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Old

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...
Senior Member
Posted in Uncategorized
Views 1692 Comments 0 Nominal Animal is offline
Old

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:
Code:
#!/bin/bash

# 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.
KEYS=""

# Set field separator to BEL (should not occur in keypresses)
IFS=$'\a'
...
Senior Member
Posted in Uncategorized
Views 8500 Comments 0 Nominal Animal is offline
Old

Slacking with Slackware

Posted 12-01-2011 at 08:11 AM by ofaring (Debian, This That and the Other)
Updated 12-01-2011 at 08:14 AM by ofaring

Ok. I've used Debian for quite some time -- although I started with Slackware years back -- and it's been awhile since I attempted anything without a package manager!

I grabbed a copy of Slackware Disc 1 and installed a basic, console-only Slackware.

First snag...WiFi. I live in a busy neighbourhood full of students eager to grab "free" internet off a WEP-encrypted wireless router, so WPA is a must. Well, /etc/rc.d/rc.inet1.conf didn't seem very happy to play...
Member
Posted in Examples, Slackware
Views 1148 Comments 0 ofaring is offline
Old

Comment a block in shell

Posted 08-31-2011 at 12:22 AM by hi2arun
Tags bash, script

We all know, to comment out a line in shell script, '#' token is inserted in the line that needs to be made dead.
Eg:

Code:
# This is a dead line
echo "This line is live"
However, '#' token can be pesky if a block of lines need to be commented out.
Say, to comment out the following block using '#'

Code:
# comment starts here
# All these lines
# are blocked
# using '#' token
# ...
# ...
# ...
...
Member
Posted in Uncategorized
Views 984 Comments 0 hi2arun is offline
Old

"Wait until a process ends, a download ends, or a file conversion ends, then do X"

Posted 08-30-2011 at 03:06 PM by the dsc (linux-related notes)
Updated 08-30-2011 at 09:41 PM by the dsc (a small improvement)

Sometimes you want the computer to shut down after you've finished downloading something or converting some large file into some other format, but you want to go out or go to sleep instead of waiting and checking for it yourself.

For these situations I've come up with two tiny scripts. The first one waits until a file hasn't changed its size on three consecutive intervals of twenty seconds:

Code:
a=0 ; file="$1" ; if [ -f "$file.part" ] ; then file="$file.part"
...
Member
Posted in Uncategorized
Views 1033 Comments 0 the dsc is offline

  



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