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Top Forums Shell Programming and Scripting Script to count matched string then check again from last read position Post 302990170 by andy391791 on Monday 23rd of January 2017 10:21:47 AM
Old 01-23-2017
Not sure exactly what you want to do with the output (maybe send an email ??) but the below script will search for the text and then if found send an email and then continue on from the last line searched.

Code:
#!/bin/ksh

while true
do
line_no=$(wc -l log_file | awk '{line=$1 +1; print line}')
sleep 20
tail +$line_no log_file| grep "Cannot assign requested address" > /tmp/err.txt
    if [ $? -eq 0 ]
then mailx -s "There is an error" emailaddress < /tmp/err.txt
    fi
done

 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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