Bash is the GNU Project's shell. Bash is the Bourne Again SHell. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional improvements over sh for both programming and interactive use. In addition, most sh scripts can be run by Bash without modification.
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The SafeYAML gem provides an alternative implementation of YAML.load suitable for accepting user input in Ruby applications. Unlike Ruby's built-in implementation of YAML.load, SafeYAML's version will not expose apps to arbitrary code execution exploits.