How can I exit a multi-line shell script, on fail, and still log the error stream to a file? [duplicate]

Question

I'm trying to create a shell script (e.g., test.sh) that executes multiple commands, and redirect each command's stdout and stderr to a specific log file.

But, if a command fails, after writing stderr to the log file, I want to abort, rather than continuing with the remaining commands.

Will the following work, or do I need to do something different?

    command1 > log1.txt 2>&1
    command2 > log2.txt 2>&1
    command3 > log3.txt 2>&1

Note that the order of operations for foo >out is that it first opens out, and then runs foo (with its output streaming to the previously-opened file as it's written). Thus, you don't need to worry about an immediate exit preventing the file from being written. — Charles Duffy
– Charles Duffy, Commented Jan 6, 2019 at 3:01

wef · Accepted Answer · 2019-01-06 02:52:22Z

0

Make sure that each command returns an error code (ie non-zero) on failure, then you can use that to bail the containing script eg:

if command1 > log1.txt 2>&1; then
  if command2 > log2.txt 2>&1; then
    command3 > log3.txt 2>&1
  fi
fi

Or, more tersely:

command1 > log1.txt 2>&1 &&
command2 > log2.txt 2>&1 &&
command3 > log3.txt 2>&1

edited Jan 6, 2019 at 2:52

answered Jan 5, 2019 at 8:19

wef

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