Very Computer

I would prefer to use the csh =~ operator instead of a more verbose
switch statement.

        if (`uname -r` =~ "4*") then
        set path = (~/local/sunos.bin $path)
        else
        set path = (~/local/solaris.bin $path)
        endif

Unfortunately the test always fails.  Why doesn't "4*"  match
"4.1.3"?  The csh man page says:

          ==   !=   =~   !~   equal to, not equal  to,  filename-
                              substitution      pattern     match
                              (described    below),     filename-
                              substitution pattern mismatch
     [...]
     The operators: ==, !=, =~, and !~ compare their arguments as
     strings;  other operators use numbers.  The operators =~ and
     !~ each check whether or not a string to the left matches  a
     filename  substitution  pattern  on the right.  This reduces
     the need for switch statements when pattern-matching between
     strings is all that is required.

Thanks,
Jamshid Afshar

: I would prefer to use the csh =~ operator instead of a more verbose
: switch statement.

:       if (`uname -r` =~ "4*") then
:       set path = (~/local/sunos.bin $path)
:       else
:       set path = (~/local/solaris.bin $path)
:       endif

: Unfortunately the test always fails.  Why doesn't "4*"  match
: "4.1.3"?  The csh man page says:

Try taking out the double quotes, like this:

        if (`uname -r` =~ 4*) then

That worked when I tried it.

-- Tom

        if (`uname -r` =~ 4*) then
        echo This is SunOS 4.x.
        endif

I would never have guessed that because using an unqoted asterisk in
other equality tests causes an attempt to match a file in the current
directory:

        if ($FOO == foo*) then  # causes csh error if foo* doesn't match a file
        ...

Jamshid Afshar

 > I'm trying to use the =~ operator in my .cshrc ...

 >   if (`uname -r` =~ "4*") then

 > Unfortunately the test always fails.  Why doesn't "4*"  match
 > "4.1.3"?  The csh man page says:

 >      The operators: ==, !=, =~, and !~ compare their arguments as
 >      strings;  other operators use numbers.  The operators =~ and
 >      !~ each check whether or not a string to the left matches  a
 >      filename  substitution  pattern  on the right.  This reduces
 >      the need for switch statements when pattern-matching between
 >      strings is all that is required.

The man page is perfectly correct. However, filename substitution
patterns cannot be quoted if they are to work as expected. Try:

        if (`uname -r` =~ 4*) then

If you don't see the point, try ls "*" at your csh prompt...

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