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Old 02-03-2007, 12:24 PM   #1
Benanzo
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Registered: Sep 2005
Location: Seattle
Distribution: Ubuntu, Debian flavors
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bash scripting help want to execute external function on current item.


Hello!

I am needing some help with writing a bash script.
I am currently in the process of revising a podcast management script I wrote to add some new functionality. The way I have it set up now is purely with variables and explicitly stating the commands in the body of the script. This is not exactly efficient because I have about 20 individual podcasts to manage. I am trying to split some of the routines out into functions. But instead of just blobbing it all into one long file I want to split the different steps into different scripts that only execute if called. This leads to me needing to run a function in a script on an item in a different script. For instance:

The first part of my script checks the download folders for fresh podcasts and lists them in a file for the rest of the scripts to find them easy:

Code:
#!/bin/bash
#
# Step 1
# Check raw_podcasts for new podcasts

READFILE="/home/ben/podcasts/readfile"

# check for new podcasts
function check_raw_podcasts
{
	for NEW_MP3 in $(find /home/ben/podcasts/raw_podcasts/*/*".mp3") ; do
		echo ${NEW_MP3} >> ${READFILE}
	done

	for NEW_M4A in $(find /home/ben/podcasts/raw_podcasts/*/*".m4a") ; do
		echo ${NEW_M4A} >> ${READFILE}
	done
}
$(check_raw_podcasts)
After the readfile has been populated with new podcasts, step 2 of my script checks the readfile and runs the appropriate functions specific to which podcasts are in the list.

Code:
#!/bin/bash
#
# Step 2
# Check the readfile for new podcasts to work on
READFILE="/home/ben/podcasts/readfile"
BUZZ_DIR="/home/ben/podcasts/raw_podcasts/buzz_out_loud"
ENGADGET_DIR="/home/ben/podcasts/raw_podcasts/engadget"
MACOSKEN_DIR="/home/ben/podcasts/raw_podcasts/macosken"

function check_readfile
{
	for PODCAST in $(cat ${READFILE} | grep "$BUZZ_DIR") ; do
		$(buzz_out_loud)
	done

	for PODCAST in $(cat ${READFILE} | grep "$ENGADGET_DIR") ; do
		$(engadget)
	done

	for PODCAST in $(cat ${READFILE} | grep "$MACOSKEN_DIR") ; do
		$(macosken)
	done
}
$(check_readfile)
I want the functions listed in Step 2 $(buzz_out_loud) $(engadget) etc. to be available from a separate script.

I've been scouring for a little bit and I've noticed that sometimes people put something like

Code:
import ../scripts/functions.sh
or something similar at the beginning of a script. Is that basically what I'm looking for? I'm having a little trouble sorting this out. Thanks for your help!

ben
 
Old 02-03-2007, 02:13 PM   #2
macemoneta
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Registered: Jan 2005
Location: Manalapan, NJ
Distribution: Fedora x86 and x86_64, Debian PPC and ARM, Android
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Yes, however in bash the syntax is:

. /somedir/somescript

(Note the the line starts with period-space). This applies the commands in the external file to the environment of the currently running shell.
 
Old 02-03-2007, 03:33 PM   #3
Benanzo
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Registered: Sep 2005
Location: Seattle
Distribution: Ubuntu, Debian flavors
Posts: 119

Original Poster
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Wonderful, now my next question...

That worked great, thanks!

Also, I have another tidbit that I can't seem to find.

How do I make text appear at the top of a page instead of the bottom like it does with cat?

I want to make an HTML log file with a bash script but I want the newest info to be at the top of the page and not way down at the bottom.

For instance, I have several pre-formatted HTML tables that I want to be able to insert in the body of my HTMl page before the oldest ones, not after.
 
Old 02-03-2007, 03:45 PM   #4
macemoneta
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If you want to reverse the output of a file, use the 'tac' command instead of 'cat'.
 
  


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