Answer / shailendra kumar tiwary

we can set PATH by using export PATH command.
ex:-
PATH=/opt/j2sdk1.4.2_04/bin:............
export PATH

and to make it executable we can set the same
in ".bash_profile".

To execute it ". .bash_profile"

Answer / swaroopa

use setenv command to set the path

eg: setenv PATH "/workingdir/"

Answer / kaustubh

In shell we can set any env variables in .bashrc file,
.bash_profile file in the user directory or fin /etc/bashrc

by setting variable name PATH(here)
and then export
example

PATH=$home/bin/
export PATH

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