05-26-2017
tcsh hmmm stands for "turbo" C-SHELL ? ...
Was used a lot in the early years of SunOS, at the time FORTRAN, assembler and C was used intensively... as was mostly used by C language programmers as offered more than the basic Bourne shell only times have changed Korn has evolved a lot and with GNU stuff and linux arriving and widespread so did the usage of bash...
Why would one use tcsh currently unless he is a C aficionado?
All I can suggest then is to look back in older literature like manuals of SunOS4 or anything early 90' where it was commonly used - I remember of a good documentation maybe around 93 I used then with linux v.a99p118 ... Dont remember if it were part of that slackware release.
Good luck, what is wrong with bash or ksh? Is it you are using an old BSD?
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RBASH(1) General Commands Manual RBASH(1)
NAME
rbash - restricted bash, see bash(1)
RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO
bash(1)
GNU Bash-4.0 2004 Apr 20 RBASH(1)