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shell - Bash regex =~ operator - Stack Overflow What is the operator =~ called? I'm not sure it has a name The bash documentation just calls it the =~ operator Is it only used to compare the right side against the left side? The right side is considered an extended regular expression If the left side matches, the operator returns 0, and 1 otherwise Why are double square brackets required when running a test? Because =~ is an operator of
bash - Shell equality operators (=, ==, -eq) - Stack Overflow If not quoted, it is a pattern match! (From the Bash man page: "Any part of the pattern may be quoted to force it to be matched as a string ") Here in Bash, the two statements yielding "yes" are pattern matching, other three are string equality:
How do AND and OR operators work in Bash? - Stack Overflow Likewise, false true will not evaluate the true operand, because it cannot change the value of the expression Boolean evaluation in bash is actually used mainly for controlling the conditional evaluation of the operands, not their order Typical usage is do_foo || do_bar_if_foo_fails or do_foo do_bar_only_if_foo_has_succeeded
What do the -n and -a options do in a bash if statement? The switches -a and -n are not strictly part of a bash if statement in that the if command does not process these switches What are primaries? I call them "switches", but the bash documentation that you linked to refers to the same thing as "primaries" (probably because this is a common term used when discussing parts of a boolean expression)
shell - Difference between sh and Bash - Stack Overflow When writing shell programs, we often use bin sh and bin bash I usually use bash, but I don't know what's the difference between them What's the main difference between Bash and sh? What do we
How to increment a variable in bash? - Ask Ubuntu #! bin bash # To focus exclusively on the performance of each type of increment # statement, we should exclude bash performing while loops from the # performance measure