GNU bash

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Safe bash

Command Comments
set -o pipefail returns error if the pipe fails
set -e exit on the first program fail

test or [ [1][2]

Command Comments
-d file file is a directory
-n string the length of string is nonzero
string1 != string2 string1 and string2 are not equal

References

  1. ↑ http://tldp.org/LDP/abs/html/fto.html
  2. ↑ http://tldp.org/LDP/abs/html/comparison-ops.html
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