Running ./test.sh gives the below output:
test1 is empty
test2 is set (empty string)
test3 is set (has string though)
test4 is not set (does not exist at all)
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August 21, 2017 22:01
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Testing setting environment variables in bash
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| #!/bin/bash | |
| set -eu | |
| TEST1="" | |
| if [[ "${TEST1}" != "" ]]; then | |
| echo 'test1 is NOT empty' | |
| else | |
| echo 'test1 is empty' | |
| fi | |
| TEST2="" | |
| if [[ -z "${TEST2+x}" ]]; then | |
| echo 'test2 is not set' | |
| else | |
| echo 'test2 is set (empty string)' | |
| fi | |
| TEST3="something" | |
| if [[ -z "${TEST3+x}" ]]; then | |
| echo 'test3 is not set' | |
| else | |
| echo 'test3 is set (has string though)' | |
| fi | |
| if [[ -z "${TEST4+x}" ]]; then | |
| echo 'test4 is not set (does not exist at all)' | |
| else | |
| echo 'test4 is set' | |
| fi |
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