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The example ~/.bash_profile below is compatible with the Bourne shell and gives semantics similar to csh for the ~/.bashrc and ~/.bash_login. The [ -r filename] && cmd is a short-circuit evaluation that tests if filename exists and is readable, skipping the part after the && if it is not.
Having the shell prompt for missing values will allow the author of a script, command or function to mark a parameter as mandatory instead of creating script code to either prompt for the missing values (after determining that it is being run interactively) or fail with a message.
The "rc" suffix on some Unix configuration files (for example, ".vimrc"), is a remnant of the RUNCOM ancestry of Unix shells. [1] [4] The PWB shell or Mashey shell, sh, was an upward-compatible version of the Thompson shell, augmented by John Mashey and others and distributed with the Programmer's Workbench UNIX, circa 1975–1977. It focused ...
For example, (from the Liberty BASIC Help File): "The OPEN command opens communication with a device, which can be a disk file, a window, a dynamic-link library or a serial communications port." OPEN device FOR purpose AS # handle { LEN = n }
“The ability for kids to adapt and have fun … we just mess it up a lot of time.” The words are from Jeff Francoeur, a former standout major league outfielder.
On Unix-like platforms, usage messages usually follow the same common pattern: They often begin with "Usage:" , the command, followed by a list of arguments.; To indicate optional arguments, square brackets are commonly used, and can also be used to group parameters that must be specified together.
For example, married couples filing jointly with taxable income up to $94,050 in 2024 and up to $96,700 in 2025 pay zero taxes on their long-term capital gains. This makes investing potentially ...
No matter how you slice it, the Chicago Cubs were one of the most disappointing teams of 2024. Improved play in the second half enabled a winning record and a second-place finish in the NL Central ...