Page Comparison

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Standard streams

As described Intro Unix: Standard streams and redirection each with a well-defined stream number:

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~/workshop/step_01.sh helloWorld My name is Anna | tee step_01.log

See Standard streams and piping in the Intro Unix wiki.

When standard output and standard error streams are used

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• Starts automatic logging to a log file named using its 1st logFileTag argument, by calling the auto_log function.
• Uses echo -e where the -e argument to echo enables interpretation of backslash escapes.
  • e.g. "\t" as a tab Tab character and "\n" will be interpreted as a newline.
• 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.
  • see Quoting in the shell Intro Unix:Backtick evaluation quoting
• 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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1) Call stdStreams with output and error text:
to standard output: 'text for standard output'
to standard error:  'text for standard error'

2) Capture echo output in a variable and display it:
   echo output was:
text for standard output

3) Call echo_se with error text:
text for standard error

4)Capture echo_se function output in a variable and display it:
text for standard error
echo_se output was: ''

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