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Old 08-04-2003, 01:57 PM   #1
j-me
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Registered: Jan 2003
Location: des moines, ia
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compound grep


I am needing to grep a file to extract the date 'Aug 04'. I am using a script to automate this as I need it to scan the file and email the output.

<script>
works (but not completely). I get all Aug data but I also get anything that has Aug and 04 on the line:

file04 Aug 01 ....

#!/bin/sh
nowmonth=`date +%b`
nowday=`date +%d`
cat /home/input | grep $nowmonth | grep $nowday > mail -s .....



I really want to use:
cat /home/input | grep $nowmonth $nowday > mail -s

I try it but it gives me errors after the $nowmonth.
grep: 04: No such file or directory.

but it just does not seem to work right. Any ideas?

(using RH 8.0)
 
Old 08-04-2003, 02:01 PM   #2
MartBrooks
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Registered: May 2002
Location: London
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Re: compound grep

Quote:
Originally posted by j-me

I really want to use:
cat /home/input | grep $nowmonth $nowday > mail -s

I try it but it gives me errors after the $nowmonth.
grep: 04: No such file or directory.

but it just does not seem to work right. Any ideas?
1) You don't need to use cat as grep will read a file directly
2) Quote the string you want to grep for.

So:

grep "$nowmonth $nowday" /home/input | mail foo@bar.com
 
Old 08-04-2003, 02:07 PM   #3
j-me
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awesome. thanks. guess i had always used cat to grep and didn't think of alternatives.

j-me
 
Old 08-04-2003, 03:04 PM   #4
Bebo
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Registered: Jul 2003
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An alternative to quoting is to make use of the regexps:

Code:
grep $nowmonth\ $nowday /home/input | mail foo@bar.com
Note the use of "\ " which is the regexp of space instead of quotes.
 
  


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