Unix
The Octal number to be given alogn with chmod command to make a file readable, writable and executable to the owner, readable and executable to group and others is:

755
744
555

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Unix
The % key allows you

to move the cursor backward to the beginning of a word
to move the cursor to the first column in the current line
to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace.
to move the cursor to the upperleft corner of the screen

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