Bad : modifier in $ (.)

Question

I want to set environment variable in linux and did the same by giving command

 export PATH=$PATH:.

But getting error Bad : modifier in $ (.).<

Answer 1

Bad : modifier in $ (.).

This is not a Bash error, nor is it from Ksh: it's from C-shell or one of its clones such as Tcsh.

You want:

setenv PATH ${PATH}:.

But you should not put . in your ${PATH}, it's a well-known security risk.