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NOP (code)
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=== Shell scripting (bash, zsh, etc.) === The '<code>:</code>' [colon] command is a shell builtin that has similar effect to a "NOP" (a do-nothing operation). It is not technically an NOP, as it changes the special parameter $? (exit status of last command) to 0. It may be considered a synonym for the shell builtin 'true', and its exit status is true (0).<ref>[http://tldp.org/LDP/abs/html/special-chars.html Advanced Bash-Scripting Guide > Chapter 3. Special Characters]</ref><ref>bash manpage > SHELL BUILTIN COMMANDS</ref><ref>zsh manpage (zshbuiltins) > SHELL BUILTIN COMMANDS</ref>
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