Bash script doesn't allow variables to be created/used

Question

I'm at a loss at the moment with a problem regarding my bash script trying to convert midi input into key strokes using xdotool.

#!/bin/bash
aseqdump -p "USB MIDI cable" | \
while IFS=" ," read src ev1 ev2 ch label1 data1 label2 data2 rest; do
    case "$ev1 $ev2 $data1" in
        "Note on 48" ) if[$octave=0] 
                         then 
                           xdotool key 9; octave=1 
                       elif[$octave=1] 
                         then xdotool key 1 
                       else 
                           xdotool key 0; octave=1 
                       fi ;;
        "Note on 36" ) xdotool key 9; octave=0 ;;
esac

done

for my problem: If I understand creating variables correctly, then pressing the key responsible for "Note 36" should set octave to 0 though the if statement on "Note 48" doesn't recognize it. in Addition even using a simpler

if[$octave=1] then xdotool key 1 fi ;;

Does not work with the variable provided.

sooo in the end what the script is supposed to do is convert midi input from a device to keystrokes though depending on the keys pressed beforehand the same key is supposed to output different keystrokes.

Additional Information

I am currently running on Ubuntu 22.04
The Keys are so far read and translated correctly, only the variable creates issues

Multiple issues with your script. Try running it through shellcheck first and then coming back with any additional questions. — doneal24, Jun 15 '22 at 17:11
if[$octave=0] should give you an error. Something like if[0=0]: command not found, depending on the value of the variable — ilkkachu, Jun 15 '22 at 17:33
also see Why is my variable local in one 'while read' loop, but not in another seemingly similar loop? (or In bash, read after a pipe is not setting values) — ilkkachu, Jun 15 '22 at 17:34
@ilkkachu Without the whitespace between if and [, you should get an unexpected token error. — doneal24, Jun 15 '22 at 17:44

Bash script doesn't allow variables to be created/used

0 Answers0