Craig White wrote:
I'm in my bash book and looking on web but can't seem to resolve this
simple problem.
$ if [ -n "grep A121 myfile.csv" ]; then echo "null"; fi
null
$ if [ -n "grep A125 myfile.csv" ]; then echo "null"; fi
null
A125 definitely is null when I just run the grep command in the quotes
but A121 definitely is not null.
What am I missing on the if/null operator here?
As written, you are asking if the literal string "grep A121 myfile.csv"
is non-null, which obviously is true and has nothing whatsoever to do
with the 'grep' command, which is never invoked.
$ if [ -n "`grep A121 myfile.csv`" ]; then echo "null"; fi
This will actually invoke 'grep' and insert its output into the string
to be tested.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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