Functions csh

[Anthony Perot]

Hi,

How to use functions in csh scripts ?


test1 ()
{
echo "Hi"
}

=> Badly placed ()'s

Anthony PEROT

[j...@invalid.address]

Anthony Perot <anthon...@alcatel.fr> writes:

> How to use functions in csh scripts ?

Add the line

#!/usr/bin/ksh

to the top of the script, and adjust syntax accordingly.

Otherwise, put each "function" in a separate script and call that,
putting up with the overhead of starting a new process everytime you
call a subroutine. The first option is better though.

[Ben Altman]

"Anthony Perot" <anthon...@alcatel.fr> wrote in message
news:3CC6BC97...@alcatel.fr...

> Hi,
>
> How to use functions in csh scripts ?

From a while ago, a post from Brian Hiles:

----- Original Message -----
From: "Brian Hiles" <b...@rawbw.com>
Newsgroups: comp.unix.shell
Sent: Tuesday, August 07, 2001 6:48 PM
Subject: Re: csh function syntax?

kim <kim.w...@compaq.com> wrote:
> nos...@please.thankyou wrote:
> > functions in csh...
> I can't really say why, but yes I think it is by some uninformed
> people. I've studiously avoided learning anything about csh, only to
> have to learn it after all.

Well, just so we know that you understand that you know that we
understand....

If you _really_ have to use csh here is a kludge to simulate functions
in csh.... I did not come up with this and merely forward this information.

From: kla...@informatik.rwth-aachen.de (Klaus Frank)
Newsgroups: comp.unix.shell
Subject: Re: function in c-shell
Date: 17 Jan 2001 18:45:09 GMT

In comp.unix.shell you write:
>Can I write a function in .cshrc that can accept an argument? I yes,
>can someone give an example. I would like to be able to call the
>function in the command line at anytime I like.

Yes. It can be done with a little helper function... see usage example at
end.
!!:1 means first argument, !!:15 the fifteenth argument, !!:* all arguments.

-- Klaus Frank <kla...@Pool.Informatik.RWTH-Aachen.DE>

alias make_alias '\\
<<"end_alias" sed -e '"'"'\\
#\\!/bin/sed -f\\
#\\
## Make the eval command\\
# quote quotes\\
s/'"'"'"'"'"'"'"'"'/'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'/g;
\\
# enclose with quotes\\
1s/^/eval '"'"'"'"'"'"'"'"'/;\\
$s/$/'"'"'"'"'"'"'"'"'/;\\
#\\
## Make the alias command\\
# escape exclamation marks and newlines\\
s/\\!/\\\\!/g;\\
s/$/\\\\/g\\
# quote quotes\\
s/'"'"'"'"'"'"'"'"'/'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'"'/g;
\\
# enclose with quotes\\
1s/^/alias @alias_name@ '"'"'"'"'"'"'"'"'/;\\
$a\\\
;echo >/dev/null'"'"'"'"'"'"'"'"'\\
#^^^^^^^^^^^^^^^ (workaround against printing of arguments)\\
'"'"' | \\
sed -e s/@alias_name@/\!\!:1/ >/tmp/make_alias$$; \\
source /tmp/make_alias$$; \\
rm /tmp/make_alias$$; \\
'

make_alias example
echo -n 'starting command "!!:1" .....'
if ( { !!:1 } ) then
echo ok
else
echo fail
endif
"end_alias"

example true
example false

=Brian

[David Thompson]

"Anthony Perot" <anthon...@alcatel.fr> wrote

> How to use functions in csh scripts ?
>
>
> test1 ()
> {
> echo "Hi"
> }
>
> => Badly placed ()'s

Why are you programming in csh? Can you switch to another shell?

Read these,

http://www.grymoire.com/Unix/Csh.html
http://www.grymoire.com/Unix/CshTop10.txt
http://www.perl.com/pub/a/language/versus/csh.html

--
David Thompson
dat...@yahoo.com

[Bruce Barnett]

Besides Brian's suggestion (which I think was inspired by aliases from
Dan Bernstein) the only other way to do it is to use separate
files/scripts for each function. But if you do that, you can also use
/bin/sh

--
Sending unsolicited commercial e-mail to this account incurs a fee of
$500 per message, and acknowledges the legality of this contract.

[swa...@gmail.com]

#!/bin/tcsh -f

set RETURN = HERE_1
set input = "HELLO WORLD"
goto FUNCTION
HERE_1:
echo "input=$input, output=$output"

echo ""

set RETURN = HERE_2
set input = "GOOD DAY"
goto FUNCTION
HERE_2:
echo "input=$input, output=$output"



#-------------------------------------------------------------------------------

exit
FUNCTION:
set output = (`echo $input | awk '{print $2,$1}'`)
goto $RETURN
exit

#-------------------------------------------------------------------------------

# This will produce the following:

input=HELLO WORLD, output=WORLD HELLO

input=GOOD DAY, output=DAY GOOD