I have a shell script with lots of echo
in it. I would like to redirect the output to a logfile.
I know there is the command call cmd > logfile.txt
, or to do it in the file echo 'xy' > logfile.txt
, but is it possible to simply set the filename in the script which then automatically writes all echo's to this file?
You can easily redirect different parts of your shell script to a file (or several files) using sub-shells:
{
command1
command2
command3
command4
} > file1
{
command5
command6
command7
command8
} > file2
#!/bin/sh
# http://www.tldp.org/LDP/abs/html/io-redirection.html
echo "Hello World"
exec > script.log 2>&1
echo "Start logging out from here to a file"
bad command
echo "End logging out from here to a file"
exec > /dev/tty 2>&1 #redirects out to controlling terminal
echo "Logged in the terminal"
Output:
> ./above_script.sh
Hello World
Not logged in the file
> cat script.log
Start logging out from here to a file
./logging_sample.sh: line 6: bad: command not found
End logging out from here to a file
Read more here: http://www.tldp.org/LDP/abs/html/io-redirection.html
LOG_LOCATION="/path/to/logs"
exec >> $LOG_LOCATION/mylogfile.log 2>&1
I tried to manage using the below command. This will write the output in log file as well as print on console.
#!/bin/bash
# Log Location on Server.
LOG_LOCATION=/home/user/scripts/logs
exec > >(tee -i $LOG_LOCATION/MylogFile.log)
exec 2>&1
echo "Log Location should be: [ $LOG_LOCATION ]"
Please note: This is bash code so if you run it using sh it will through syntax error
Source: Stackoverflow.com