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I am writing a csh alias so that I can use the following bash function in my csh :

function up( )
{
    LIMIT=$1
    P=$PWD
    for ((i=1; i <= LIMIT; i++))
    do
        P=$P/..
    done
    cd $P
    export MPWD=$P
}

(I stole the above bash function from here)

I have written this:

alias up 'set LIMIT=$1; set P=$PWD; set counter = LIMIT;  while[counter!=0] set counter = counter-1; P=$P/.. ; end cd $P; setenv MPWD=$P'

However, I am getting the following error:

while[counter!=0]: No match.
P=/net/devstorage/home/rghosh/..: Command not found.
end: Too many arguments.

and my script is not working as intended. I have been reading up on csh from here.

I am not an expert in csh and what I have written above is my first csh script. Please let me know what I am doing wrong.

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1 Answer 1

I’m not sure it’s even possible to do a while loop all on one line.  But there are several fixable errors:

  • while[counter!=0] should be while ($counter != 1) (note the spaces before and after the “!=”).
  • set counter = counter-1 should be @ counter = $counter – 1 (note the spaces before and after the ‘’).
  • P=$P/.. should be set P=$P/.. –– or better yet, set P="$P/.." (in case $P contains space(s).
  • Which reminds me, set P=$PWD should be set P="$PWD", cd $P should be cd "$P", and setenv MPWD=$P should be setenv MPWD="$P", all for the same reason.
  • And, if you do manage to get the while loop all on one line to work, you’re probably going to need a ; after the end.
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I had to write the while loop in a single line because I was getting a horde of errors while using the the next line facility using / –  Wildling Jan 22 '13 at 5:26
    
OK, but my point is: have you ever gotten a ‘while loop in a single line’ to work? If yes, please post an example; even if it’s something trivial like mkdir –p foo/foo/foo; while { cd foo } pwd; end. –  Scott Jan 22 '13 at 16:07

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