FIX: Bash On Syntax Error

Sometimes your system may throw a bash error if there is a syntax error. There can be several reasons for this problem.

Updated

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    bash if syntax error

    The reason each is a syntax error is because [ is part of the shell syntax; actually order. This element was originally just a symbolic link to the main test command. Of course, this is still the case, but it is also a built-in directive in bash and other Bourne-derived shells.

    if is a wrapper keyword, but it covers if[, not if. Because he didn’t see the exclusive if, he doesn’t know what to do when he sees then. (In fact, it gets exactly what it can: display a syntax error message.)

    A little experiment shows that it’s not as easy as I thought. I tried to provide a command named if[ and put that task in a directory in the private $PATH. If I just type if[ on the command line, the commit asks for more data. I’m not sure what you’re looking for, but it looks like invest handles the mechanism in a special way. The shell simply doesn’t break if[ into the if keyword and only into the [ command (as I’m sure you do)Reasonable expectation based on how different languages ​​work). (If I really wanted to run this command, I could type if[ or "if[" – or sometimes give it some reasonable structure.

    In any case, this part probably doesn’t matter; Adding a space solves the problem.

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    3
    bash if syntax error

    if [ words ];then    # The code in the "expression" instance is true.If

    if [ "$(ipcs|grep test|wc -l)" -eq 630 ]; it follows from that    echo "Shared memory check succeeded"If

    Updated

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  • or [[…]] to prevent word-separation of variable values ​​in the absence of double quotes

    if [[ $(ipcs|grep test|wc -l) -eq 630 ]]; then    echo "view past shared memory"If
    if [[ $(ipcs|grep -c test) -eq 630 ]]; then    echo "Shared memory test passed"If
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