diff options
| -rw-r--r-- | lisp/env.el | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/lisp/env.el b/lisp/env.el index 3445d1c060e..145c164ddde 100644 --- a/lisp/env.el +++ b/lisp/env.el @@ -1,4 +1,4 @@ -;;; setenv.el --- functions to manipulate environment variables. +;;; env.el --- functions to manipulate environment variables. ;;; Copyright Free Software Foundation 1991 @@ -31,24 +31,30 @@ ;;; Code: ;;;###autoload -(defun setenv (variable value) +(defun putenv (variable &optional value) "Set the value of the environment variable named VARIABLE to VALUE. -VARIABLE and VALUE should both be strings. +VARIABLE should be a string. VALUE is optional; if not provided or is +`nil', the environment variable VARIABLE will be removed. This function works by modifying `process-environment'." (interactive "sSet environment variable: \nsSet %s to value: ") (if (string-match "=" variable) - (error "Environment variable name contains `='") + (error "Environment variable name `%s' contains `='" variable) (let ((pattern (concat "\\`" (regexp-quote (concat variable "=")))) (scan process-environment)) (while scan (cond ((string-match pattern (car scan)) - (setcar scan (concat variable "=" value)) + (if (eq nil value) + (setq process-environment (delq (car scan) process-environment)) + (setcar scan (concat variable "=" value))) (setq scan nil)) ((null (setq scan (cdr scan))) (setq process-environment (cons (concat variable "=" value) process-environment)))))))) -(provide 'setenv) +;; Provide backward-contemptibility. +(fset 'setenv 'putenv) -;;; setenv.el ends here +(provide 'env) + +;;; env.el ends here |