User's settings are initially configured with the z/OS shell as the default login shell. To display these settings from TSO type:

LISTUSER USERNAME OMVS

The RACF® settings for that user are displayed:

UID= 0000000012               
 HOME= /shut/home/billyjc
 PROGRAM= /bin/sh              
 CPUTIMEMAX= NONE              
 ASSIZEMAX= NONE               
 FILEPROCMAX= NONE             
 PROCUSERMAX= NONE             
 THREADSMAX= NONE              
 MMAPAREAMAX= NONE             
 READY 

The PROGRAM line refers to the user's login shell. If it is /bin/sh, the login shell is set to the z/OS shell. If it is /bin/tcsh, the login shell is the tcsh shell. To change a user's default login shell from the z/OS shell to the tcsh shell, issue this command:

ALTUSER USERNAME OMVS(PROGRAM('/bin/tcsh'))

To change a user's default login shell from the tcsh shell to the z/OS shell, type:

ALTUSER USERNAME OMVS(PROGRAM('/bin/sh'))