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Top Forums Shell Programming and Scripting Multiple FOR;Singe DO statement Post 302955237 by Scrutinizer on Tuesday 15th of September 2015 04:16:23 PM
Old 09-15-2015
You can also make the redirection local to the while loop :

Code:
while IFS= read -r line1 && IFS= read -r line2<&3
do 
  printf "%s\n" "\$line1: $line1" "\$line2: $line2" 
done <file1 3<file2

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cam(1)                                                        General Commands Manual                                                       cam(1)

NAME
cam - CPU'S AUDIO MIXER for Linux SYNOPSIS
cam [-v x,y] [--volume x,y] [-b x,y] [--bass x,y] [-t x,y] [--treble x,y] [-s x,y] [--synth x,y] [-p x,y] [--pcm x,y] [-S x,y] [--speaker x,y] [-l x,y] [--line x,y] [-m x,y] [--mic x,y] [-c x,y] [--cd x,y] [-M x,y] [--mixer x,y] [-a x,y] [--altpcm x,y] [-r x,y] [--reclev x,y] [-i x,y] [--igain x,y] [-o x,y] [--ogain x,y] [-l1 x,y] [--line1 x,y] [-l2 x,y] [--line2 x,y] [-l3 x,y] [--line3 x,y] [-3d 1|0] [--3dse 1|0] [-agc 1|0] [--agc 1|0] [-h] [-?] [--help] [-get] [-save] [-getfile filename] [-savefile filename] xcam DESCRIPTION
This is an audio mixer for Linux. You have the choice to use it with an interface or at the command line. OPTIONS
When using the interface you can use the following keys : LEFT ARROW decrease the volume of the current device. RIGHT ARROW increase the volume of the current device. UP ARROW go to previous device. DOWN ARROW go to next device. L locks or unlocks : unlocked : you can control the left and right channel separately. lock : left and right channel are controlled together. R turn on/off recording mode : red lamp : recording turned on green lamp : recording turned off 3 turn on/off 3D Stereo Enhancement (3DSE) device : when turned on green indicator 3D will be lit at the left side of main volume handle. A turn on/off microphone Automatic Gain Control : when turned on green indicator AGC will be lit at the left side of microphone volume handle. S save the settings of ALL devices in a file ($HOME/.camrc) G loads the saved settings and restores them. H shows the help screen. Q/ESC exits the program and returns to shell. NOTE: you can use upper or lower case. When using the command line options the interface is not shown. The following options are available : -v, --volume x,y Set 'volume' to x (left) and y (right) -b, --bass x,y Set 'bass' to x (left) and y (right) -t, --trebble x,y Set 'treble' to x (left) and y (right) -s, --synth x,y Set 'synth' to x (left) and y (right) -p, --pcm x,y Set 'pcm' to x (left) and y (right) -S, --speaker x,y Set 'speaker' to x (left) and y (right) -l, --line x,y Set 'line in' to x (left) and y (right) -m, --mic x,y Set 'microphone' to x (left) and y (right) -c, --cd x,y Set 'CD in' to x (left) and y (right) -I, --imix x,y Set 'mixer' to x (left) and y (right) -a, --altpcm x,y Set 'altpcm' to x (left) and y (right) -r, --reclev x,y Set 'record level' to x (left) and y (right) -i, --igain x,y Set 'input gain' to x (left) and y (right) -o, --ogain x,y Set 'output gain' to x (left) and y (right) -l1, --line1 x,y Set 'line 1' to x (left) and y (right) -l2, --line2 x,y Set 'line 2' to x (left) and y (right) -l3, --line3 x,y Set 'line 3' to x (left) and y (right) -3d, --3dse 1|0 Set 3D Stereo Enhancement to 1 (on) or 0 (off) -agc, --agc 1|0 Set Automatic Gain Control for microphone to 1 (on) or 0 (off) -get restore the saved values from $HOME/.camrc -save save the values to $HOME/.camrc -getfile filename restore the saved values from file 'filename' -savefile filename save the values to file 'filename' -h, -?, --help displays help NOTE: x and y are in range from 1 to 100. Higher or lower numbers are ignored. BUGS
None known as yet. If you find one, please let me know. AUTHOR
Jan 'TWP' VANDENBERGHE <jvdbergh@uia.ua.ac.be> cam(1)
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