03-09-2009
How do I grep a Date correctly
I am still a novice at this stuff, but I have searched everywhere and I cant seem to get this working.
I am using a database program that I need to pull information from. The command I am using is the following.
search /project | grep "date -v -1m "+%Y-%m""
This returns no results, however if I break it down it doesnt make sense to me because,
date -v -1m "+%Y-%m""
will return the result of "2009-02"
If I run the command
search /project | grep "2009-02"
I get the results I expect (every file with a creation date or modification date of 2009-02
If I create a variable x=2009-02
then run the command
search /project | grep "$x"
this works and returns all the files created or modified in 2009-02
So why is it that if I set my variable as the date of the previous month using
lastmonth=" date -v -1m "+%Y-%m""
and then run the search with
search /project | grep "$lastmonth"
gives me no results?
Also, FYI, I tried running the whole command together
/search /project | grep " date -v -1m "+%Y-%m""
and still got no results.
Please help. I feel like I've been going in circles on this for 2 days now.
Thanks
-- Jason
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XZGREP(1) XZ Utils XZGREP(1)
NAME
xzgrep - search compressed files for a regular expression
SYNOPSIS
xzgrep [grep_options] [-e] pattern file...
xzegrep ...
xzfgrep ...
lzgrep ...
lzegrep ...
lzfgrep ...
DESCRIPTION
xzgrep invokes grep(1) on files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options
specified are passed directly to grep(1).
If no file is specified, then the standard input is decompressed if necessary and fed to grep(1). When reading from standard input,
gzip(1) and bzip2(1) compressed files are not supported.
If xzgrep is invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1). The same applies to names lzgrep, lze-
grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.
ENVIRONMENT
GREP If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).
SEE ALSO
grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)
Tukaani 2009-07-05 XZGREP(1)