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Searching for variable string

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# 1  
Old 09-08-2015
Searching for variable string
Hi Guys,

So im trying to search for the most recent occurance of a string in the most recently updated .log file in a certain directory. The string i am searching for is a value, now if this value is greater than 800 i would like an email sent out with some text (blah blah blah).

This is what i have so far

Code:
 
ls -Art | tail -n 1| xargs tac | grep -m1  "Total number of clients: "

Running this command will output the following
Code:
19:55:51.815 Total number of clients: 338
xargs: tac: terminated by signal 13

As you can see the total number of clients is smaller than 800, so we dont need an email notification sent out. But in the instance of the value being greater than 800 we will need a notifcation sent.

Your help is appreciated.

Moderator's Comments:
Mod Comment Please use next time code tags for your code or data, thanks
Last edited by vbe; 09-08-2015 at 05:17 AM.. Reason: code tags
# 2  
Old 09-08-2015
Try this using awk:
Code:
fname=$(ls -Art | tail -n 1) 
awk  '/Total number of clients: / && $(NF)>800 {print $0}' $fname > tmp.tmp
[ -s tmp.tmp ] && mailx -s 'blah blah' me@mycompany.com < tmp.tmp

# 3  
Old 09-08-2015
For "the most recent occurance", you might want to adapt jim mcnamara's proposal like
Code:
awk  '/Total number of clients: / && $(NF)>800 {T=$0} END {print T}' $fname > tmp.tmp

# 4  
Old 09-09-2015
Quote:
Originally Posted by jim mcnamara
Try this using awk:
Code:
fname=$(ls -Art | tail -n 1) 
awk  '/Total number of clients: / && $(NF)>800 {print $0}' $fname > tmp.tmp
[ -s tmp.tmp ] && mailx -s 'blah blah' me@mycompany.com < tmp.tmp


I need to make this as a cronjob that runs every 3 minutes however, this seems to send an email out regardless if the value is larger or smaller than 800. I need it ONLY to email if the value is larger than 800, any ideas?


Cheers
Last edited by hello_world; 09-09-2015 at 04:08 AM..
# 5  
Old 09-09-2015
What operating system are you using?

Are you specifying the shell to be used in your script? (If so, how?)

When you are running your script with cron, how are you setting your script's environment variables and the directory in which your script is run?

In what directory are you hoping to find the file(s) you want to process?
# 6  
Old 09-10-2015
Quote:
Originally Posted by Don Cragun
What operating system are you using?

Are you specifying the shell to be used in your script? (If so, how?)

When you are running your script with cron, how are you setting your script's environment variables and the directory in which your script is run?

In what directory are you hoping to find the file(s) you want to process?
* Linux 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

*I created a shell script and gave it execute access E.g. ./connectioncount.sh

*I havent set up the cron yet, once i get the shell script working i will implement as a cronjob

*The directory is in Genesyslogs\confserv

Hope that answers your questions.


Reading in, ive decided to rewrite the script as i prefer to use tac rather than awk as the file is quite large and the job will need to run every 3 minutes. Im half way there, Please see below

Code:
#!/bin/bash
fname=$(ls -Art | tail -n 1)
echo $fname
value=$(tac $fname | grep -m1 "Total number of clients:")
echo $value


All i need now is to capture the last numeric values which appear after Total number of clients: xxxx

If this value is greater than 800 than an email will be sent out.


Thanks.

---------- Post updated at 10:25 PM ---------- Previous update was at 10:24 PM ----------

Almost there, though i cannot seem to get the if statement working, it hangs on that particular command and i dont receive an email. Did i use the correct syntax?

Code:
#!/bin/bash
fname=$(ls -Art | tail -n 1)
echo $fname
value=$(tac $fname | grep -m1 "Total number of clients:")
echo $value
variable=${value##* }
echo $variable
if [ $variable -lt 800 ]; then
	mailx -s "vpsi1ftc has exceeded the connection: $variable" mycompany@company.com.au
fi

Last edited by Don Cragun; 09-10-2015 at 01:25 AM.. Reason: Add CODE and ICODE tags, again.
# 7  
Old 09-10-2015
Quote:
Originally Posted by hello_world

---------- Post updated at 10:25 PM ---------- Previous update was at 10:24 PM ----------

Almost there, though i cannot seem to get the if statement working, it hangs on that particular command and i dont receive an email. Did i use the correct syntax?

Code:
#!/bin/bash
fname=$(ls -Art | tail -n 1)
echo $fname
value=$(tac $fname | grep -m1 "Total number of clients:")
echo $value
variable=${value##*:  } # there's an space before close }
echo $variable
if [ "$variable" -lt 800 ]; then
	mailx -s "vpsi1ftc has exceeded the connection: $variable" mycompany@company.com.au

fi

Take a look at the red highlighted. If your shell supports it you may do
Code:
if [[ variable -lt 800 ]]

or
Code:
if (( variable < 800 ))


However you have been mentioning all along:
Quote:
If this value is greater than 800 than an email will be sent out.
Thus, the proper comparison should be:
Code:
if [ "$variable" -gt 800 ]

Last edited by Aia; 09-10-2015 at 12:53 AM..
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