Shulou(Shulou.com)06/02 Report--

[hhu@hhu ch2] $vim echo.sh #! / bin/bash cd / tmp echo "hello world!"

Without adding executable permission to the file, the sh command can still be executed, but you cannot use. / to execute [hhu@hhu ch2] $ll total 4-rw-rw-r-- 1 hhu hhu 42 Mar 2 15:22 echo.sh [hhu@hhu ch2] $sh echo.sh hello world! [hhu@hhu ch2] $. / echo.sh-bash:. / echo.sh: Permission denied [hhu@hhu ch2] $chmod + x echo.sh [hhu@hhu ch2] $. / echo.sh hello world!

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