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‘<‘ – controls input to program – stdin b. -eq – equal to 2.
-le – less than or equal to 6. ‘uid’ tasks: 1. dump all variables a. typeset – dumps all variables, including type b. typeset -x – dumps all exported shell variables c. typeset -i – dumps all integer variables note: if ‘typeset’ is not used within a function to localize variables, the variable(s) that are set in the function, when called, will overrite its global counterpart 4. truncate text a. typeset -l4 – extracts the first 4 chars from the left of the variable b. typeset -r4 – extracts the first 4 chars from the right of the variable tasks: 1. check that only 1 positional parameter exists a. use test to ensure at least 1 positional parameter b. use compound test to ensure only 1 positional parameter
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input / output. input and output of a command can be redirected:
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