Redirecting command output as well as commands Post: 302441021

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Top Forums Shell Programming and Scripting Redirecting command output as well as commands Post 302441021 by AncientCoder on Thursday 29th of July 2010 09:56:54 AM

07-29-2010

Registered User

Quote:

awk ... [echo this part to stdout] | tee -a log.txt

I've tried using tee already -

adding 'tee -u -a exec.log' simply sends the output only to exec.log
adding 'tee -u -a exec.log 1>&3' doesn't add anything to exec.log

I need to get the output from 'awk' on the screen AND into exec.log
as well as getting the shell to send it's stderr to exec.log Smilie

Perhaps I should add that I'm testing on SCO Unix Smilie

(with a plan on using on SUSE Linux once it works) so I'm really restricted as to what I can do

---------- Post updated at 08:56 AM ---------- Previous update was at 05:45 AM ----------

I've been thinking and found the answer ... not elegant but it works Smilie

create a macro that read characters and echoes them where I need them ensuring that we can't see the commands execute with the macro (could be a separate shell script I suppose to do same)

Code:

listen() {
    exec 6>&2  
    exec 2>&-
    ok=1
    while [ $ok -eq 1 ]; do
        x=`dd bs=1 count=1`
        case "$x" in
        "") ok=0; continue ;;
        esac
        echo -n $x
        echo -n $x >&3
    done
    echo "" >&3
    exec 2>&6
}

and change the 'awk' command to be

Code:

awk 'BEGIN {for(i=0;i<5;i++) {printf "\rHelloooo" i;system("sleep 1") };print "";exit }' | listen

and presto ... I get the output to original stdout AND into my 'exec.log' as I wanted

if you can improve on this please feel free to post Smilie

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shell(1F)							   FMLI Commands							 shell(1F)

NAME

       shell - run a command using shell

SYNOPSIS

       shell command [command] ...

DESCRIPTION

       The  shell  function  concatenate  its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise
       /usr/bin/sh).

EXAMPLES

       Example 1 A sample output of shell command.

       Since the Form and Menu Language does not directly support background processing, the shell function can be used instead.

	 `shell "build prog > /dev/null &"`

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