${SCRIPTS_DIR}user_info >${log_dir}${BASE_JOB_NAME}.log 2>&1 --- what will this do

UNIX for Advanced & Expert Users
1

Please explain me the following code how it will work

${SCRIPTS_DIR}user_info >${log_dir}${BASE_JOB_NAME}.log 2>&1

2

First of all variables ${SCRIPTS_DIR}, ${log_dir}, ${BASE_JOB_NAME} are expanded.
Then script ${SCRIPTS_DIR}user_info will be executed, it's stdout and stderr will be redirected to ${log_dir}${BASE_JOB_NAME}.log

3

That is ok but what is the meaning of 2>&1

4

redirect stderr (handler=2) to stdout (handler=1)
You can read the command

>logfile 2>&1

as (nothing means stdout by default)

stdout=logfile stderr=stdin

So everything from stdout and stderr will be written to logfile