"bash if command returns non zero"

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1. bash if command returns 0 ••• /mo •••
2. bash if not zero ••• /mo •••
3. bash if function returns 0 ••• /mo •••
4. bash check if variable is zero ••• /mo •••
5. bash if return code not equal 0 ••• /mo •••
6. bash if command returns empty ••• /mo •••
7. bash if command is exit 0 ••• /mo •••
8. command line returned non-zero value:1 ••• /mo •••
9. bash if value is 0 ••• /mo •••
10. bash if $1 not set ••• /mo •••
11. bash if return code ••• /mo •••
12. linux bash if not ••• /mo •••

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