Hi~ I'm running NetBSD-1.5.2 on the i386 platform w/ wscons enabled (virtual screens 0 thru 3) and am trying to add some C-shell scripting to my ~/.cshrc file that does the following:

1. executes 'tty' and strips the last character off the output and assign it to a variable x (ie. x=3 if tty rtns "/dev/ttyE3")

2. set prompt = "^[[3x;40m$USER@$HOST:"
where x is variable from step 1.
* note: ^[ is the literal ESC character used to set the ansii foreground/background color indicated by [3(fg);4(bg)m

What I've tried -unsuccessfully - is listed below (executed as standalone script for testing purposes):
---
#~/colortest
#!/bin/csh

# script reads tty and sets ascii text color
# "[31;40m = red ; [32;40m = grn ; [33;40m = blue

set scrn = (`/usr/bin/tty | /usr/bin/tail -c 2`)
if ( $scrn == 0 || scrn >= 3 ) then
exit
else
echo ^[[3$scrn;40m
endif

#end of script
---
I'm sure its some silly little thing but being a novice I'm completely stumped.
Beaker

1. In your if-statement, 2nd reference to scrn is missing the dollar-sign.

2. If any of your tty values end in a non-digit, the if-statement, expecting a numeric test, will display "Expression syntax".

3. Your echo includes a semicolon, which is used for command separation. So, echo abc;def would echo abc and then try to locate and run def. But echo abc\;def would echo the 7-character string.

4. If you want a variable concatenated with other letters/digits, then isolate with braces. If I want to echo $myvar followed by x, $myvarx would not get it, so I would have to echo ${myvar}x.

Thanks James for your input: I've got the test script more or less working. One thing I'm stuck on is how to weed out non-integer values passed to $scrn (see below):
---
#!/bin/csh
start:
echo "Enter an integer between 0-3:"
set scrn = $<
if ( $scrn !~ [0-3] ) then
echo "{$scrn} is not a valid entry" ; goto start
else
echo "Good - {$scrn} is valid integer"
endif
---
Entering "a" or something other that a number results in a "if: Expression Syntax" error. Is there some of stipulating something like

IF X EQUALS ANYTHING BUT (0-3) THEN EXIT

where ANYTHING includes strings & mixed numbers?

Thanks Again,
Beaker

I think the check you are doing would be the most appropriate way to check for a single digit 0-3. The =~ and !~ are definitely string operators. Furthermore, I copied and pasted your code verbatum, and it ran with no problems, properly rejecting all entries except a single digit 0-3.

I don't use csh, but that's pretty straight-forward code, and I'm surprised you have a problem with it. Why do you use csh? It is widely recognized as the worst shell by far, fraught with bugs and things it just cannot do.

hi
i want to write ascript in csh , that
kiled all user that idle more than 30 minutes.
please help me!!!!