ftp in foreground and forget to use nohup ftp.sh & to put this work background and can still running after i log off.
Assume this ftp task...

please try the script below
if the input file is file1 through file3
multijoin.sh
#!/usr/bin/ksh
c=1
for f in file?
do
if [[ c -eq 1 ]];
then
cat $f > tmp
...

besides -qi option, the -w option is prefered if you want a exact word match