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I have set GREP_OPTIONS="--ignore-case --color" in ~/.bashrc as I normally want grep to work case-insensitive. However, there are times when I need grep to actually search case-sensitive, but the man page doesn´t suggest a param for this.

How can I achieve this?

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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 using GREP_OPTIONS you can just unset it for your commandline, e.g. 

GREP_OPTIONS= grep ....
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  • +1 didn't know about the \command-name is used to refer to the original command and not the alias. Really helpful.
    – mtk
    Commented Mar 1, 2013 at 10:27
  • possibly relevant: unix.stackexchange.com/q/35789/4098
    – rahmu
    Commented Mar 1, 2013 at 10:53
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    @mtk see unix.stackexchange.com/questions/39291/… for other methods
    – Ulrich Dangel
    Commented Mar 1, 2013 at 10:59
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    "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
    Commented Mar 1, 2013 at 13:15

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