coleman@cam.nist.gov (Sean Sheridan Coleman X5672) (12/10/90)
What is the purpose of the -t option in csh and how does one use it. I tryed to use it doing the following: /bin/csh -t "ps ax; cat ~/.login" It just sat there until I enterd a return the second time. I have SunOS 4.1 Thanks Sean Coleman NIST Boulder, CO coleman@bldrdoc.gov
jik@athena.mit.edu (Jonathan I. Kamens) (12/10/90)
In article <6145@alpha.cam.nist.gov>, coleman@cam.nist.gov (Sean Sheridan Coleman X5672) writes: |> What is the purpose of the -t option in csh and |> how does one use it. I tryed to use it doing the |> following: |> |> /bin/csh -t "ps ax; cat ~/.login" |> |> It just sat there until I enterd a return the second time. My csh(1) (BSD 4.3) says: -t A single line of input is read and executed. A `\' may be used to escape the newline at the end of this line and continue onto another line. Note that the input is read *from the standard input*, not from the command line; you appear to be attempting to use the option as if the input is read from the command line. For that, I believe what you want to use is the -c option, not the -t option. Again, from my man page: -c Commands are read from the (single) following argument which must be present. Any remaining arguments are placed in argv. -- Jonathan Kamens USnail: MIT Project Athena 11 Ashford Terrace jik@Athena.MIT.EDU Allston, MA 02134 Office: 617-253-8085 Home: 617-782-0710
guy@auspex.auspex.com (Guy Harris) (12/15/90)
>What is the purpose of the -t option in csh and >how does one use it. Mr. Kamens' explanation of how to use it, and why you probably don't want to use it, is correct. I assume the purpose for it is the same as the purpose for "-t" flags in other shells, dating back to the V6 shell, which is that it's there for the benefit of "ed"'s "!" command. The V6 "ed" used "read()" to read its command line one character at a time. If it discovered that the character was a "!", as I remember it would then fire off a shell with the "-t" flag, and that shell would then read the rest of the line. I forget whether the original V6 shell (we're talking V6, an OS that came out in 1975, folks...) even had a "-c" flag. I don't think many programs bother using the "-t" flag any more; they tend to use "-c" instead.