CSH集团存在测试与价值测试

Question

在CSH中，是否可以将变量实例的测试嵌套在同一if子句中，并测试其值？

#!/bin/csh

# This seems to work...
if ( $?VAR ) then
    echo "VAR exists"        
    if ( $VAR == true ) then
        echo "VAR is true"
    endif
endif

# I want something more like this:
if (( $?VAR ) && ( $VAR == true )) then
    echo "VAR exists and is true"
endif

Answer 1

短路评估是many things that C shell doesn't do之一。您必须使用嵌套的if语句或切换shell。