I am trying to create a s开发者_Python百科cript, and one part requires showing lines with numeric values.
My basic syntax is:
echo $i | grep [0-9]
For example, I set i=12345
, it should output 12345
.
But on one server, it doesn't output anything (exactly the same commands).
I do not know how to Google this issue, I have tried "grep output different on other server", to no avail.
When using a regexp, either use egrep
or grep -e
to make sure the pattern is not treated as a plain string.
maybe it's a shell issue? some shells interpert [] differently try
echo "1234" | grep "[0-9]"
(with quotes)
also try
grep --version
to see if there is a different grep version
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