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Sep 14, 2012in bash, there appear to be several variables which hold special, consistently-meaning values. Feb 10, 2010bash always seemed backward with numeric evaluations using an operator consisting of a string (-eq) and string comparisons using a numeric operator "==" or "=" just you mess you up. Jul 25, 2017furthermore, when you use bash -c, behavior is different than if you run an executable shell script, because in the latter case the argument with index 0 is the shell command used to invoke it.

Jan 27, 2017i realize you said “read the bash man pages” but at first, i thought you meant read the man pages within bash. At any rate, man bash returns a huge file, which is 4139 lines (72 pages) long. 13 you can review bash beginners guide for more information.

Feb 24, 201529 bash most certainly is a programming language, one that specialises in the unix/linux shell scripting. It's turing complete so you could (theoretically) write any program in bash. The bash documentation just calls it the =~ operator.

Jan 14, 2010bash is one particular type of linux shell (the bourne again shell), but there are quite a few others. In ubuntu, bash is the default. Sh, bash, zsh, fish, ksh and so on for the content of a script so usually commands with the internal syntax of the shell language.