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Home > Forums > Programmers > Languages > UNIX Scripting Forum

Shell script output to console and logfileHelpful Member!(2) 

thread822-1674822
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AlStl (MIS)
13 Feb 12 13:21
Guys,

I have successfully coded the shell script output to a logfile:

LOG_DIR = /xxx/yyy

exec 1>$LOG_DIR/script_name/$(date +%Y%m%d%H%M).log

This script performs several functions. Mainly inserting data into several Oracle tables. This takes time. I want to see these two things happen. A or B or BOTH

a) Beside stdout to LOG_DIR i also want to see the output on the screen. Reason: At least i will  know when this thing ended.

b) Script tells me when it ended something echo on the screen.

Can someone help?

Al
Helpful Member!  Annihilannic (MIS)
13 Feb 12 18:04
For option (b) you could just echo something to standard error (since you are only logging standard output) when the script is done, e.g.:

CODE

print -u2 "job done"      # ksh only

echo "job done" >&2

To use tee as PHV suggested you would need to either redirect the output of your entire script into a tee command rather than using the exec format, or do something like this:

CODE

LOG_DIR = /xxx/yyy

# create a pipe file
mknod /tmp/pipefile.$$ p

# start tee process in background to read it and output contents
# to screen and log file
tee $LOG_DIR/script_name/$(date +%Y%m%d%H%M).log </tmp/pipefile.$$ &

# redirect stdout to the pipe file for remainder of script
exec >/tmp/pipefile.$$

#
# main script here
#

# clean up pipe file
rm -f /tmp/pipefile.$$

Another perhaps neater way is with Ksh Co-processes, and your exact requirements are describe in exercise 9 here:

http://www.dartmouth.edu/~rc/classes/ksh/coprocesses.html

Bash 4.0 also supports them, but I haven't tried it, and it doesn't look as tidy:

http://www.linuxjournal.com/content/bash-co-processes

Annihilannic
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Helpful Member!  PHV (MIS)
13 Feb 12 18:11
A very simple way:

CODE

LOG_DIR = /xxx/yyy
log=$LOG_DIR/script_name/$(date +%Y%m%d%H%M).log
(
echo "Start job: $(date)"
your script here
echo "End job: $(date)"
) | tee $log

Hope This Helps, PH.
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AlStl (MIS)
14 Feb 12 15:23
Guys,

Thanks a lot of your input. I am going to mull over this and decide the best way forward.

Al
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