On 04/18/2011 06:11 AM, Daniel Schade wrote: > Dear gnu.org Team, > > I have useed grep to search for double minus in a string and grep told me an > error, take a look to the samples > > [root@myhost]# echo "Test --" | grep -i '--'
This is not a bug in grep, but a misunderstanding on your part at how to delimit the end of options. Try: echo "Test --" | grep -i -- -- instead. The first -- tells grep that all remaining arguments are not options, but literal operands, so that the second -- can be used as the search pattern. This behavior is required by POSIX for most utilities (there are a few exceptions, such as echo, but in general -- processing is a useful idiom to know). > [root@myhost]# grep --version > grep (GNU grep) 2.5.1 You may want to consider upgrading - the latest stable version is 2.7, and fixes several bugs present in 2.5.1. -- Eric Blake [email protected] +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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