Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
command if you use
.BR csh (1).
+The initial environment of the shell is populated in various ways,
+such as definitions from
+.IR /etc/environment
+that are processed by
+.BR pam_env (8)
+for all users at login time (on systems that employ
+.BR pam (8)).
+In addition, various shell initialization scripts, such as the system-wide
+.IR /etc/profile
+script and per-user initializations script may include commands
+that add variables to the shell's environment;
+see the manual page of your preferred shell for details.
+
Bourne-style shells support the syntax
NAME=value command