I added my program RPM file to RedHat/RPMS directory and modified comps.xml file. When I install this custom install CD, there are some errors. Error messages in the /mnt/sysimage/root/install.log file are as follows; ..... Installing myprogram-0.1-1. /var/tmp/rpm-tmp.24351: line 1: chmod: command not found /var/tmp/rpm-tmp.24351: line 2: ln: command not found /var/tmp/rpm-tmp.24351: line 3: chown: command not found /var/tmp/rpm-tmp.24351: line 4: chmod: command not found I found these commands(chmod, ln, chown etc.) in /usr/bin directory. but install scripts can't find it. The %post script of myprogram.spec fils are as follows: %post chmod 755 /etc/rc.d/init.d/myprogram ln -s /usr/local/myprogram/bin/myprogram /usr/sbin/myprogram chown ... chmod ... But another RPMS are installed successfully. I think I can't use absolute path(/usr/bin/ln etc.) because the path of common linux is "/bin". what is the problem? Lee.