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Top Forums Shell Programming and Scripting How to grep in order based on the input file Post 28783 by Kelam_Magnus on Tuesday 24th of September 2002 02:26:03 PM
Old 09-24-2002
Yes it works. I actually stumbled upon this a few months ago.

I once pondered why this was. I get the same output whether I use > or >> to write out the file if it is outside the loop.

I believe that it is because the "> file.3" is outside of the loop so ALL of the grepped data goes out together and is written ONCE and not each time the loop runs.

I believe that this is a little faster than writing each time the loop finishes, especially with 2 large files. I only had about 200 lines for file1, but file.2 had almost 1000 lines to be searched.

You would be right if I had put the > file.3 inside the loop, it would overwrite the file each time instead of appending as with >> file.3 would do.

So both of these are the same.

_________________________
for name in `cat file.1 `
do
grep $name file.2
done > file.3

_________________________
for name in `cat file.1 `
do
grep $name file.2 >> file.3
done
_________________________

Smilie Smilie
 

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voice_set_playmode(3alleg4)					  Allegro manual				       voice_set_playmode(3alleg4)

NAME
voice_set_playmode - Adjusts the loop status of the specified voice. Allegro game programming library. SYNOPSIS
#include <allegro.h> void voice_set_playmode(int voice, int playmode); DESCRIPTION
Adjusts the loop status of the specified voice. This can be done while the voice is playing, so you can start a sample in looped mode (hav- ing set the loop start and end positions to the appropriate values), and then clear the loop flag when you want to end the sound, which will cause it to continue past the loop end, play the subsequent part of the sample, and finish in the normal way. The mode parameter is a bitfield containing the following values: PLAYMODE_PLAY Plays the sample a single time. This is the default if you don't set the loop flag. PLAYMODE_LOOP Loops repeatedly through the sample, jumping back to the loop start position upon reaching the loop end. PLAYMODE_FORWARD Plays the sample from beginning to end. This is the default if you don't set the backward flag. PLAYMODE_BACKWARD Reverses the direction of the sample. If you combine this with the loop flag, the sample jumps to the loop end position upon reaching the loop start (ie. you do not need to reverse the loop start and end values when you play the sample in reverse). PLAYMODE_BIDIR When used in combination with the loop flag, causes the sample to change direction each time it reaches one of the loop points, so it alternates between playing forwards and in reverse. SEE ALSO
Allegro version 4.4.2 voice_set_playmode(3alleg4)
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