By Arnold Robbins
It s easy: a good way to have interaction deeply with Mac OS X, Linux, and different Unix-like platforms, you must understand how to paintings with the Bash shell. This concise little ebook places the entire crucial information regarding Bash correct at your fingertips.
You ll fast locate solutions to the aggravating questions that in general arise in case you re writing shell scripts: What characters do you want to cite? How do you get variable substitution to do just what you will want? How do you utilize arrays?
Updated for Bash model 4.4, this publication has the solutions to those and different difficulties in a layout that makes shopping quickly and easy.
• Invoking the shell
• capabilities and variables
• mathematics expressions
• Command history
• Programmable completion
• task control
• Shell options
• Command execution
• constrained shells
• integrated commands"
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Additional resources for Bash Pocket Reference: Help for Power Users and Sys Admins (2nd Edition)
There are seven kinds of expansion performed: brace expansion, tilde expansion, parameter and variable expansion, command substitution, arithmetic expansion, word splitting, and pathname expansion. The order of expansions is as follows: brace expansion, tilde expansion, parameter, variable, command, and arithmetic substitution (done in a left–to–right fashion), word splitting, and pathname expansion. On systems that can support it, there is an additional expansion available: process substitution.
Positional parameters are assigned from the shell’s arguments when it is invoked, and may be reassigned using the set built-in command. Positional parameters may not be assigned to with assignment statements. The positional parameters are temporarily replaced when a shell function is executed. ) When a positional parameter consisting of more than a single digit is expanded, it must be enclosed in braces. ) SPECIAL PARAMETERS The shell treats several parameters specially. These parameters may only be referenced; assignment to them is not allowed.
Quick append; add files to the end of archive without checking for replacement. The modifiers a, b, and i do not affect this operation; new members are always placed at the end of the archive. The modifier v makes ar list each file as it is appended. Since the point of this operation is speed, the archive’s symbol table index is not updated, even if it already existed; you can use ar s or ranlib explicitly to update the symbol table index. Insert files into archive (with replacement). This operation differs from q in that any previously existing members are deleted if their names match those being added.
Bash Pocket Reference: Help for Power Users and Sys Admins (2nd Edition) by Arnold Robbins