Commands within if condition

Question

I am new to scripting

Can anyone help me with what is wrong with my below script. I am getting an error.

if `tail -2 jeevagan/sample/logs.txt | head -1 | grep "Start Outputing Report"` = TRUE && `tail -1 jeevagan/sample/logs.txt | grep "Start Outputing Report"` = TRUE

then
        echo "report error"
else
        echo "report good"
fi

In the logs file, i have logs such as below:

2016-04-07 06:57:36,248 INFO : Finished Outputing Report:, Format:EXCEL, Locale: en_IN
2016-04-07 07:06:52,812 INFO : Start Outputing Report:, Format:EXCEL, Locale: en_IN
2016-04-07 06:52:56,451 INFO : Finished Outputing Report:, Format:EXCEL, Locale: en_IN
2016-04-07 06:52:56,451 INFO : Finished Outputing Report:, Format:EXCEL, Locale: en_IN
2016-04-07 07:06:52,812 INFO : Start Outputing Report:, Format:EXCEL, Locale: en_IN
2016-04-07 07:06:52,812 INFO : Start Outputing Report:, Format:EXCEL, Locale: en_IN
2016-04-07 07:06:52,812 INFO : Start Outputing Report:, Format:EXCEL, Locale: en_IN

score 1 · Accepted Answer · answered Apr 08 '16 at 13:53

From 'man bash' on my solaris system:

command1 && command2
command2 is executed if, and only if,  command1  returns  an
exit status of zero.

To examine the exit status run a command, then

echo $?

So

tail -2 log.txt | head -1 | grep "Start Outputing Report"

Returns 0

So you can string them together like so

tail -2 log.txt | head -1 | grep "Start Output" && tail -1 log.txt | grep "Start Output" && echo "report error"

or script them out something like

tail -2 log.txt | head -1 | grep "Start Output" && tail -1 log.txt | grep "Start Output" 

return=$?

if [[ $return == 0 ]]; then
    echo "report error"
else
    echo "report good"
fi

Commands within if condition

1 Answers1