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bash:output

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bash:output [2021/01/26 15:16] – peterbash:output [2021/01/26 16:26] (current) – peter
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 [[BASH:Output:Check Exit Status|Check Exit Status]] [[BASH:Output:Check Exit Status|Check Exit Status]]
 +
 +[[BASH:Output:Display output|Display output]]
  
 [[BASH:Output:Get the output of a command|Get the output of a command]] [[BASH:Output:Get the output of a command|Get the output of a command]]
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 [[BASH:Output:Understand the difference between standard output and standard error|Understand the difference between standard output and standard error]] [[BASH:Output:Understand the difference between standard output and standard error|Understand the difference between standard output and standard error]]
  
- +[[BASH:Output:Redirect Output To File, And Still Have It On Screen|Redirect Output To File, And Still Have It On Screen]]
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----- +
- +
- +
-===== Badly-written commands ===== +
- +
-Some commands are not well-written, however, and may write information to the wrong place.  You must keep an eye out for such commands, and work around them when necessary. +
- +
-For example: +
- +
-<code bash> +
-vers=$(python --version) +
-Python 2.7.13 +
-echo "{$vers}" +
-{} +
-</code> +
- +
-Even though we specifically asked for the version number, python wrote it to stderr.  Thus, it appeared on the terminal, and was not captured in the vers variable.  You'd need to use 2>&1 here.+
  
  
bash/output.1611674201.txt.gz · Last modified: 2021/01/26 15:16 by peter
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