Eval under the shell in POSIX

In a POSIX shell environment, eval is used to remove a string when the parameter option is used, and the effect is the same as "'", which is useful when writing large numbers of references to more complex scripts. The simple use of bash, usually used by the instructions are divided into tokens to deal with, if it is through the pipeline (|) or a large number of references, often because of redundant instructions cause parameter expansion error, then you need to use to eval, here is a simple example:

#!/bin/bashargs= "Ls-al" echo "args is: $args" eval $args

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Eval under the shell in POSIX