# Foundations of higher mathematics by Peter Fletcher

By Peter Fletcher

The authors think that scholars utilizing this article have already taken classes during which they built the ability of utilizing effects and arguments that others have conceived. this article choices up the place the others left off -- it develops the scholars skill to imagine mathematically and to differentiate mathematical considering from wishful pondering.

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Variables can also contain digits, but a name starting with a digit is not allowed: prompt> export 1number=1 bash: export: `1number=1': not a valid identifier To set a variable in the shell, use VARNAME="value" Putting spaces around the equal sign will cause errors. It is a good habit to quote content strings when assigning values to variables: this will reduce the chance that you make errors. Some examples using upper and lower cases, numbers and spaces: franky ~> MYVAR1="2" franky ~> echo \$MYVAR1 2 franky ~> first_name="Franky" franky ~> echo \$first_name Franky franky ~> full_name="Franky M.

Writing and debugging scripts 24 Bash Guide for Beginners Comments also make your own life easier. Say that you had to read a lot of man pages in order to achieve a particular result with some command that you used in your script. You won't remember how it worked if you need to change your script after a few weeks or months, unless you have commented what you did, how you did it and/or why you did it. sh, which we edit so that the comments reflect what the script does. /bin/bash # This script clears the terminal, displays a greeting and gives information # about currently connected users.

An array variable from which Bash reads the possible completions generated by a shell function invoked by the programmable completion facility. An array variable containing the current contents of the directory stack. The numeric effective user ID of the current user. The editor used as a default by the -e option to the fc built-in command. A colon-separated list of suffixes to ignore when performing file name completion. The name of any currently-executing shell function. A colon-separated list of patterns defining the set of file names to be ignored by file name expansion.