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- Starts automatic logging to a log file named using its 1st logFileTag argument.
- Uses echo -e where the -e argument to echo enables interpretation of backslash escapes.
- e.g. "\n" will be interpreted as a newline, and "\t" as a tab character
- Calls stdStreams with its 2nd and 3rd arguments.
- Calls echo capturing its output in a local variable using backtick execution syntax, then displays the captured text.
- Calls the echo_se function with some text.
- Calls the echo_se function again, capturing its output in a local variable, then displays the captured text.
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# function that illustrates auto-logging and capturing function output
# arg 1 - (required) tag to identify the logfile
# arg 2 - (optional) text for standard output
# arg 3 - (optional) text for standard error
function testAutolog() {
local logFileTag="$1"
local outTxt=${2:-"text for standard output"}
local errTxt=${3:-"text for standard error"}
auto_log "$logFileTag"
echo -e "\n1) Call stdStreams with output and error text:"
stdStreams "$outTxt" "$errTxt"
echo -e "\n2) Capture echo output in a variable and display it:"
local output=`echo $outTxt`
echo -e " echo output was:\n$output"
echo -e "\n3) Call echo_se with error text:"
echo_se "$errTxt"
echo -e "\n4)Capture echo_se function output in a variable and display it:"
output=`echo_se "$errTxt"`
echo -e "echo_se output was: '$output'"
}
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exercise 4
Call the testAutoLog command with no further command line arguments. What happens, and why?
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