cleopatra% make screen
## working directory is /mit/docsourc/doc/unix/ps1/15.yacc #####################
nroff ss.. ss0 ss1 ss2 ss3 ss4 ss5 ss6 ss7 ss8 ss9 ssA ssB ssa ssb ssc ssd -ms >
 yacc.text
Cannot open -ms
*** Exit 2

Stop.
cleopatra% 






old error:

## working directory is /mit/athenadoc/doc/unix/ps1/15.yacc ####################
refer -e -p /usr/doc/run/Ind ss.. ss0 ss1 ss2 ss3 ss4 ss5 ss6 ss7 ss8 ss9 ssA ss
B ssa ssb ssc ssd | nroff -ms > yacc.text
sh: REFS.ig: cannot create
Error: Can't read fgrep index REFS.ig
*** Exit 1