yitz_ 1370582485 learn "When not performing substring expansion, using the forms documented below, bash tests for a parameter that is unset or null. Omitting the colon results in a test only for a parameter that is unset." --''man bash''
yitz_ 1370582497 forget
yitz_ 1370582516 learn "When not performing substring expansion, using the forms documented below, bash tests for a parameter that is unset or null. Omitting the colon results in a test only for a parameter that is unset." --''man bash''
zendeavor 1370582870 forget
zendeavor 1370583049 learn "When not performing substring expansion, parameter expansions including a colon cause bash to test for a parameter that is unset or null. It can be omitted to skip the test for a null parameter."
zendeavor 1370583160 forget
zendeavor 1370583163 learn When not performing substring expansion, parameter expansions including a colon cause bash to test for a parameter that is unset or null. It can be omitted to skip the test for a null parameter, resulting in a test for only an unset parameter.
zendeavor 1370583199 forget
zendeavor 1370583223 learn When not performing substring expansion, parameter expansions including a colon cause bash to test for a parameter that is unset or null. The colon can be omitted to skip the test for a null parameter, resulting in a test for only an unset parameter.
geirha 1607682375 forget
geirha 1607682379 learn When not performing substring expansion, using the forms documented below (e.g., :-), bash tests for a parameter that is unset or null. Omitting the colon results in a test only for a parameter that is unset.
geirha 1607682952 forget
geirha 1607682962 learn When using the default value parameter expansion (${var:-default}), the test checks if var is not set (unset -v var) or empty (var=''). If you omit the colon (${var-default}) it only checks if the var is not set. Same applies for :=, :?, and :+