I probably would define an alias with my options, e.g.:

alias grep="grep --ignore-case --color"

as this would only affect interactive programs and not scripts. You could then just run\grep or/bin/grep to run it without any options.

If you want to keep usingGREP_OPTIONS you can just unset it for your commandline, e.g.

GREP_OPTIONS= grep ....

• +1 didn't know about the\command-name is used to refer to the original command and not the alias. Really helpful.

  mtk

  – mtk

  2013-03-01 10:27:06 +00:00

  CommentedMar 1, 2013 at 10:27
• possibly relevant:unix.stackexchange.com/q/35789/4098

  rahmu

  – rahmu

  2013-03-01 10:53:26 +00:00

  CommentedMar 1, 2013 at 10:53
• 1
  @mtk seeunix.stackexchange.com/questions/39291/… for other methods

  Ulrich Dangel

  – Ulrich Dangel

  2013-03-01 10:59:04 +00:00

  CommentedMar 1, 2013 at 10:59
• 1
  "command grep" : will launch the grep command (ie, the one found in the $PATH) even if there is an alias or functino with the same name. Usefull to prepend a "command" to actual command's use in alias and function definitions (and elsewhere when you want to bypass any eventual alias or function definition of the same cmd)

  Olivier Dulac

  – Olivier Dulac

  2013-03-01 13:15:06 +00:00

  CommentedMar 1, 2013 at 13:15

• grep
• environment-variables
• case-sensitivity