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Issue with Grep

 
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# 1  
Old 11-20-2015
Issue with Grep
Hi guys,

Hope someone can help me with this - I'm sure it's fairly simple but it's driving me mad! (forgive the coding - still new on scripting - come from Windows)

I have the following coding for checking whether I want to include a line in a file:-

Code:
EXTRACT_Date=$(date --date="${PERIOD}" +"%a %b %_d")
more "${CHK_FILE}" | grep -F "${EXTRACT_Date}" > ${SRC_FILE}
echo "grep -F "${EXTRACT_Date}" > ${SRC_FILE}"
echo "${EXTRACT_Date}"

I have set PERIOD to 1 Oct.
Source file data is like this..
Code:
Thu Oct  1 05:50:03 2015 [pid 85454] CONNECT: Client "xxx.xxx.xxx.xxx"

I get the following results from the echo's..

Code:
grep -F Thu Oct 1 > /var/upload/edi/adminedi/Dev_Scripts/ftplog.txt
Thu Oct  1

So I can see that EXTRACT_Date has the correct format and value to match but I get no line extracted. The reason being the missing extra space in the Grep command. So, why does grep remove the extra space in Oct 1?
Last edited by Don Cragun; 11-23-2015 at 01:58 PM.. Reason: Remove COLOR tags; add CODE and ICODE tags.
# 2  
Old 11-20-2015
Please use code tags as required by forum rules!

We can't see multiple spaces in your code/result posts as the code tags are missing. I guess your source file has Oct 1 with one space, while the +"%a %b %_d" will have two. From man date: Try %-d (no padding).
# 3  
Old 11-20-2015
Hi RudiC,

Sorry, I missed the bit about code tags. Smilie


Anyway, the data has 2 spaces "Oct..1" which is why I used the %_d. When I echo the grep command, it shows only once space but the echo for the date value has 2 spaces so I know this is correct. Why does the grep only have one space? This prevents the match but I don't know to force the extra space into the grep.

Thanks
# 4  
Old 11-20-2015
Why don't you place the code tags NOW so we CAN see single/double spaces?

---------- Post updated at 16:01 ---------- Previous update was at 15:59 ----------

Click the "Edit" button to enter the code tags around code & results/data.
# 5  
Old 11-20-2015
Sorry - I thought it was ok on the reply. Here's the code again..
Code:
EXTRACT_Date=$(date --date="${PERIOD}" +"%a %b %_d")
more "${CHK_FILE}" | grep -F "${EXTRACT_Date}" > ${SRC_FILE}
echo "grep -F "${EXTRACT_Date}" > ${SRC_FILE}"
echo "${EXTRACT_Date}"

the data

Code:
Thu Oct  1 05:50:03 2015 [pid 85454] CONNECT: Client "194.115.88.90"

and the result

Code:
grep -F Thu Oct 1 > /var/upload/edi/adminedi/Dev_Scripts/ftplog.txt
Thu Oct  1

Hope I did it correctly this time..
# 6  
Old 11-20-2015
Difficult to understand. If I try that on my linux/bash, with the -x option set, I get:
Code:
EXTRACT_Date=$(LC_ALL=C date --date="${PERIOD}" +"%a %b %_d")
.
.
.
+ EXTRACT_Date='Thu Oct  1'
grep -F "${EXTRACT_Date}" file
+ grep -F 'Thu Oct  1' file
Thu Oct  1 05:50:03 2015 [pid 85454] CONNECT: Client "xxx.xxx.xxx.xxx"

i.e. it works!
Last edited by RudiC; 11-20-2015 at 11:30 AM..
This User Gave Thanks to RudiC For This Post:
NickF
# 7  
Old 11-23-2015
Hi RudiC,

Embarrassingly, the problem turned out to be nothing to do with the code! The issue was that I was using the wrong file! Smilie

Still, confirmation that the Grep was OK helped cause it made me look elsewhere in the coding.

Sorry to have wasted your time on that.

Thanks
 
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