linux - SETENV: Bad : modifier in $ ($) -

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i using tcsh terminal in linux. in other terminal used set path license file follows:

  export path="$path:$model_tech"

tcsh shell not recognise command tried following:

  setenv path "$path:$model_tech"   set path "$path:$model_tech"   setenv path=("$path:$model_tech")

but following error:

bad : modifier in $ ($).

what great if me here out quickly, tried quite few combinations nothing works.

drop =

setenv license_file "/usr/local/softwarex/license.dat"

from man page tcsh:

   setenv [name [value]]     without  arguments, prints names , values of environ‐    ment variables.  given name, sets environment variable name    value or, without value, null string.

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