This is a simplified version of a script I use:
In its simplified version tt should read the file input line by line and then print it to the standard output and also write to a file log.
input file:
asas
haha
asha
hxa
The script (named simple):
#!/bin/bash
FILE=input
logfile="log"
exec > >(tee "$logfile") # redirect the output to a file but keep it on stdout
exec 2>&1
DONE=false
until $DONE; do
read || DONE=true
[[ ! $REPLY ]] && continue #checks if a line is empty
echo "----------------------"
echo $REPLY
done < "$FILE"
echo "----------------------"
echo ">>> Finished"
The output (on console):
-bash-3.2$ ./simple
-bash-3.2$ ----------------------
asas
----------------------
haha
----------------------
asha
----------------------
hxa
----------------------
>>> Finished
At this time I need to press enter to terminate the script. Notice that a command prompt -bash-3.2$ showed up during execution.
I checked that those lines are to blame:
exec > >(tee "$logfile") # redirect the output to a file but keep it on stdout
exec 2>&1
Without them the output is as expected:
-bash-3.2$ ./simple
----------------------
asas
----------------------
haha
----------------------
asha
----------------------
hxa
----------------------
>>> Finished
-bash-3.2$
What is more I don't need to press enter to terminate the script. Unfortunately I need saving the output both to the console (stdout) and a log file.
How can this be fixed?
You can use tee on the echo lines directly.
For example:
[ben@lappy ~]$ echo "echo and save to log" | tee -a example.log
echo and save to log
[ben@lappy ~]$ cat example.log
echo and save to log
The -a argument to tee will append to the log.