logging in Shell script

Shell Programming and Scripting
1

How to I write to a log file all the output that is displaying on the screen? with time stamp.

thankx.

2

if this runs from cron... just add a bit at the end " > logfile.out"

If this runs from a script you kick off add a line at the end of the script or add it at the end when you execute it from the command line...

./script.sh > logfile.out >2 logfile.err

That last bit I added puts all STDERR to a file as well.

3

thanks for you thoughts... but i want to embed the logging inside my script. For every line of output to the screen it will also append to a log file.

can i do something like this

LOG="logfile.txt"
printf "some text to scree" |& tee $LOG;

But the think is i would have to do that for every single line, i was wonderfing if there's a more effiecient way to log the whole execution of my script as opposed to line by line.

thanks.

4

You could have the script recursively run itself to a logfile...

example in csh:

if ( "${argv[1]}" != "~~" ) then

       $\{0\} "~~" $\{argv[2-]\}  >& <logfilename>

       exit

endif