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Linux Shell scripting with Bash : Includes index by Ken O Burtch

By Ken O Burtch

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Extra resources for Linux Shell scripting with Bash : Includes index

Example text

Shopt -o emacs is on if you are in emacs mode. shopt -o vi is on if you are in vi mode. Only one mode can be on at a time. $ shopt -o emacs emacs on $ shopt -o vi vi off Regardless of the mode, the arrow keys move the cursor and step through the most recently executed command: Left arrow—Moves back one character to the left. No characters are erased. Right arrow—Moves forward one character to the right. Up arrow—Moves to the previous command in the command history. Down arrow—Moves to the next command in the command history (if any).

DATE bash: DATE: command not found Arguments are additional information supplied to a command to change its behavior. The date command takes a format argument to change the appearance of the date and time. To see the date in Coordinated Universal Time (UTC, formerly called GMT), use the -u switch. $ date -u Wed Apr 4 14:46:41 UTC 2001 Because the terms “options” and “flags” are used in so many contexts, they are referred to as switches in this book. Switches and arguments are collectively called parameters.

For example, shift-insert, often used to paste text, might be handled by your X Window server before your Linux computer or your shell have a chance to see it. Variable Assignments and Displaying Messages Variables can be created and assigned text using an equals sign. Surround the text with double quotes. txt” The value of variables can be printed using the printf command. printf has two arguments: a formatting code, and the variable to display. txt printf can also display simple messages. Put the message in the place of the format- ting code.

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