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Handling all file names safely in Bash

Posted 02-11-2012 at 12:09 PM by Nominal Animal
Updated 04-16-2012 at 02:41 AM by Nominal Animal (Fuller fixes.)
Tags bash, filename, nul

In Linux, each file or directory name (or more generally, pathname component) is just a string of bytes. It always ends with the C end-of-string mark, ASCII NUL: a zero. Value 47, ASCII /, is also reserved for use as a separator between pathnames.

Bash can read ASCII NUL separated data using read -d "" variable. It will, however, remove leading and trailing characters that match IFS, and return false (nonzero status) if the input does not have a final NUL. This applies to...
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Bash scripts and keyboard input

Posted 01-29-2012 at 02:43 PM by Nominal Animal

You can use Bash to read individual keypresses. Here is an example:

# Reset terminal to current state when we exit.
trap "stty $(stty -g)" EXIT

# Disable echo and special characters, set input timeout to 0.2 seconds.
stty -echo -icanon time 2 || exit $?

# String containing all keypresses.

# Set field separator to BEL (should not occur in keypresses)
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