linux - How to do it correctly: grep -ri '->' - 


cat a.txt | grep -ri '->'

i want grep lines text arrow ->. in linux shell - means starts of option
, > means pipe output file.

so after doing command given above ,i got error 

[root@rs169 document_root]# cat a.txt | grep -ri '->' grep: invalid option -- '>' usage: grep [option]... pattern [file]... try `grep --help' more information.

can tell how correctly?

another way of doing use -- - tells grep have finished using flags, , - appearing after interpreted literally.

$ echo "->" | grep -- "->" ->

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