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"if" statement based off "grep"

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# 1  
Old 06-04-2012
"if" statement based off "grep"
Hello,

I am somewhat new to Linux/Unix. I am currently working on a shell script that is suppose to cat a file, grep the same file for a certain line, if that line is found save the file in a different location, else remove the file.

This is a rough example of what I want.

Code:
$Dating = False

date > DatingTest | grep "May" DatingTest

#Something changing the Dating variable to True based off the grep

if ($Dating = True)
DatingTest > SuccessDate

else

rm DatingTest

any help would be grateful.

Thank you

Moderator's Comments:
Mod Comment Please use code tags, thanks!
Last edited by zaxxon; 06-04-2012 at 10:51 AM.. Reason: code tags
# 2  
Old 06-04-2012
Code:
grep -q May /path/to/somefilename  # silently check for the word May
if [ $? - eq 0 ] ; then                     # it has the word May in the file
   mv /path/to/somefilename   /new/path/to/somefilename
else
   rm /path/to/somefilename            #delete the file
fi

I have a feeling that you should tell us what you want to do not how you decided to do it. For example, how did you come up with the search word: May? Will you need to run the ocde sometime later and have Jun as the search word?
# 3  
Old 06-04-2012
Thank you
Thank you very much for your help.

The code I added was only a simple example of what I wanted. I was just using "May" as an example because it may be an output of "date", but it may not. My real code would not be using the "date" command.

Thank you once more for your help.

---------- Post updated at 04:00 PM ---------- Previous update was at 11:03 AM ----------

So my code should look something like this?

"
Code:
#Creating variable
Dating = False

#Taking output of Date and putting it into DatingTest
date > DatingTest                      

#Using "grep" to search for the word "May" within DatingTest
grep -q "May" DatingTest             

#If "May" was found then move DatingTest over to usb
if [ $Dating - eq 0 ] ; then           
   mv DatingTest /mnt/usb

#Else delete DatingTest file
else
   rm DatingTest

"
Last edited by Scrutinizer; 06-05-2012 at 03:51 AM.. Reason: code tags
# 4  
Old 06-05-2012
Quote:
Originally Posted by Amzerik
if [ $Dating - eq 0 ] ; then
From jim_mcnamara's post, it's [ $? -eq 0 ] not [ $Dating -eq 0 ]

You don't actually need "Dating" variables (pun intended Smilie)
# 5  
Old 06-05-2012
Ok thanks that fix my script.
# 6  
Old 06-05-2012
That's better done as
Code:
if grep -q "May" DatingTest
then
        echo "Matched"
else
        echo "Didn't match"
fi

You seldom need to check the value of $? directly.
# 7  
Old 06-06-2012
Hello again,

I was thinking since we were already talking about "if" how would i go about setting up an if statement with free that would allow me to do an if statement based off how much free memory is remaining.

something like

"
free > Memory.txt

if (FeeMem <= 1000)
then
ps > psinfo.txt
else
rm Memory.txt

exit
"

but i do not want to have to save "free" output into a file just to find the free memory information on it to place it into my "if" statement. Everything must be done without pipes.

any advice would be grateful.

Thank you
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