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Top Forums Shell Programming and Scripting Is anything wrong with this command Post 302287315 by zaxxon on Friday 13th of February 2009 09:16:06 AM
Old 02-13-2009
As vgersh99 said, the grep is not needed; awk can do it. tail -f is ok to watch a log file concurrently:

Code:
echo '[2009-02-13 15:34:53,768] DEBUG - Start! PaymentGatewayFactory - getPaymentGateway (2, 100.00,Mohit Aggarwal,1942, 1,123.50.162.248, , 9821934958)' |\
awk -F, '/DEBUG - Start! PaymentGatewayFactory - getPaymentGateway/ {print $7}'
123.50.162.248

If your awk is annoying you:
If you are on Solaris use /usr/xpg4/bin/awk. Else you might check if you have gawk or nawk.

And no need for less.
 

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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c ncharacters ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or characters, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/sys/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and characters from 0. TAIL(1)
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