troubleshooting not working !!

[fasi74]

Hi there i posted that my bsd box return me to login prompt again & again &
give some error about /usr/local/bin/bash not found.
then i got suggestion to move into single usr mode then edit the /etc/passwd
file of boot from cdrom & go into repair mode
so i did that but it is not working  it give me file in readonly mode
..............
Although i have reinstall my BSD & now every thing is fine but dont wana go
through this again ....

what should  have i done ?


Faisal